CN211184229U - Circuit for switching TPA3255 series power amplifier IC multifunctional output - Google Patents
Circuit for switching TPA3255 series power amplifier IC multifunctional output Download PDFInfo
- Publication number
- CN211184229U CN211184229U CN202020257215.2U CN202020257215U CN211184229U CN 211184229 U CN211184229 U CN 211184229U CN 202020257215 U CN202020257215 U CN 202020257215U CN 211184229 U CN211184229 U CN 211184229U
- Authority
- CN
- China
- Prior art keywords
- output
- frequency
- pin
- power amplifier
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005236 sound signal Effects 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 32
- 230000003321 amplification Effects 0.000 claims description 47
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 47
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000007781 pre-processing Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012827 research and development Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- QVZZPLDJERFENQ-NKTUOASPSA-N bassianolide Chemical compound CC(C)C[C@@H]1N(C)C(=O)[C@@H](C(C)C)OC(=O)[C@H](CC(C)C)N(C)C(=O)[C@@H](C(C)C)OC(=O)[C@H](CC(C)C)N(C)C(=O)[C@@H](C(C)C)OC(=O)[C@H](CC(C)C)N(C)C(=O)[C@@H](C(C)C)OC1=O QVZZPLDJERFENQ-NKTUOASPSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012905 input function Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a circuit to multi-functional output of TPA3255 series power amplifier IC switches belongs to audio amplifier circuit field. The utility model discloses a leading processing circuit and power amplifier circuit, power amplifier circuit's output links to each other with loudspeaker, wherein, leading processing circuit includes the signal input module that links to each other with incoming signal, the DRC control module that links to each other with the signal input module output, respectively with the leading frequency division module of first leading frequency division module and the leading frequency division module of second that DRC control module output links to each other still includes audio signal change over switch, power amplifier circuit includes output processing module, the power amplifier IC who links to each other with output processing module output, still includes the multi-functional output condition setting module that links to each other with power amplifier IC's MI pin and M2 pin input. The utility model discloses can compatible TPA3255 series power amplifier IC.
Description
Technical Field
The utility model relates to a speaker circuit especially relates to a circuit to the multi-functional output of TPA3255 series power amplifier Ic switches.
Background
US TI TPA 3245C L ASS D series power amplifier IC contains models such as TPA3245/TPA3251/TPA3255, when stereo set or audio circuit design, meet different power amplifier IC product requirements and can do the same corresponding circuit development design as required, if the same series model still can consider using same stereo set circuit, but if will use different audio circuit and power amplifier when the model of different series, can cause research and development cost for the company like this, purchase cost, various costs such as manufacturing cost rise by a wide margin.
SUMMERY OF THE UTILITY MODEL
For solving the problem among the prior art, the utility model provides a circuit to the multi-functional output of TPA3255 series power amplifier Ic switches.
The utility model discloses a pre-processing circuit and power amplifier circuit, power amplifier circuit's output links to each other with loudspeaker, wherein, pre-processing circuit includes the signal input module who links to each other with input signal, the DRC control module who links to each other with signal input module output, first pre-frequency division module and the second pre-frequency division module that link to each other with DRC control module output respectively, still include audio signal change over switch, the select terminal that audio signal switches over links to each other with the output of first pre-frequency division module and the output of second pre-frequency division module respectively, audio signal change over switch's normal termination power amplifier circuit input;
the power amplifying circuit comprises an output processing module, a power amplifier Ic connected with the output end of the output processing module, and a multifunctional output condition setting module connected with the MI pin of the power amplifier Ic and the input end of the M2 pin.
The utility model discloses make further improvement, first leading frequency division module is used for exporting the PRE AUDIO AUDIO signal who has handled through digital DSP simulation effect, the leading frequency division module of second is used for exporting not handling, pass band be horizontal AUDIO signal's F L AT AUDIO AUDIO signal.
The utility model discloses do further improvement, first leading frequency division module includes three routes frequency division branch road, and the frequency amplification unit who links to each other with three routes frequency division branch road output respectively, and three routes frequency division branch road is used for cutting apart the frequency signal of input into high frequency, intermediate frequency and low frequency section respectively, the frequency division branch road includes the BY PASS circuit of more than one series connection, the BY PASS circuit comprises the two-step high PASS circuit and the two-step low PASS circuit that concatenate.
The utility model is further improved, the frequency amplification unit comprises a power amplifier U207, the power amplifier U207 is composed of a power amplifier U207A and a power amplifier U207B, wherein,
the positive phase input end of the power amplification unit U207A is grounded, the negative phase input end is respectively connected with the output ends of the low-frequency division branch and the intermediate-frequency division branch, or the output ends of the three frequency division branches, and is connected with the output end of the power amplification unit U207A through a capacitor C260 and a resistor R259 which are connected in parallel, the output end of the power amplification unit U207A outputs a low-and-medium-frequency PRE AUDIO amplification signal through the capacitor C259, the positive power pin of the power amplification unit U207A is respectively connected with a grounding capacitor C258 and a plus 15V power resistor R258, and the negative power pin of the power amplification unit U207A is respectively grounded through a capacitor C263 and connected with a-15;
the non-inverting input end of the power amplification unit U207B is grounded, the inverting input end is connected with the high-frequency division branch, and is connected with the output end of the power amplification unit U207B through a capacitor C265 and a resistor R263 which are connected in parallel, and the output end of the power amplification unit U207B outputs a high-frequency PRE AUDIO amplification signal through a capacitor C264.
The utility model discloses do further improvement, the leading frequency division module of second includes first frequency division branch road and second frequency division branch road, wherein, the F L AT AUDIO AUDIO signal of low frequency in the first frequency division branch road output, the F L AT AUDIO AUDIO signal of second frequency division branch road output high frequency.
In a further improvement of the present invention, the audio signal switch comprises switches SW2-A and SW2-B,
two selection ends of the switch SW2-A are respectively connected with the output end of the middle and low frequency F L AT AUDIO signal and the output end of the middle and low frequency PRE AUDIO amplification signal, the normally connected end of the switch SW2-A outputs the middle and low frequency signals L PF & CH1,
two selection ends of the switch SW2-B are respectively connected with a high-frequency F L AT AUDIO signal output end and a high-frequency PREAUDIO AUDIO amplification signal output end, and a normally-connected end of the switch SW2-B outputs a high-frequency signal HPF & CH 2.
The utility model discloses make further improvement, switch SW 2-A's normal termination and switch SW 2-B's normal termination still are equipped with resistance R154.
The utility model is further improved in that the output processing module converts the middle and low frequency signals and the high frequency signals output by the pre-processing circuit into six paths of signals which are respectively connected with 4 input pins of a power amplifier chip U302,
the INPUT end of the first path of signal INPUT _ A is connected with the normally connected end of the switch SW2-B, and the output end of the first path of signal INPUT _ A is connected with a signal INPUT pin 5INPUT _ A pin of the power amplifier chip U302;
the INPUT end of the sixth signal INPUT _ a is connected with the normal end of the switch SW2-a, and the output end is connected with the signal INPUT pin 16INPUT _ C pin of the power amplifier chip U302;
the output processing module comprises a high-frequency signal processing unit and a middle-low frequency signal processing unit, wherein the high-frequency signal processing unit comprises an operational amplifier U301A, a pin 2 of the U301A is connected with a normally-connected end of a switch SW2-B through a resistor R301 and is connected with an output pin 1 of the operational amplifier U301A through a capacitor C303 and a resistor R303 which are connected in parallel, a pin 3 of the operational amplifier U301A is grounded, a pin 8 is connected with a positive electrode of a power supply, a pin 4 is connected with a negative electrode of the power supply, the output pin 1 outputs a second path signal INPUT _ BB through a capacitor C381, a third path signal INPUT _ B is output through the capacitor C301, and output ends of the second path signal INPUT _ BB and the third path signal INPUT _ B are respectively connected with a signal INPUT pin 6INPUT _ B pin of;
the middle and low frequency signal processing unit comprises an operational amplifier U301B, wherein a pin 5 of the U301B is grounded, a pin 6 is connected with a normally connected end of a switch SW2-A through a resistor R302 and is connected with an output pin 7 of the operational amplifier U301B through a capacitor C304 and a resistor R304 which are connected in parallel, the output pin 7 outputs a fourth signal INPUT _ D through the capacitor C302 and outputs a fourth signal INPUT _ DD through a capacitor C382, and output ends of the fourth signal INPUT _ D and the fifth signal INPUT _ DD are respectively connected with a signal INPUT pin 17INPUT _ D pin of a power amplifier chip U302.
The utility model discloses make further improvement, multi-functional output condition sets up the module and includes resistance R376-R379, wherein, resistance R376 and resistance R377's one end link to each other with power amplifier chip U302's pin 3M 1pin respectively, and resistance R378 and resistance R379's one end links to each other with power amplifier chip U302's pin 4M2 pin respectively, and resistance R376 and resistance R378's other end ground connection, resistance R377 and resistance R379's the other end link to each other with power amplifier chip U302's pin 11DVDD pin respectively.
The utility model discloses do further improvement, multi-functional output condition sets up the module and still includes resistance R360 and resistance R351, wherein, resistance R360's an end connects power amplifier chip U302's signal INPUT pin 16INPUT _ c pin, resistance R351's an end connects power amplifier chip U302's signal INPUT pin 17INPUT _ D pin, resistance R360 and resistance R351's the other end ground connection respectively.
Compared with the prior art, the utility model has the advantages that the compatible TPA3255 series power amplifier IC of same kind of circuit only needs to adjust supply voltage, and the power amplifier chip is TPA3245, TPA3251, TPA3255X series C L ASS D series power amplifier IC can directly replace, greatly reduced company's research and development cost and manufacturing cost.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic diagram of a pre-processing circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a first pre-divider module;
FIG. 4 is a schematic diagram of a second frequency-dividing module circuit and an audio signal switch circuit;
fig. 5 is a schematic diagram of a power amplification circuit according to an embodiment of the present invention;
FIG. 6 is a circuit schematic of an output processing module;
FIG. 7 is a partial enlarged view of a power amplifier chip IC;
FIG. 8 is a schematic diagram of a single-channel output circuit of a power amplifier chip IC;
FIG. 9 is a schematic diagram of two-channel output single-channel of a power amplifier chip IC;
FIG. 10 is a schematic diagram of a single channel output of a power amplifier chip IC 2.1 channel;
fig. 11 is a schematic diagram of a power amplifier chip Ic 4 channel output single channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention includes a pre-processing circuit and a power amplifying circuit, the output end of the power amplifying circuit is connected to a speaker, wherein the pre-processing circuit includes a signal input module connected to an input signal, a DRC (dynamic range control) control module connected to the output end of the signal input module, a first pre-frequency dividing module and a second pre-frequency dividing module respectively connected to the output end of the DRC control module, and further includes an audio signal switch, the selection end of the audio signal switch is connected to the output end of the first pre-frequency dividing module and the output end of the second pre-frequency dividing module respectively, and the normal connection of the audio signal switch is connected to the input end of the power amplifying circuit;
the power amplifying circuit comprises an output processing module, a power amplifier Ic connected with the output end of the output processing module, and a multifunctional output condition setting module connected with the MI pin of the power amplifier Ic and the input end of the M2 pin.
The utility model discloses the pre-processing circuit mainly is that the function is pre-processing, can realize electron frequency division, DRC control etc. can realize different input needs and technical requirement through the parameter adjustment of difference.
The utility model discloses power amplification circuit mainly is that the function is power amplification and handles, realizes input/output MODE control etc. through MODE PIN M1& M2 high-low level control, can realize different input needs and technical requirement through the parameter adjustment of difference.
The utility model discloses the circuit is just under the condition of jumping out traditional cognition, adopts the electronic frequency division technique that the applicant originally created, simulation DRC control technique, mode control technique, the same Ic that develops reaches multi-functional output circuit the applicant uses on developing GZV4A/GZV4D/GZV4D/GZV8D etc. network audio frequency power amplifiers and other active power amplifiers of different grade type, for example CS08A, various acoustic circuits such as TYPON-AX 8-MBT the utility model discloses the circuit, the power amplifier chip that the utility model discloses the circuit used is TPA3245 of American TI company, TPA3251, TPA3255X series C L ASS D class series power amplifiers IC can directly be replaced, only need adjust supply voltage already, the compatibility is strong, greatly reduced company's research and development cost and manufacturing cost.
As shown in fig. 2-4, the first PRE-crossover module of this embodiment is used to output PRE AUDIO signal processed by digital DSP analog effect, and the second PRE-crossover module is used to output unprocessed F L AT AUDIO signal with horizontal frequency band.
As shown in fig. 3, the first pre-frequency division module includes three frequency division branches and frequency amplification units respectively connected to output ends of the three frequency division branches, the three frequency division branches are respectively used for dividing an input frequency signal into high frequency, intermediate frequency and low frequency bands, the frequency division branch includes more than one BY PASS circuit connected in series, and the BY PASS circuit includes a two-step high-PASS circuit and a two-step low-PASS circuit connected in series.
The frequency amplification unit of the embodiment comprises a power amplifier U207, wherein the power amplifier U207 comprises a power amplifier unit U207A and a power amplifier unit U207B, wherein,
the positive phase input end of the power amplification unit U207A is grounded, the negative phase input end is respectively connected with the output ends of the low-frequency division branch and the intermediate-frequency division branch, or the output ends of the three frequency division branches, and is connected with the output end of the power amplification unit U207A through a capacitor C260 and a resistor R259 which are connected in parallel, the output end of the power amplification unit U207A outputs a low-and-medium-frequency PRE AUDIO amplification signal through the capacitor C259, the positive power pin of the power amplification unit U207A is respectively connected with a grounding capacitor C258 and a plus 15V power resistor R258, and the negative power pin of the power amplification unit U207A is respectively grounded through a capacitor C263 and connected with a-15;
the non-inverting input end of the power amplification unit U207B is grounded, the inverting input end is connected with the high-frequency division branch, and is connected with the output end of the power amplification unit U207B through a capacitor C265 and a resistor R263 which are connected in parallel, and the output end of the power amplification unit U207B outputs a high-frequency PRE AUDIO amplification signal through a capacitor C264.
The circuit is implemented on the basis of a traditional mature operational amplifier, multi-section analog electronic frequency division design is adopted, the EQ control, the Q value control, the HI PASS, the L TtT translation = L &L &lTt/T &gTtO PASS, the BY PASS, DRC, ANC control, sound effect control and other functions which are the same as those of a digital DSP are achieved, and the analog effect of the digital DSP is achieved.
The following specific analysis was performed:
the U204A unit forms a dual PASS high PASS circuit, the specific low frequency cutoff frequency F1 is 32.9Hz, i.e. attenuation of frequencies below 32.9Hz BY-12 db per frequency multiplication, the U241/C242/R241/R242 unit is changed to allow the cutoff frequency of F1 to infinitely approach the 20Hz low frequency AUDIO frequency, and lower frequency extension is continued, while the U204B unit forms a dual PASS low PASS circuit, the transition frequency F2 is 129.24 Hz., i.e. attenuation of frequencies above 129.24Hz BY-12 db per frequency multiplication, the U204/R245/C244/C245 unit is changed to allow the high PASS frequency 129.24Hz to continue upward or downward BY changing the parameters of R244/R245/C244/C245, the U204A and U204B unit form a BY BASS band PASS circuit of 32.9Hz to 129.24Hz, the U204U B and U204U B unit are changed to form a dual PASS AUDIO frequency amplification circuit, the TPA U204/U204U 48 and U204U 8, the AUDIO frequency processed BY a TPA 35/U60 Hz, the TPA 48 and U204U 8, the TPA 35/V26U 160 and U204U 35/V35V 26U 160U 8 and U35/V35V 25V 7V 35V 25V 7V 35V 8V 25V 8V 2V 8V 2.
As shown in fig. 3, the second prescaler module of this embodiment includes a first frequency-dividing branch and a second frequency-dividing branch, wherein the first frequency-dividing branch outputs a low-frequency F L AT AUDIO signal, and the second frequency-dividing branch outputs a high-frequency F L AT AUDIO signal.
The audio signal switching switch of this example includes switches SW2-a and SW2-B, wherein,
two selection ends of the switch SW2-A are respectively connected with the output end of the middle and low frequency F L AT AUDIO signal and the output end of the middle and low frequency PRE AUDIO amplification signal, the normally connected end of the switch SW2-A outputs the middle and low frequency signals L PF & CH1,
two selection ends of the switch SW2-B are respectively connected with a high-frequency F L AT AUDIO signal output end and a high-frequency PREAUDIO AUDIO amplification signal output end, and a normally-connected end of the switch SW2-B outputs a high-frequency signal HPF & CH 2.
Preferably, the normally connected end of the switch SW2-A and the normally connected end of the switch SW2-B are further provided with a resistor R154.
As shown in fig. 5 and fig. 6, the output processing module converts the low-medium frequency signal and the high-frequency signal output by the pre-processing circuit into six paths of signals, which are respectively connected to 4 input pins of the power amplifier chip U302, wherein,
the INPUT end of the first path of signal INPUT _ A is connected with the normally connected end of the switch SW2-B, and the output end of the first path of signal INPUT _ A is connected with a signal INPUT pin 5INPUT _ A pin of the power amplifier chip U302;
the INPUT end of the sixth signal INPUT _ a is connected with the normal end of the switch SW2-a, and the output end is connected with the signal INPUT pin 16INPUT _ C pin of the power amplifier chip U302;
the output processing module comprises a high-frequency signal processing unit and a middle-low frequency signal processing unit, wherein the high-frequency signal processing unit comprises an operational amplifier U301A, a pin 2 of the U301A is connected with a normally-connected end of a switch SW2-B through a resistor R301 and is connected with an output pin 1 of the operational amplifier U301A through a capacitor C303 and a resistor R303 which are connected in parallel, a pin 3 of the operational amplifier U301A is grounded, a pin 8 is connected with a positive electrode of a power supply, a pin 4 is connected with a negative electrode of the power supply, the output pin 1 outputs a second path signal INPUT _ BB through a capacitor C381, a third path signal INPUT _ B is output through the capacitor C301, and output ends of the second path signal INPUT _ BB and the third path signal INPUT _ B are respectively connected with a signal INPUT pin 6INPUT _ B pin of;
the middle and low frequency signal processing unit comprises an operational amplifier U301B, wherein a pin 5 of the U301B is grounded, a pin 6 is connected with a normally connected end of a switch SW2-A through a resistor R302 and is connected with an output pin 7 of the operational amplifier U301B through a capacitor C304 and a resistor R304 which are connected in parallel, the output pin 7 outputs a fourth signal INPUT _ D through the capacitor C302 and outputs a fourth signal INPUT _ DD through a capacitor C382, and output ends of the fourth signal INPUT _ D and the fifth signal INPUT _ DD are respectively connected with a signal INPUT pin 17INPUT _ D pin of a power amplifier chip U302.
The working principle of the output processing module is explained in detail as follows:
the power amplifier chip may be connected to a full frequency loudspeaker 206 via a full frequency loudspeaker 206, and may be connected to a full frequency loudspeaker 206 via a power amplifier chip 58, a full frequency loudspeaker 206 via a power amplifier unit 206 via a U204 (L F) + 205U (MF) to form a low frequency output, via a U A to form a low frequency output, via a power amplifier unit 206, via a full frequency loudspeaker 539 to form a full frequency loudspeaker 206, via a full frequency loudspeaker 539 to connect a full frequency loudspeaker 206 via a full frequency loudspeaker 206, via a full frequency loudspeaker 206.
The operational amplifier U208A performs middle and low frequency division, Q is-6 db, cutoff frequency is determined by C269 and (R269+ internal resistance), corner frequency is determined by R270/C270, gain is determined by R270/R269, and DRC function can also be handled. The high-pass low-frequency cut-off frequency in the circuit is formed by the following ranges: regulating within 20 Hz-3 KHz. U208B performs high frequency division with Q value of-6 db, cutoff frequency determined by C259 and (R271+ internal resistance), breakover frequency determined by R273/C275, gain determined by R273/R271, high pass low frequency cutoff frequency determined by the range: 3 KHz-20 KHz, at which time U208A & B will form an unprocessed, theoretically horizontally linear, full audio signal. While U208A and U208B divide the medium and high frequency electronically. If C270 of U208A is changed to 47P-100P, the whole passband of U208A will be changed to 20 Hz-20 KHz full-band audio signal. Meanwhile, the C259 of the U208B is changed into the 4.7U/16V integral passband, and the integral passband is changed into a full-band audio signal of 20Hz to 20 KHz.
Through the above analysis, the present invention can switch between the AUDIO signal processed BY the AUDIO signal switch SW2 and the AUDIO signal processed BY the U207A & B, that is, through the related multi-stage analog electronic frequency division design, the same EQ control, Q value control, HI PASS, <tttranslation = L "&tttl <tt/t gttt 0 PASS, BY PASS, DRC, ANC control, sound effect control, etc. are obtained, and the PRE AUDIO signal processed BY the analog effect of the digital DSP and the F L AT AUDIO signal which is not processed and theoretically has a horizontal AUDIO signal are switched, the F L AT AUDIO signal is processed BY the U208A & B two units, and the full channel AUDIO signal output of the two channels is realized BY adjusting the peripheral difference number of the U208A & B units, and the full channel power amplifier outputs the full channel power amplifier from the U85 208A & B unit to the full channel series TPA 32.
As shown in fig. 5 and 7, in this example, a multifunctional output condition setting module is disposed at the M1 pin and the M2 pin of the power amplifier chip U302, and includes resistors R376 to R379, wherein one ends of the resistor R376 and the resistor R377 are respectively connected to the pin 3M1 of the power amplifier chip U302, one ends of the resistor R378 and the resistor R379 are respectively connected to the pin 4M2 of the power amplifier chip U302, the other ends of the resistor R376 and the resistor R378 are grounded, and the other ends of the resistor R377 and the resistor R379 are respectively connected to the pin 11DVDD of the power amplifier chip U302.
The multifunctional output condition setting module further comprises a resistor R360 and a resistor R351, wherein one end of the resistor R360 is connected with a signal INPUT pin 16INPUT _ c pin of the power amplifier chip U302, one end of the resistor R351 is connected with a signal INPUT pin 17INPUT _ D pin of the power amplifier chip U302, and the other ends of the resistor R360 and the resistor R351 are respectively grounded.
As shown in fig. 8-11, in this embodiment, the PIN port is controlled by changing the power amplifier chip TPA3245/TPA3251/TPA3255 related modes: the INPUT functions of the M1 pin, the M2 pin and the INPUT INPUT _ A/INPUT _ B/INPUT _ C/INPUT _ D are as follows: a.1 channel full or subwoofer output. And B.2 channel output. And C.2.1 channel output. And D.4 channel output.
The working principle of the method is explained in detail as follows:
a: single channel
As shown in FIG. 8, M2 is set high by resistor R379 connected to 11PIN/R378NC, and R377NC/R376 is connected to ground. The INPUT _ c/INPUT _ D INPUTs are disconnected, and the 16PIN/17PIN is grounded through R360/R351. Thus, the setting of the output condition of the single-channel power amplifier is completed. Differential signals are INPUT through INPUT _ a and INPUT _ B. Namely, the low-frequency differential audio signal can be connected, and the full-frequency single-channel differential audio signal can also be connected. The power amplifier chip TPA3245/TPA3251/TPA3255 outputs related single-channel power audio.
B.2 channel output
As shown in FIG. 9, the resistors R377/R379NC, R378/R376 are grounded, and R360/R351NC is used for enabling/MI// M2 to be set low, so that the condition setting of the dual-channel power amplifier output is completed.
C.2.1 channel output
As shown in fig. 10, two-channel non-differential audio signals are INPUT, and differential low-frequency signals are INPUT through INPUT _ a and INPUT _ B. Thus, the 2.1 channel power amplifier output condition setting is completed. The power amplifier chip TPA3245/TPA3251/TPA3255 outputs related 2.1 power audio.
D.4 channel output
As shown in FIG. 11, the resistor R378/R376NC, R377/R379 connected to 11PIN, makes M1/M2 high. The non-differential audio signal is INPUT through R360/R351NC and INPUT _ B/INPUT _ BB/INPUT _ D and INPUT _ DD. Thus, the 4-channel power amplifier output condition setting is completed. Power amplifier chip TPA3245/TPA3251/TPA3255 outputs related 4-way power audio
From the above analysis, it can be seen that: the utility model discloses a do relevant leading processing to leading circuit, can realize electron frequency division, processing such as DRC control to switch to the multi-functional output mode of TPA3255 series power amplifier Ic and handle, reach the beneficial effect of many commutations of power output, thereby make the utility model discloses a compatible TPA3255 series power amplifier IC of same kind of circuit, the research and development cost and the manufacturing cost of greatly reduced company.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.
Claims (10)
1. The circuit for switching the TPA3255 series power amplifier IC multifunctional output is characterized in that: the system comprises a pre-processing circuit and a power amplifying circuit, wherein the output end of the power amplifying circuit is connected with a loudspeaker, the pre-processing circuit comprises a signal input module connected with an input signal, a DRC control module connected with the output end of the signal input module, a first pre-frequency dividing module and a second pre-frequency dividing module which are respectively connected with the output end of the DRC control module, and an audio signal switch, the selection end of the audio signal switch is respectively connected with the output end of the first pre-frequency dividing module and the output end of the second pre-frequency dividing module, and the normally-connected end of the audio signal switch is connected with the input end of the power amplifying circuit;
the power amplification circuit comprises an output processing module, a power amplifier IC connected with the output end of the output processing module, and a multifunctional output condition setting module connected with the MI pin of the power amplifier IC and the input end of the M2 pin.
2. The circuit of claim 1, wherein the first PRE-divide module is used to output PRE AUDIO signals processed by digital DSP analog effect, and the second PRE-divide module is used to output F L AT AUDIO signals without processed AUDIO signals with horizontal frequency band.
3. The circuit for the switching of the TPA3255 series power amplifier IC multifunctional output according to claim 2, wherein: the first preposed frequency division module comprises three frequency division branches and frequency amplification units respectively connected with output ends of the three frequency division branches, the three frequency division branches are respectively used for dividing input frequency signals into high-frequency, medium-frequency and low-frequency sections, each frequency division branch comprises more than one series-connected BY PASS circuit, and each BY PASS circuit is composed of a two-step high-PASS circuit and a two-step low-PASS circuit which are connected in series.
4. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 3, wherein: the frequency amplification unit comprises a power amplifier U207, the power amplifier U207 comprises a power amplifier unit U207A and a power amplifier unit U207B, wherein,
the positive phase input end of the power amplification unit U207A is grounded, the negative phase input end is respectively connected with the output ends of the low-frequency division branch and the intermediate-frequency division branch, or the output ends of the three frequency division branches, and is connected with the output end of the power amplification unit U207A through a capacitor C260 and a resistor R259 which are connected in parallel, the output end of the power amplification unit U207A outputs a low-and-medium-frequency PRE AUDIO amplification signal through the capacitor C259, the positive power pin of the power amplification unit U207A is respectively connected with a grounding capacitor C258 and a plus 15V power resistor R258, and the negative power pin of the power amplification unit U207A is respectively grounded through a capacitor C263 and connected with a-15;
the non-inverting input end of the power amplification unit U207B is grounded, the inverting input end is connected with the high-frequency division branch, and is connected with the output end of the power amplification unit U207B through a capacitor C265 and a resistor R263 which are connected in parallel, and the output end of the power amplification unit U207B outputs a high-frequency PRE AUDIO amplification signal through a capacitor C264.
5. The circuit for switching the multi-functional output of the TPA3255 series power amplifier IC of claim 4, wherein the second pre-frequency-division module comprises a first frequency-division branch and a second frequency-division branch, wherein the first frequency-division branch outputs a middle-low frequency F L AT AUDIO AUDIO signal, and the second frequency-division branch outputs a high frequency F L AT AUDIO AUDIO signal.
6. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 5, wherein: the audio signal switching switch includes switches SW2-a and SW2-B, wherein,
two selection ends of the switch SW2-A are respectively connected with a middle and low frequency F L ATAUDIO audio signal output end and a middle and low frequency PREAUDIO audio amplification signal output end, a normally connected end of the switch SW2-A outputs middle and low frequency signals,
two selection ends of the switch SW2-B are respectively connected with the high-frequency F L AT AUDIO signal output end and the high-frequency PREAUDIO AUDIO amplification signal output end, and the normally-connected end of the switch SW2-B outputs a high-frequency signal.
7. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 6, wherein: and a resistor R154 is also arranged at the normally connected end of the switch SW2-A and the normally connected end of the switch SW 2-B.
8. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 7, wherein: the output processing module converts the medium-low frequency signal and the high-frequency signal output by the pre-processing circuit into six paths of signals which are respectively connected with 4 input pins of a power amplifier chip U302, wherein,
the INPUT end of the first path of signal INPUT _ A is connected with the normally connected end of the switch SW2-B, and the output end of the first path of signal INPUT _ A is connected with a signal INPUT pin 5INPUT _ A pin of the power amplifier chip U302;
the INPUT end of the sixth signal INPUT _ a is connected with the normal end of the switch SW2-a, and the output end is connected with the signal INPUT pin 16INPUT _ C pin of the power amplifier chip U302;
the output processing module comprises a high-frequency signal processing unit and a middle-low frequency signal processing unit, wherein the high-frequency signal processing unit comprises an operational amplifier U301A, a pin 2 of the U301A is connected with a normally-connected end of a switch SW2-B through a resistor R301 and is connected with an output pin 1 of the operational amplifier U301A through a capacitor C303 and a resistor R303 which are connected in parallel, a pin 3 of the operational amplifier U301A is grounded, a pin 8 is connected with a positive electrode of a power supply, a pin 4 is connected with a negative electrode of the power supply, the output pin 1 outputs a second path signal INPUT _ BB through a capacitor C381, a third path signal INPUT _ B is output through the capacitor C301, and output ends of the second path signal INPUT _ BB and the third path signal INPUT _ B are respectively connected with a signal INPUT pin 6INPUT _ B pin of;
the middle and low frequency signal processing unit comprises an operational amplifier U301B, wherein a pin 5 of the U301B is grounded, a pin 6 is connected with a normally connected end of a switch SW2-A through a resistor R302 and is connected with an output pin 7 of the operational amplifier U301B through a capacitor C304 and a resistor R304 which are connected in parallel, the output pin 7 outputs a fourth signal INPUT _ D through the capacitor C302 and outputs a fourth signal INPUT _ DD through a capacitor C382, and output ends of the fourth signal INPUT _ D and the fifth signal INPUT _ DD are respectively connected with a signal INPUT pin 17INPUT _ D pin of a power amplifier chip U302.
9. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 8, wherein: the multifunctional output condition setting module comprises resistors R376-R379, wherein one ends of the resistor R376 and the resistor R377 are respectively connected with a pin 3M1 of the power amplifier chip U302, one ends of the resistor R378 and the resistor R379 are respectively connected with a pin 4M2 of the power amplifier chip U302, the other ends of the resistor R376 and the resistor R378 are grounded, and the other ends of the resistor R377 and the resistor R379 are respectively connected with a pin 11DVDD of the power amplifier chip U302.
10. The circuit for TPA3255 series power amplifier IC multifunctional output switching according to claim 9, wherein: the multifunctional output condition setting module further comprises a resistor R360 and a resistor R351, wherein one end of the resistor R360 is connected with a signal INPUT pin 16INPUT _ C pin of the power amplifier chip U302, one end of the resistor R351 is connected with a signal INPUT pin 17INPUT _ D pin of the power amplifier chip U302, and the other ends of the resistor R360 and the resistor R351 are respectively grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020257215.2U CN211184229U (en) | 2020-03-04 | 2020-03-04 | Circuit for switching TPA3255 series power amplifier IC multifunctional output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020257215.2U CN211184229U (en) | 2020-03-04 | 2020-03-04 | Circuit for switching TPA3255 series power amplifier IC multifunctional output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211184229U true CN211184229U (en) | 2020-08-04 |
Family
ID=71810082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020257215.2U Active CN211184229U (en) | 2020-03-04 | 2020-03-04 | Circuit for switching TPA3255 series power amplifier IC multifunctional output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211184229U (en) |
-
2020
- 2020-03-04 CN CN202020257215.2U patent/CN211184229U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4771466A (en) | Multidriver loudspeaker apparatus with improved crossover filter circuits | |
| US7672461B2 (en) | Method and apparatus for creating a virtual third channel in a two-channel amplifier | |
| CN101242679B (en) | A share audio power amplification circuit for multi-audio source and its control method | |
| JP2002521902A (en) | Crossover network without capacitors for electroacoustic speakers | |
| US20110235824A1 (en) | System and Method for Excursion Limiting | |
| CN101232744A (en) | Method and device for multi sound source sharing audio power amplifier | |
| JP2013187861A (en) | Audio output circuit, electronic device using the same, and integrated circuit for audio | |
| CN101783991A (en) | Filter circuit | |
| WO2010138515A2 (en) | Dynamic contoured-sound/subwoofer-synthesis audio system | |
| CN211184229U (en) | Circuit for switching TPA3255 series power amplifier IC multifunctional output | |
| JP2014154956A (en) | Channel divider, voice reproduction system including the same, and method for setting cross-over frequency | |
| US20070121964A1 (en) | First-order loudspeaker crossover network | |
| JP4421291B2 (en) | Filter circuit and method for processing audio signals | |
| CN101472209A (en) | Apparatus for processing audio | |
| CN111212363A (en) | Circuit for switching TPA3255 series power amplifier IC multifunctional output | |
| CN110740403B (en) | Signal processing device for line array loudspeaker system and line array loudspeaker system | |
| AU659173B2 (en) | Apparatus and method for voice band reduction | |
| JP6102360B2 (en) | Channel divider and audio playback system including the same | |
| CN208299760U (en) | A kind of low distortion signal amplifier based on LM4766 | |
| CN211240070U (en) | Audio power amplifier switching circuit | |
| CN213305735U (en) | Computer sound effect enhancing circuit | |
| CN209218050U (en) | Stereo emulator based on RC double-T network | |
| CN200976587Y (en) | Device for realizing audio frequency dividing output and adjustment on handhold equipment | |
| RU1794281C (en) | Electroacoustic path | |
| CN219459273U (en) | Parametric equalizing microphone circuit and microphone apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 1st floor, electronic building, Jiuwei Xiange technology and Culture Industrial Park, Jiuwei community, Hangcheng street, Bao'an District, Shenzhen, Guangdong Province Patentee after: IAG Group Ltd. Address before: 518000 Jiuwei Xiange science and Technology Industrial Park, Xi Township, Bao'an District, Shenzhen City, Guangdong Province Patentee before: IAG GROUP Co.,Ltd. |