CN105406714A - DC-DC converter integrated circuit and application circuit thereof - Google Patents
DC-DC converter integrated circuit and application circuit thereof Download PDFInfo
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- CN105406714A CN105406714A CN201510981446.1A CN201510981446A CN105406714A CN 105406714 A CN105406714 A CN 105406714A CN 201510981446 A CN201510981446 A CN 201510981446A CN 105406714 A CN105406714 A CN 105406714A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a DC-DC converter integrated circuit. The DC-DC converter integrated circuit comprises an oscillation unit which generates an oscillating pulse signal; a triggering unit which is connected with the oscillation unit and regards the received oscillating pulse signal as one triggering signal; a switch driving unit which is connected with the triggering unit; a comparing unit; and at least a Darlington driving unit. The signal output end of the switch driving unit is led outwards to connect with a voltage output unit; the voltage output unit outputs a driving voltage used for driving a load; a reference voltage signal is arranged in a path of signal input; and the other path of signal input is voltage signals which are sampled from the voltage output unit through a sampling unit; the comparing unit outputs a first electric level signal which serves as another triggering signal of the triggering unit based on the sizes of the two paths of the voltage signals; and the comparing unit is connected with the triggering unit. As a DC-DC converter and a Darlington driver are arranged in the integrated circuit, units of a relay waiting for driving can be directly driven while standby power consumption is reduced, and the DC-DC converter integrated circuit is convenient to use.
Description
Technical field
The invention belongs to Power convert field, particularly relate to a kind of integrated circuit and the application circuit thereof that are built-in with DC-DC converter and Darlington driver element.
Background technology
Industrial Frequency Transformer is extensively adopted to add the mode of 7805 as power panel in electric heater on market today, gas heater, washing machine and electric fan, its by 8 ~ 30V DC power supply by 7805 source of stable pressure module converts be 5V direct current export, with give whole control circuit power.See Fig. 1, it is the power panel line map extensively adopted at present.Wherein 7805 source of stable pressure modules 100 by input DC power VCC (power supply VCC be by 220V alternating current through Industrial Frequency Transformer step-down and rectification is the DC power supply of 8V to 30V) convert to 5V DC voltage-stabilizing export, during application:
1, adopt 7805 as source of stable pressure, power supply conversion efficiency is low;
2,7805 heatings seriously additionally need increase fin, and along with the increase heating of power is seriously to unacceptable degree, can not meet the demand of high-power output;
3, the power consumption in order to reduce by 7805 need increase R1 current-limiting resistance in input prime, and this current-limiting resistance R1 power consumption is higher need adopt power resistor, and cost is higher.
Further, in power panel illustrated in fig. 1, drive No. 3 relays 200,300,400 to have employed 3 triodes, 3 resistance and 3 diodes respectively, device count is more.The signal that B1 ~ B3 termination receives main control chip controls relay, and when B1 ~ B3 end is for low level, NPN pipe turns off, and relay turns off; When B1 ~ B3 end is for high level, the conducting of NPN pipe, relay work.As can be seen here, it mainly adopts discrete device to drive relay, and integrated level is low, processed complex, and cost is high.
Summary of the invention
The defect that the object of the invention is to exist for the power panel of present household electrical appliance provides a kind of DC-DC converter integrated circuit, this IC interior is designed with DC-DC converter, adopt DC-DC converter to replace 7805 source of stable pressure, can stand-by power consumption be reduced, obtain higher power supply conversion efficiency.
Another object of the present invention there is provided the application circuit of said integrated circuit, and this application circuit achieves the conversion of DC power supply in conjunction with integrated circuit.
The object of the invention is to realize by the following technical solutions:
A kind of DC-DC converter integrated circuit, for carrying out DC power supply conversion, it comprises:
Oscillating unit, it produces oscillation pulse signal after ic power end is powered;
Trigger element, it connects oscillating unit, and using the oscillation pulse signal that receives as one of them triggering signal;
Switch drive unit, it connects trigger element, and the signal output part of described switch drive unit outwards draws to connect voltage output unit, exports the driving voltage in order to drive load by voltage output unit;
Comparing unit, it has two paths of signals input, wherein a road signal input is provided with reference voltage signal, an other road signal be input as from voltage output unit through sampling unit adopt into voltage signal, described comparing unit exports the first level signal based on two-way voltage signal size, described comparing unit connects trigger element, with the another one triggering signal making the first level signal of output be formed trigger element; Described trigger element exports based on two triggering signals and allows the second electrical level signal of switch driver element break-make.
Be further, present invention also offers a kind of application circuit of above-mentioned DC-DC converter integrated circuit, comprise the voltage output unit being connected to integrated circuit switch driver element, and the output voltage of voltage output unit is fed back to the sampling unit of integrated circuit comparing unit, wherein
Described voltage output unit comprises:
Inductance, its one end is connected to the signal output part that switch drive unit is outwards drawn, and the other end is through a charging capacitor earth connection, and the described other end of inductance exports the driving voltage in order to drive load;
Fly-wheel diode, its negative electrode is connected to one end described in inductance, plus earth line;
Described sampling unit comprises:
First resistance of mutual series connection and the second resistance, the first resistance after series connection and second resistance one end are connected to the other end described in inductance, the other end is connected to the anode of fly-wheel diode, think that fly-wheel diode provides continuous current circuit, wherein the serial connection point of the first resistance and the second resistance forms the voltage sample point of sampling unit, and this voltage sample point is connected to the signal input part that comparing unit is outwards drawn.
Owing to have employed technique scheme, DC-DC converter integrated circuit of the present invention has the following advantages:
1. IC interior is designed with DC-DC converter, adopts DC-DC converter to replace 7805 source of stable pressure, for realizing the conversion of DC power supply, reducing stand-by power consumption, improve power supply conversion efficiency; 2. integrated circuit heating is little, continues output current large, without the need to considering heat dissipation design; 3. high integration, reduces component number, processes simpler; 4. overall cost is lower.Generally speaking, integrated circuit of the present invention can be widely used in, in the household appliances power boards such as electric heater, gas heater, washing machine, disinfection cabinet, electric fan, meeting household appliances to energy-saving and emission-reduction requirement.
Accompanying drawing explanation
Fig. 1 is the power panel local line figure extensively adopted at present;
Fig. 2 is the inside schematic diagram of DC-DC converter integrated circuit of the present invention;
Fig. 3 is the application circuit of DC-DC converter integrated circuit of the present invention;
Fig. 4 is the inside schematic diagram that Darlington of the present invention drives.
Embodiment
The technological means realized to make the present invention, creation characteristic, reach object and effect clearly and be easy to understand, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated:
With reference to Fig. 2 composition graphs 3, the invention provides a kind of DC-DC converter integrated circuit 500, for carrying out DC power supply conversion, it comprises:
Oscillating unit 510, it produces oscillation pulse signal after ic power end VCC powers;
Trigger element 520, it connects oscillating unit 510, and using the oscillation pulse signal that receives as one of them triggering signal;
Switch drive unit 530, it connects trigger element 520, and the signal output part of described switch drive unit 530 outwards draws binding post SE to connect voltage output unit 600, exports by voltage output unit 600 the driving voltage OUT driving load;
Comparing unit 540, it has two paths of signals input, wherein a road signal input is provided with reference voltage signal, an other road signal be input as from voltage output unit 600 through sampling unit 700 adopt into voltage signal, described comparing unit 540 exports the first level signal based on two-way voltage signal size, described comparing unit 540 connects trigger element 520, with the another one triggering signal making the first level signal of output be formed trigger element 520; Described trigger element 520 exports based on two triggering signals and allows the second electrical level signal of switch driver element 530 break-make.
From such scheme, DC-DC converter integrated circuit of the present invention is when VCC powers, oscillation pulse signal is produced mainly through oscillating unit 510, make switch drive unit 530 continuous break-make under the effect of trigger element 520, and then the output voltage Vout after outside voltage output unit obtains conversion, realize Power convert, and the size Vout of this output voltage depends on comparing unit 540 and output voltage signal is fed back to the sampling unit 700 of comparing unit 540.In general, said integrated circuit can substitute 7805 source of stable pressure of existing power supply plate completely, and has the outstanding advantage that heating is low, conversion efficiency is high compared to 7805 source of stable pressure.
As Fig. 2-3, described oscillating unit 510 comprises oscillator, described oscillator inside arranges the oscillating circuit (not shown) that promising trigger element 520 provides described oscillation pulse signal, and described oscillating circuit comprises outwards draws with the TC pin connecting timing capacitor C7 and by the constant-current source (not shown) of TC pin to described timing capacitor C7 discharge and recharge.Oscillator is externally connected on the timing capacitor C7 constantly charging and discharging on TC pin by constant-current source, to produce waveform.Charging and discharging electric current is all constant, so frequency of oscillation only depends on the capacity of external timing capacitor.Also have a resistance R7, this resistance R7 that are connected to TC pin in Fig. 3 can afford redress electric current, can play the effect reducing output ripple.
Wherein, described trigger element 520 comprises rest-set flip-flop, the set end S of described rest-set flip-flop is provided with logical "and" door, one of them input (C end) of wherein said logical "and" door and the reset terminal R of rest-set flip-flop receive the oscillation pulse signal of self-oscillating circuit, the another one input (D end) of described logical "and" door receives the first level signal exported from comparing unit 540, see Fig. 2.As can be seen here, the output level of rest-set flip-flop depends on the input of logical "and" door, when the oscillation pulse signal that oscillating unit produces is in high level and the first level signal that comparing unit exports is high level, the second electrical level signal that rest-set flip-flop exports is high; Otherwise if the oscillation pulse signal of oscillating unit generation is in low level, rest-set flip-flop reset terminal is effective, and the second electrical level signal that rest-set flip-flop exports is low, whether the output level now regardless of comparing unit 540 is high or is low.
With reference to Fig. 2-3, described switch drive unit 530 adopts compound NPN pipe to form (i.e. NPN4 and NPN5), the base stage b of described compound NPN pipe is electrically connected to the output of rest-set flip-flop, collector electrode c outwards draws to connect power supply Vcc by a current-limiting resistance R8, and emitter e outside leading-out terminal SE is in order to connect described voltage output unit 600.Wherein binding post DC outwards drawn by the collector electrode of NPN5 pipe, and binding post SC outwards drawn by the collector electrode of NPN4 pipe, and these two binding posts, when applying, are all connected to power supply Vcc by current-limiting resistance R8, think that compound NPN pipe provides collector current.When rest-set flip-flop output is set to high level, the conducting of compound NPN pipe; Otherwise when rest-set flip-flop is reset, compound NPN pipe is in closed condition.
Wherein, described comparing unit 540 is comparator, and the electrode input end "+" of described comparator arranges described reference voltage signal, negative input "-" receive from described voltage output unit through sampling unit adopt into voltage signal.See Fig. 2, described reference voltage signal is 1.25V, and outwards draws the ground pin GND of integrated circuit.Negative input "-" outwards draws the COMP end of integrated circuit.Composition graphs 3, voltage output unit is made up of inductance L 2, electric capacity C6 and sustained diode 4, and sampling unit is in series by R5 and R6, is sampled to output voltage by the two, sampled signal is fed back to COMP end and compares.When COMP terminal voltage is higher than 1.25V, the first level signal that comparator exports is low level, now internal wiring switch-off power pipe, and output voltage reduces, and forms a negative feedback loop.As can be seen here, final output voltage is determined by sampling resistor R5, R6, and output voltage computing formula is Vout=(R5+R6)/R5*1.25V.
As a preferred embodiment of the present invention be, described oscillator inside is also provided with current limit circuit (not specifically illustrating), the output of described current limit circuit is electrically connected with TC pin, input is outwards drawn and is formed current sense pin Isense, described current limit circuit connects described current-limiting resistance R8 by current sense pin Isense, and the self-starting when detecting that described current-limiting resistance R8 pressure drop exceedes certain threshold value, to be charged to described timing capacitor C7 by TC pin.Here current limit circuit is common circuit, therefore repeats no more.
Here, due to the collector electrode pull-up resistor that current-limiting resistance R8 is NPN4 and NPN5 pipe in switch drive unit, R8 connects power supply VCC, if the pressure drop on R8 is excessive, namely the collector current flowing through NPN4 and NPN5 pipe is excessive, NPN4 and NPN5 likely can be made impaired.Integrated circuit (IC) design of the present invention current sense pin Isense, makes just to make the quick closedown of switch drive unit when R8 pressure drop exceedes certain threshold value for this reason.Current limit Isense test side completes function by detecting the pressure drop be connected between VCC and Isense pin on resistance R8.Working mechanism is: when detecting that the voltage drop on resistance R8 is close to during more than 300mV, current limit circuit is started working.At this moment by TC pin, quick charge is carried out to timing capacitor C7, nearly speech it, the charging current of timing capacitor C7 superposes on the basis of original constant current source charging, therefore charging current increases, and the charging interval reduces, and oscillation pulse signal is in high level when charging, therefore the minimizing in charging interval, the time that oscillating impulse is in high level will be shortened, also just decrease the ON time of switch drive unit, otherwise extend the shut-in time of switch drive unit.
Mention in the introduction, on existing power panel, the main discrete device that adopts drives relay, and integrated level is low, processed complex, and cost is high.For addressing this problem, DC-DC converter integrated circuit of the present invention also comprises: multichannel Darlington driver element 550, the signal input part of every road Darlington driver element 550 outwards draws B1 ~ B3 to receive external control signal, and the signal output part of every road Darlington driver element 550 outwards draws C1 ~ C3 to connect unit to be driven.The signal output part of each road Darlington driver element is also all connected to the anode of diode D1, D2, a D3, and the negative electrode of all diode D1, D2, D3 outwards draws the common port COM forming integrated circuit jointly.Described unit to be driven is relay 200,300,400.Realized the control of outside relay by the Darlington driver element being integrated in integrated circuit, for traditional discrete device drives, device is less and process convenient.
Fig. 4 gives the internal wiring schematic diagram of Darlington driver element, its operation principle is: when incoming level is low level, due to the effect of resistance R10 ~ R13, NPN pipe is in off state, circuit output end does not arrive the path on ground, C end exports as high level, and the relay being connected to this output is in off state; After incoming level is greater than 2 EB junction voltages, the conducting of 2 NPN pipes, forms classical Darlington Drive Structure, and C point voltage reduces, and drives relay conducting.Diode D5 plays the effect improving device antistatic effect.A representative value of input port design is the pull down resistor R10 of 4K, and this resistance elevator system reliability, prevents main control chip powered on moment from there is interference output signals.
On the basis of said integrated circuit, the present invention gives the application circuit of said integrated circuit 500, and see Fig. 3, it mainly comprises:
Be connected to the voltage output unit 600 of integrated circuit 500 switch drive unit 530, and the output voltage of voltage output unit 600 fed back to the sampling unit 700 of integrated circuit comparing unit 540, wherein,
Described voltage output unit comprises: inductance L 2, and its one end is connected to the signal output part SE that switch drive unit is outwards drawn, and the other end is through a charging capacitor C6 earth connection, and the described other end of inductance exports the driving voltage OUT in order to drive load; Sustained diode 4, its negative electrode is connected to one end described in inductance, plus earth line;
Described sampling unit comprises: the first resistance R5 of series connection mutually and the second resistance R6, the first resistance R5 after series connection and second resistance R6 one end are connected to the other end described in inductance L 2, the other end is connected to the anode of sustained diode 4, think that sustained diode 4 provides continuous current circuit, wherein the serial connection point of the first resistance R5 and the second resistance R6 forms the voltage sample point A of sampling unit, and this voltage sample point A is connected to the signal input part COMP that comparing unit is outwards drawn.
Above-mentioned voltage output unit, when 530 conducting of switch drive unit, is charged to electric capacity C6 by inductance L 2, and the charge point position of electric capacity C6 is constantly raised; And when switch drive unit 530 disconnects, be inductance L 2 freewheel current by sustained diode 4, the first resistance R5 and the second resistance R6 provides continuous current circuit; Like this by the continuous charging to electric capacity C6, output voltage OUT constantly raises, and then obtains corresponding DC power supply.
With reference to Fig. 2, DC-DC converter integrated circuit of the present invention comprises 16 pins altogether.Wherein VCC and COM pin meets power supply VCC, E and GND pin ground connection.SC, DC and Isense pin meets VCC by current-limiting resistance R8.The external timing capacitor C7 of TC pin.R5 and R6 samples to output voltage, sampled signal is fed back to COMP end and compares.When requiring lower to the ripple of output voltage, the secondary filter that can be made up of L1, C5 in output termination, thus reduce the ripple of out-put supply.Wherein, the signal that B1 ~ B3 pin receives main control chip controls relay, and C1 ~ C3 contact relay, realizes the control to No. three relays.
Next, with reference to Fig. 2 the application circuit of composition graphs 3, the specific works principle of DC-DC converter integrated circuit of the present invention is as follows:
After power supply VCC powers on, internal oscillator is started working generation oscillation pulse signal, driving power pipe NPN4, NPN5 conducting when pulse cycle of oscillation is high level, electric current flows through resistance R8, power tube NPN4 and NPN5, inductance L 2 from VCC, charges to electric capacity C6.When pulse cycle of oscillation is low level, power tube NPN4, NPN5 close, and because inductance L 2 electric current can not transition, now provide inductance L 2 freewheel current by sustained diode 4.Like this by the continuous charging to electric capacity C6, output voltage constantly raises.R5 and R6 samples to output voltage, sampled signal is fed back to COMP end and compares.When COMP terminal voltage is higher than 1.25V, internal wiring switch-off power pipe, output voltage reduces, and forms a negative feedback loop.Final output voltage is determined by sampling resistor R5, R6, and output voltage computing formula is Vout=(R5+R6)/R5*1.25V.Wherein the C input of logical "and" door is high level when a pair of oscillators charges outward, the D input of logical "and" door at the incoming level of comparator lower than during 1.25V level being high level.When C and D input all becomes high level, trigger is set to high level, switch drive unit (compound NPN pipe) conducting.Otherwise when oscillator is at interdischarge interval, C input is low level, and trigger is reset, switch drive unit (compound NPN pipe) is made to be in closed condition.
DC-DC converter integrated circuit of the present invention adopts SOP16 or DIP16 encapsulation, changes for realizing DC-DC power source and drives No. 3 relays.Certainly SOP18 or DIP18 also can be adopted to encapsulate, change for realizing DC-DC power source and drive No. 4 relays.Adopt SOP20 or DIP20 encapsulation, change for realizing DC-DC power source and drive No. 5 relays.Generally, DC-DC converter integrated circuit of the present invention, being applied on present power panel, can play very important effect, has good promotional value.
Although embodiment of the present invention are open as above, but it is not restricted to listed in specification and execution mode utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (10)
1. a DC-DC converter integrated circuit, for carrying out DC power supply conversion, is characterized in that, comprising:
Oscillating unit, it produces oscillation pulse signal after ic power end is powered;
Trigger element, it connects oscillating unit, and using the oscillation pulse signal that receives as one of them triggering signal;
Switch drive unit, it connects trigger element, and the signal output part of described switch drive unit outwards draws to connect voltage output unit, exports the driving voltage in order to drive load by voltage output unit;
Comparing unit, it has two paths of signals input, wherein a road signal input is provided with reference voltage signal, an other road signal be input as from voltage output unit through sampling unit adopt into voltage signal, described comparing unit exports the first level signal based on two-way voltage signal size, described comparing unit connects trigger element, with the another one triggering signal making the first level signal of output be formed trigger element; Described trigger element exports based on two triggering signals and allows the second electrical level signal of switch driver element break-make.
2. DC-DC converter integrated circuit as claimed in claim 1, it is characterized in that, described oscillating unit comprises oscillator, described oscillator inside arranges the oscillating circuit that promising trigger element provides described oscillation pulse signal, and described oscillating circuit comprises outwards draws with the TC pin connecting timing capacitor and by the constant-current source of TC pin to described timing capacitor discharge and recharge.
3. DC-DC converter integrated circuit as claimed in claim 2, it is characterized in that, described trigger element comprises rest-set flip-flop, the set end of described rest-set flip-flop is provided with logical "and" door, one of them input of wherein said logical "and" door and the reset terminal of rest-set flip-flop receive the oscillation pulse signal of self-oscillating circuit, and the another one input of described logical "and" door receives the first level signal exported from comparing unit.
4. DC-DC converter integrated circuit as claimed in claim 3, it is characterized in that, described switch drive unit adopts compound NPN pipe to form, the base stage of described compound NPN pipe is electrically connected to the output of rest-set flip-flop, collector electrode outwards draws to connect power supply by a current-limiting resistance, and the outside leading-out terminal of emitter is in order to connect described voltage output unit.
5. DC-DC converter integrated circuit as claimed in claim 4, it is characterized in that, described comparing unit is comparator, and the electrode input end of described comparator arranges described reference voltage signal, negative input receive from described voltage output unit through sampling unit adopt into voltage signal.
6. DC-DC converter integrated circuit as claimed in claim 5, it is characterized in that, described oscillator inside is also provided with current limit circuit, the output of described current limit circuit is electrically connected with TC pin, input outwards draws formation current sense pin, described current limit circuit connects described current-limiting resistance by current sense pin, and the self-starting when detecting that described current-limiting resistance pressure drop exceedes certain threshold value, to be charged to described timing capacitor by TC pin.
7. DC-DC converter integrated circuit as claimed in claim 6, it is characterized in that, also comprise: multichannel Darlington driver element, the signal input part of every road Darlington driver element outwards draws to receive external control signal, and the signal output part of every road Darlington driver element outwards draws to connect unit to be driven.
8. DC-DC converter integrated circuit as claimed in claim 7, it is characterized in that, the signal output part of each road Darlington driver element is also all connected to the anode of a diode, and the negative electrode of all diodes outwards draws the common port forming integrated circuit jointly.
9. DC-DC converter integrated circuit as claimed in claim 8, it is characterized in that, described unit to be driven is relay.
10. the application circuit of the DC-DC converter integrated circuit as described in any one of claim 1 ~ 9, it is characterized in that, comprise the voltage output unit being connected to integrated circuit switch driver element, and the output voltage of voltage output unit is fed back to the sampling unit of integrated circuit comparing unit, wherein
Described voltage output unit comprises:
Inductance, its one end is connected to the signal output part that switch drive unit is outwards drawn, and the other end is through a charging capacitor earth connection, and the described other end of inductance exports the driving voltage in order to drive load;
Fly-wheel diode, its negative electrode is connected to one end described in inductance, plus earth line;
Described sampling unit comprises:
First resistance of mutual series connection and the second resistance, the first resistance after series connection and second resistance one end are connected to the other end described in inductance, the other end is connected to the anode of fly-wheel diode, think that fly-wheel diode provides continuous current circuit, wherein the serial connection point of the first resistance and the second resistance forms the voltage sample point of sampling unit, and this voltage sample point is connected to the signal input part that comparing unit is outwards drawn.
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| CN109150160A (en) * | 2018-10-23 | 2019-01-04 | 重庆中科芯亿达电子有限公司 | Integrated circuit with pressure stabilizing, buzzer driving and relay driving function |
| CN110442013A (en) * | 2019-10-08 | 2019-11-12 | 机械科学研究总院江苏分院有限公司 | A kind of drive module |
| CN110504832A (en) * | 2019-09-19 | 2019-11-26 | 晶艺半导体有限公司 | Control circuit and method for high pressure BUCK switch converters |
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| CN101004893A (en) * | 2006-01-17 | 2007-07-25 | 厦门火炬福大显示技术有限公司 | Power supply unit of field emission display |
| CN101217252A (en) * | 2008-01-04 | 2008-07-09 | 华中科技大学 | A soft start circuit for PDM DC-DC switching power supply |
| CN101976945A (en) * | 2010-11-02 | 2011-02-16 | 深圳市富满电子有限公司南山分公司 | Switch type buck regulator circuit |
| CN103095130A (en) * | 2011-10-31 | 2013-05-08 | 上海酷能微电子有限公司 | Integrated circuit chip based on complementary metal oxide semiconductor (CMOS) technology and used for converter control circuit |
| CN205265526U (en) * | 2015-12-23 | 2016-05-25 | 重庆中科芯亿达电子有限公司 | DC -DC converter integrated circuit and application circuit thereof |
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| CN109150160A (en) * | 2018-10-23 | 2019-01-04 | 重庆中科芯亿达电子有限公司 | Integrated circuit with pressure stabilizing, buzzer driving and relay driving function |
| CN110504832A (en) * | 2019-09-19 | 2019-11-26 | 晶艺半导体有限公司 | Control circuit and method for high pressure BUCK switch converters |
| CN110504832B (en) * | 2019-09-19 | 2024-04-26 | 晶艺半导体有限公司 | Control circuit and method for high-voltage BUCK switch converter |
| CN110442013A (en) * | 2019-10-08 | 2019-11-12 | 机械科学研究总院江苏分院有限公司 | A kind of drive module |
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