CN110827747A - Constant current source generating circuit of common-cathode LED display screen driving chip - Google Patents
Constant current source generating circuit of common-cathode LED display screen driving chip Download PDFInfo
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- CN110827747A CN110827747A CN201911087123.2A CN201911087123A CN110827747A CN 110827747 A CN110827747 A CN 110827747A CN 201911087123 A CN201911087123 A CN 201911087123A CN 110827747 A CN110827747 A CN 110827747A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a constant current source generating circuit of a common-cathode LED display screen driving chip, which comprises a reference current module, a bias generating circuit, a current control circuit and a constant current source output circuit which are connected in sequence; the reference current module generates reference current or voltage and generates reference current through adjustment; the bias generating circuit inputs reference current to generate bias voltages VD and VGI required by a constant current source output channel; the current control circuit inputs bias voltage VGI and current control signals S [0: M ], and the current control circuit outputs bias voltage VGO [0: M ]; the constant current source output circuit inputs bias voltages VD, VGO [0: M ] and an enable signal OE, and outputs a constant output current IOUT when the enable signal OE is effective; the invention aims to provide a constant current source generating circuit of a common-cathode LED display screen driving chip, which does not need an external chip resistor, has low power consumption and saves the system cost; the area of the chip is reduced, and meanwhile, constant current output with higher precision is realized.
Description
Technical Field
The invention relates to a constant current source generating circuit, in particular to a constant current source generating circuit of a driving chip of a common cathode LED display screen.
Background
FIG. 1 is a constant current source driving generation circuit in a common cathode LED display screen constant current source driving chip, wherein R _ EXT in the figure is an external resistor of the driving chip; fig. 2 is a flowchart of a conventional constant current source generating method.
Assuming that the gain of all amplifiers in the figure is infinite, the principle of generation of the constant current source is as follows:
1. generating a required reference potential VREF1 from Bandgap;
the source terminal potential of the NMOS transistor NM0 is clamped to VREF1 by the amplifier AMP1, so the source-drain current flowing through the PMOS transistor PM0 is: i0 ═ VREF1/R _ EXT;
c0: L is a voltage selection signal with L +1 bit width for selecting the size of VREF 2;
the drain terminal potential VD of the PMOS pipe PM0 is clamped to VREF2 by an amplifier AMP2, and the gate terminal potential VD of the PMOS pipe PM0 is output to a constant current source output channel through a buffer BUF 1;
5. when the constant current source channel is opened, the amplifier AMP _ C clamps the drain terminal potential of the PMOS tube PM _ C0 to VREF2, and the smaller VREF2 is, the lower the constant current output inflection point voltage of the constant current source output channel is;
6. the electric potentials of all the ports of the PMOS transistor PM _ C0 of the constant current source output channel are the same as the electric potentials of all the ports of the PMOS transistor PM0, the output current of the channel is a proportional mirror image of the source-drain current of the PPMOS transistor M0, and the mirror image proportion is K, so that the output constant current of the constant current source channel at the moment (absolute value) is IOUT ═ K × VREF/R _ EXT.
In a general constant current source driving chip, K is a fixed value, so the magnitude of the output constant current of the constant current source channel is generally the magnitude of the resistance for adjusting the external resistance R _ EXT.
The output constant current range of a constant current channel of a common constant current source driving chip is wide, the maximum output value of most chips in the market is more than 10 times of the minimum output value, the current variation at the moment is adjusted through R _ EXT, the variation of the I0 IOUT is more than 10 times, the smaller the R _ EXT is, the larger the I0 is, and the larger the power consumption of the chip is.
The parameters of the PMOS transistor and the PM _ C0 of each channel need to satisfy the requirement of normal operation at the maximum output current, and then when the output current is minimum, the | VGS | (the absolute value of VGS) of the PM _ C0 of the PMOS transistor and each channel becomes small, which deteriorates the two sets of current mirrors mentioned above and the precision of the output constant current source.
Therefore, in order to satisfy the range and accuracy of the constant current chip for outputting the constant current, the following cost is provided:
1. in order to meet the accuracy of the minimum output current, the width and the length of the PMOS tube and the PM _ C0 need to be increased, namely the area of the 2 devices is increased, and the most effective method is to increase the length;
2. in order to meet the maximum output current, the width-to-length ratio W/L of the PMOS transistor PM _ C0 needs to be increased, and in combination with the above strip, the width-to-length ratio W/L is generally increased on the basis of the increase of the length.
From the above two points, it can be seen that the constant current source driving generation circuit in the common-anode LED display screen constant current source driving chip has two disadvantages:
1. the area is large;
2. the current accuracy is difficult to improve because the current accuracy is proportional to the arithmetic square root of the device area, and due to the production process, the accuracy cannot be improved all the time when the area is increased to a certain amount.
Therefore, how to solve the above technical problems becomes an urgent problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a constant current source generating circuit of a driving chip of a cathode-sharing LED display screen, which does not need an external resistor of the chip, has low power consumption and saves the system cost; the area of the chip is reduced, and meanwhile, constant current output with higher precision is realized.
In order to solve the technical problem, the constant current source generating circuit of the common-cathode LED display screen driving chip comprises a reference current module, a bias generating circuit, a current control circuit and a constant current source output circuit which are connected in sequence;
the reference current module generates reference current or voltage with a low temperature coefficient or a zero temperature coefficient, and the reference current or voltage generates reference current through adjustment;
the bias generating circuit inputs reference current to generate bias voltages VD and VGI required by a constant current source output channel;
the current control circuit inputs bias voltage VGI and current control signals S [0: M ], M is M current control lines, S [0: M ] is a group of M +1 bit wide current control signals, the current control circuit outputs bias voltage VGO [0: M ], X is more than or equal to 0 and less than or equal to M, and when VGO [ X ] is effective, VGO [ X ] is VGI;
the constant current source output circuit inputs bias voltages VD, VGO [0: M ] and an enable signal OE, and outputs a constant output current IOUT when the enable signal OE is active.
The reference current module further comprises a reference current generating circuit and a current trimming circuit, wherein the reference current generating circuit generates a reference current with a low temperature coefficient or a zero temperature coefficient, and then the reference current is generated by trimming through the current trimming circuit.
The other reference current module comprises a BANDGAP circuit, a voltage trimming circuit and a reference current generating circuit, wherein the BANDGAP circuit generates a reference voltage and outputs the reference voltage to the voltage trimming circuit, and the voltage is trimmed by the voltage trimming circuit and then is input to the reference current generating circuit to generate a reference current.
A current range selection circuit is further arranged between the reference current module and the bias generation circuit, the reference current generated by the reference current module is input into the current range selection circuit, and L +1 bit wide control signals C0: L are input into the current range selection circuit to control the size of the reference current; the input end of the bias generating circuit is connected with the reference potential selecting circuit, and the control signal C0: L is input into the reference potential selecting circuit to control the magnitude of the reference potential.
The bias generating circuit further comprises a first amplifier, a first PMOS tube and a first buffer which are connected in sequence, reference current is input into a drain electrode of the first PMOS tube and the first amplifier, reference potential output by the reference potential selection circuit is input into the first amplifier, and grid potential of the first PMOS tube is output to the current control circuit through the first buffer. The drain potential VD of the first PMOS tube is clamped to the reference potential by the first amplifier.
The current control circuit further comprises M data selectors, bias voltage VGI is input into the data selectors, an enable signal S [ X ] controls the data selectors, X is more than or equal to 0 and less than or equal to M, VGO [ X ] is equal to VGI when S [ X ] is effective, and VGO [ X ] is equal to VDD when S [ X ] is ineffective; the data selector outputs the bias voltage VGO [0: M ] to the constant current source output circuit.
The constant current source output circuit further comprises a second amplifier, a second PMOS tube and a PMOS tube array, bias voltage VGO 0: M output by the power supply control circuit is input to a grid electrode of a corresponding tube in the PMOS array, drain electrodes of the PMOS tube array are connected with each other and are connected with an input end of the second amplifier and a source electrode of the second PMOS tube, bias voltage VD is input to the second amplifier, an output end of the second amplifier is connected with the grid electrode of the second PMOS tube, an enable signal OE is input to the second amplifier, and a drain electrode of the second PMOS tube outputs constant output current IOUT.
The constant current source generating circuit of the common-cathode LED display screen driving chip has the following advantages:
1. the chip external resistor R _ EXT is not needed, the power consumption is low, and the system cost is saved;
2. the inflection point voltage of the constant current output can be automatically adjusted according to the current range of the constant current output;
3. constant current output with higher precision is realized more easily;
4. and under the condition of unchanged precision requirement, the chip area can be smaller.
Drawings
FIG. 1 is a circuit diagram of a constant current source driving circuit in a constant current source driving chip of a conventional common cathode LED display screen;
fig. 2 is a block diagram of a conventional constant current source generating circuit;
FIG. 3 is a flow chart of the present invention;
FIG. 4 is a constant current driving circuit diagram of a common cathode LED display screen according to the present invention;
FIG. 5 is a block diagram of example reference current module 1;
fig. 6 is a block diagram of reference current module example 2.
Detailed Description
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
As shown in fig. 3, the constant current source generating circuit of the driving chip of the common cathode LED display screen of the present invention includes a reference current module, a bias generating circuit, a current control circuit and a constant current source output circuit, which are connected in sequence;
the reference current module generates reference current or voltage with a low temperature coefficient or a zero temperature coefficient, and the reference current or voltage generates reference current through adjustment;
the bias generating circuit inputs reference current to generate bias voltages VD and VGI required by a constant current source output channel;
the current control circuit inputs bias voltage VGI and current control signals S [0: M ], M is M current control lines, S [0: M ] is a group of M +1 bit wide current control signals, the current control circuit outputs bias voltage VGO [0: M ], X is more than or equal to 0 and less than or equal to M, and when VGO [ X ] is effective, VGO [ X ] is VGI;
the constant current source output circuit inputs bias voltages VD, VGO [0: M ] and an enable signal OE, and outputs a constant output current IOUT when the enable signal OE is active.
As shown in fig. 5, a reference current module includes a reference current generating circuit and a current trimming circuit, wherein the reference current generating circuit generates a reference current with a low temperature coefficient or a zero temperature coefficient, and the reference current is trimmed and generated by the current trimming circuit.
As shown in fig. 6, another reference current module includes a BANDGAP circuit, a voltage trimming circuit and a reference current generating circuit, the BANDGAP circuit generates a reference voltage and outputs the reference voltage to the voltage trimming circuit, and the reference voltage is trimmed by the voltage trimming circuit and then input to the reference current generating circuit to generate a reference current.
As shown in FIG. 4, a current range selection circuit is arranged between the reference current module and the bias generation circuit, the reference current generated by the reference current module is input into the current range selection circuit, and the L +1 bit wide control signal C [0: L ] is input into the current range selection circuit to control the magnitude of the reference current; the input end of the bias generating circuit is connected with the reference potential selecting circuit, and the control signal C0: L is input into the reference potential selecting circuit to control the magnitude of the reference potential.
As shown in fig. 4, the bias generating circuit includes a first amplifier, a first PMOS transistor and a first buffer connected in sequence, a reference current is input to the drain of the first PMOS transistor and the first amplifier, a reference potential output by the reference potential selecting circuit is input to the first amplifier, and a gate potential of the first PMOS transistor is output to the current control circuit through the first buffer. The drain potential VD of the first PMOS tube is clamped to the reference potential by the first amplifier.
As shown in fig. 4, the current control circuit includes M data selectors, the bias voltage VGI is input to the data selectors, the enable signal S [ X ] controls the data selectors, X is set to 0 ≦ M, VGO [ X ] ═ VGI when S [ X ] is active, and VGO [ X ] ═ VDD when S [ X ] is inactive; the data selector outputs the bias voltage VGO [0: M ] to the constant current source output circuit.
As shown in FIG. 4, the constant current source output circuit includes a second amplifier, a second PMOS transistor and a PMOS transistor array, wherein the bias voltage VGO 0: M outputted by the power control circuit is inputted to the gate of the corresponding transistor in the PMOS array, the drain of the PMOS transistor array is connected to the input terminal of the second amplifier and the source of the second PMOS transistor, the bias voltage VD is inputted to the second amplifier, the output terminal of the second amplifier is connected to the gate of the second PMOS transistor, the enable signal OE is inputted to the second amplifier, and the drain of the second PMOS transistor outputs a constant output current IOUT.
The working process of the constant current source generating circuit of the common-cathode LED display screen driving chip is as follows:
1. the reference current generating circuit:
1.1 generating a reference current or voltage with a low temperature coefficient or a zero temperature coefficient;
and 1.2, generating a reference current by trimming the reference current or the voltage, and enabling the constant current output of the chip to meet the precision requirement of design by trimming.
2. Current range selection circuit: c0: L is a control signal with L +1 bit width, and can control the magnitude of the bias current Iref, thereby controlling the current range of constant current output.
3. Reference potential selection circuit: c0: L also controls the size of the reference potential VREF, the reference potential VREF and the bias current Iref change in opposite directions, namely the lower the selected reference potential VREF is, the larger the bias current Iref correspondingly is.
4. A bias generation circuit: the bias voltages VD and VGI required by the constant current source output channel are generated, the potential VD of the drain end of the first PMOS pipe PM1 is clamped to the reference potential VREF by the first amplifier AMP3, and the potential of the grid end of the first PMOS pipe PM1 is output to the current control circuit through the first buffer BUF 1.
5. The current control circuit: the constant current source output circuit comprises M data selectors MUX, S [0: M ] is a group of current control signals with M +1 bit width, and whether bias voltages VGO [0: M ] of the constant current source output circuit are effective or not is controlled through S [0: M ], so that the size of constant current IOUT output by a chip is controlled. When VGO X is effective, VGO X is equal to or less than VGI; when VGO [ X ] is invalid, VGO [ X ] is VDD.
6. Constant current source output circuit: when the enable signal OE is asserted, the constant current source output circuit generates a constant output current IOUT. When the channel is opened, the potential of the drain of the PMOS transistor PM _ C [0: N ] is clamped to VD by the second amplifier AMP _ C. When SX is effective, the electric potentials of all the ports of the PMOS tube PM _ C [ X ] of the constant current source output channel are the same as the electric potentials of all the ports of the first PMOS tube PM1, and the output current of the channel is a proportional mirror image of the source-drain current Iref of the first PMOS tube PM 1. By setting the proper mirror ratio k 0: M of the PMOS tube array PM _ C0: M and the first PMOS tube PM1, wide-range constant current output can be realized.
The magnitude and range of the output current are respectively as follows:
in the formula, SX is 1 when it is valid, and 0 when SX is invalid.
In the circuit structure, an external resistor of a chip is not needed, and the structure of the bias generating circuit is simplified. The precision of constant current output can be controlled more easily through the trimming of the trimming circuit. The current Iref generated by the current range selection circuit has a small variation range, and the power consumption of the structure can be kept at a relatively small value no matter how large the current is output by the constant current source output channel. When the range of the constant current output is changed, the inflection point voltage of the output end is also changed. Since the reference potential VREF and the bias current Iref change in opposite directions, the VGS voltage absolute value of the first PMOS transistor PM1 can be designed to be a larger value, and the change amount of the value is small, and under the same accuracy requirement, the width value, length value, i.e., W value, of the first PMOS transistor PM1 and the PMOS transistor array can be designed to be smaller, so that the chip area is smaller.
In summary, the practical samples which have been prepared according to the present invention as described in the specification and shown in the drawings are tested for a long time, and from the results of the use test, it is needless to say that the expected purpose of the present invention can be achieved and the practical value is no longer questionable. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.
Claims (7)
1. A constant current source generating circuit of a common cathode LED display screen driving chip is characterized in that: the device comprises a reference current module, a bias generation circuit, a current control circuit and a constant current source output circuit which are connected in sequence;
the reference current module generates reference current or voltage with a low temperature coefficient or a zero temperature coefficient, and the reference current or voltage generates reference current through adjustment;
the bias generating circuit inputs reference current to generate bias voltages VD and VGI required by a constant current source output channel;
the current control circuit inputs bias voltage VGI and current control signals S [0: M ], M is M current control lines, S [0: M ] is a group of M +1 bit wide current control signals, the current control circuit outputs bias voltage VGO [0: M ], X is more than or equal to 0 and less than or equal to M, and when VGO [ X ] is effective, VGO [ X ] is VGI;
the constant current source output circuit inputs bias voltages VD, VGO [0: M ] and an enable signal OE, and outputs a constant output current IOUT when the enable signal OE is active.
2. The circuit for generating a constant current source of a driving chip of a cathode-sharing LED display screen of claim 1, wherein the reference current module comprises a reference current generating circuit and a current trimming circuit, the reference current generating circuit generates a reference current with a low temperature coefficient or a zero temperature coefficient, and the reference current is generated by trimming the reference current with the current trimming circuit.
3. The circuit for generating a constant current source of a driving chip of a cathode-sharing LED display screen of claim 1, wherein the reference current module comprises a BANDGAP circuit, a voltage trimming circuit and a reference current generating circuit, the BANDGAP circuit generates a reference voltage and outputs the reference voltage to the voltage trimming circuit, and the reference voltage is trimmed by the voltage trimming circuit and then input to the reference current generating circuit to generate a reference current.
4. The circuit for generating a constant current source of a driving chip of a cathode-sharing LED display screen according to any one of claims 1 to 3, wherein a current range selection circuit is arranged between the reference current module and the bias generation circuit, the reference current generated by the reference current module is input into the current range selection circuit, and a control signal C [0: L ] with L +1 bit width is input into the current range selection circuit to control the magnitude of the reference current; the input end of the bias generating circuit is connected with the reference potential selecting circuit, and the control signal C0: L is input into the reference potential selecting circuit to control the magnitude of the reference potential.
5. The constant current source generating circuit of the driving chip of the cathode-sharing LED display screen according to claim 4, wherein: the bias generating circuit comprises a first amplifier, a first PMOS tube and a first buffer which are connected in sequence, reference current is input into a drain electrode of the first PMOS tube and the first amplifier, reference potential output by the reference potential selection circuit is input into the first amplifier, and grid potential of the first PMOS tube is output to the current control circuit through the first buffer.
6. The constant current source generating circuit of the driving chip of the cathode-sharing LED display screen according to claim 5, wherein: the current control circuit comprises M data selectors, bias voltage VGI is input into the data selectors, an enable signal S [ X ] controls the data selectors, X is more than or equal to 0 and less than or equal to M, VGO [ X ] is equal to VGI when S [ X ] is effective, and VGO [ X ] is equal to VDD when S [ X ] is ineffective; the data selector outputs the bias voltage VGO [0: M ] to the constant current source output circuit.
7. The circuit for generating a constant current source of a driving chip of a cathode-sharing LED display screen according to claim 6, wherein: the constant current source output circuit comprises a second amplifier, a second PMOS tube and a PMOS tube array, bias voltage VGO 0: M output by the power supply control circuit is input to a grid electrode of a corresponding tube in the PMOS array, drain electrodes of the PMOS tube array are connected with each other and are connected with an input end of the second amplifier and a source electrode of the second PMOS tube, bias voltage VD is input to the second amplifier, an output end of the second amplifier is connected with the grid electrode of the second PMOS tube, an enable signal OE is input to the second amplifier, and a drain electrode of the second PMOS tube outputs constant output current IOUT.
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| CN112034922A (en) * | 2020-11-06 | 2020-12-04 | 成都铱通科技有限公司 | Positive temperature coefficient bias voltage generating circuit with accurate threshold |
| CN112034922B (en) * | 2020-11-06 | 2021-01-15 | 成都铱通科技有限公司 | Positive temperature coefficient bias voltage generating circuit with accurate threshold |
| CN113257179A (en) * | 2021-05-24 | 2021-08-13 | 中科芯集成电路有限公司 | Zero-temperature-drift current circuit for built-in resistor of LED display driving chip |
| CN113257179B (en) * | 2021-05-24 | 2023-02-28 | 中科芯集成电路有限公司 | Zero-temperature-drift current circuit for built-in resistor of LED display driving chip |
| CN115379619A (en) * | 2022-10-13 | 2022-11-22 | 合肥灿芯科技有限公司 | LED common-cathode driving chip |
| CN115985236A (en) * | 2023-03-17 | 2023-04-18 | 成都利普芯微电子有限公司 | Drive chip, drive system and electronic equipment |
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| CN110827747B (en) | 2020-10-30 |
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