Dual foot constant current IC

Abstract

The utility model discloses a double foot constant current IC, including voltage generator, power generator, amplifier, MOS pipe, amplifier and voltage generator and power generator electric connection, a plurality of sets of MOS pipe electric connection is on power interface PAD1 pin and the output OUT pin of amplifier, and MOS pipe and first pad electric connection, and right side MOS pipe electric connection has first resistance R, and the negative input IN_P pin of amplifier and first resistance R electric connection, and the negative power VSS pin of voltage generator and power generator's power interface PAD1 pin, negative power VSS pin electric connection has second pad, and first resistance R and second pad electric connection, double foot constant current IC will voltage generator, power generator, amplifier, MOS pipe, integrated design together, and double foot avoids the problem of multi-pin signal crosstalk, reduces the current fluctuation caused by signal intersection, and guarantees the light efficiency uniformity, and the double foot constant current IC package volume is smaller, and adapts ultrathin lamps and lanterns, flexible lamp band and other compact scene.

Description

Technical Field

[0001] This utility model relates to the field of LED strip technology, specifically a dual-pin constant current IC. Background Technology

[0002] Currently, constant current ICs, through their built-in current regulation mechanisms, ensure that the output current of the LED strip remains constant when the voltage or load changes. This effectively avoids flickering or inconsistent brightness caused by voltage fluctuations. Constant current ICs also limit the maximum current to prevent the LED strip from overheating due to overcurrent.

[0003] In related technologies, commonly used constant current ICs are usually 3-pin and 5-pin, such as power input pin, ground pin, feedback pin, enable pin, etc. Such constant current ICs not only require more complex peripheral circuits, but the internal circuits of the constant current ICs are also more complex. 3-pin and 5-pin constant current ICs are large in size and difficult to adapt to compact scenarios such as ultra-thin lamps and flexible light strips. In high-density LED light strips, there is a problem of crosstalk between multiple pin signals. The current fluctuation caused by signal crossing affects the uniformity of light efficiency of the light strip. Utility Model Content

[0004] The purpose of this invention is to provide a dual-pin constant current IC to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-pin constant current IC, including a voltage generator, wherein the voltage generator has a low-voltage power supply LVDD pin, a positive voltage VBP pin, a negative power supply VSS pin, and a voltage output VGEN pin;

[0006] A power generator has a power interface pin PAD1, a negative power supply pin VSS, a low voltage power supply pin LVDD, and a negative voltage pin VBN. The power interface pin PAD1 is electrically connected to a first pad.

[0007] An amplifier, which is electrically connected to a voltage generator and a power generator;

[0008] The MOS transistors are arranged in several groups, and the groups of MOS transistors are electrically connected to the PAD1 pin of the power interface and the OUT pin of the amplifier. The MOS transistors are electrically connected to the first pad, and the right MOS transistors are electrically connected to the first resistor R. The current of the groups of MOS transistors is adjusted by their own switching.

[0009] The negative input IN_P pin of the amplifier is electrically connected to the first resistor R. The negative power supply VSS pin of the voltage generator, the power interface PAD1 pin of the power generator, and the negative power supply VSS pin are electrically connected to the second pad. The first resistor R is electrically connected to the second pad.

[0010] The simplified dual-pin constant current IC circuit structure, through the design of adjusting current by MOSFET switching and forming a feedback loop with amplifier and resistor, provides the foundation for constant current control and wide voltage withstand capability, adapts to the driving requirements of LED strip loads, and balances functional integrity and ease of application.

[0011] Furthermore, the MOSFETs are configured in five groups, which are connected in parallel to the first pad and the output OUT pin of the amplifier. This can increase the overall current carrying capacity by shunting, meeting the wide range of current output requirements from 3 to 120mA. The parallel structure can reduce the power consumption and heat generation of a single MOSFET, and improve the stability and lifespan of the circuit.

[0012] Furthermore, a second resistor is electrically connected between the negative input IN_P pin of the amplifier and the first resistor R, which reduces the current fluctuation of the lamp strip load, improves the uniformity of light efficiency, and adapts to the current requirements of different load specifications, thereby enhancing the versatility of the dual-pin constant current IC.

[0013] Furthermore, the positive input IN_P pin, voltage adjustment pin VP, and positive voltage VBP pin of the amplifier are connected to the voltage generator to ensure that the amplifier obtains a stable reference voltage and bias signal, ensuring that the amplifier operates in the optimal linear amplification state, reducing current regulation errors caused by voltage fluctuations, improving the stability of constant current performance, and providing a continuous and stable drive current for the LED strip.

[0014] Furthermore, the amplifier's voltage adjustment pin VP and negative voltage pin VBN are connected to the power generator to meet the amplifier's operating requirements within a wide voltage range of 3 to 50V, optimize the amplifier's power consumption and output capability, ensure that it can stably drive the load under different input voltages, and enhance the voltage adaptability of the dual-pin constant current IC.

[0015] Furthermore, the negative power supply VSS pin of the amplifier is electrically connected to the second pad to ensure that the ground potential of the amplifier is consistent with the ground potential of the load circuit, so as to avoid interference signals caused by the potential difference between the two grounds and affect the current regulation accuracy.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The dual-pin constant current IC integrates the voltage generator, power generator, amplifier, MOSFET, and other functions into one design, reducing the power supply, feedback, and drive functions to two pins, simplifying the PCB layout and peripheral circuit complexity. The dual-pin design avoids the problem of crosstalk between multiple pins, and reduces the current fluctuation caused by signal crossover in high-density LED arrays, ensuring the uniformity of light efficiency.

[0018] (2) The dual-pin constant current IC package is smaller in size, which is suitable for compact scenarios such as ultra-thin lamps and flexible light strips. The reduction of pins directly reduces the risk of poor soldering and poor contact, and meets the miniaturization requirements of light strips. Attached Figure Description

[0019] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example:

[0022] Please see Figure 1 This utility model provides a technical solution: a dual-pin constant current IC, including a voltage generator (U3), wherein the voltage generator has a low-voltage power supply LVDD pin, a positive voltage VBP pin, a negative power supply VSS pin, and a voltage output VGEN pin;

[0023] A power generator (U4) has a power interface pin PAD1, a negative power supply pin VSS, a low voltage power supply pin LVDD, and a negative voltage pin VBN. The power interface pin PAD1 is electrically connected to a first pad (PAD1).

[0024] An amplifier (U0) is electrically connected to a voltage generator and a power generator, which together form a power generation module for the amplifier, providing low-voltage power and negative voltage to the amplifier. The amplifier delivers power to the MOS transistor and is used to control the current of the LED strip.

[0025] The MOSFETs are arranged in several groups, and the groups of MOSFETs are electrically connected to the PAD1 pin of the power interface and the OUT pin of the amplifier. The MOSFETs are electrically connected to the first pad, and the right MOSFET is electrically connected to the first resistor R. The groups of MOSFETs adjust the current through their own switching, which can provide the current required by the LED strip.

[0026] The negative input IN_P pin of the amplifier is electrically connected to the first resistor R. The negative power supply VSS pin of the voltage generator and the power interface PAD1 pin of the power generator are electrically connected to the second pad (PAD2). The first resistor R is electrically connected to the second pad.

[0027] The dual-pin constant current IC is soldered onto the circuit board via the first and second solder pads, making soldering convenient and quick.

[0028] In this embodiment, as Figure 1 As shown, five groups of MOSFETs are configured, and the five groups of MOSFETs are connected in parallel to the first pad and the output OUT pin of the amplifier. The output current can be adjusted by turning the five groups of MOSFETs on and off, and the current supply of the LED strip is met by the parallel current splitting method.

[0029] In this embodiment, as Figure 1 As shown, a second resistor is electrically connected between the negative input IN_P pin of the amplifier and the first resistor R. The second resistor reduces circuit fluctuations, ensures that voltage changes on the first resistor are stably detected by the amplifier, and improves the stability of the amplifier's operation.

[0030] In this embodiment, as Figure 1 As shown, the positive input IN_P pin, voltage adjustment pin VP, and positive voltage VBP pin of the amplifier are connected to the voltage generator. The positive input IN_P pin is connected to the voltage output VGEN pin of the voltage generator. The voltage adjustment pin VP is connected to the low-voltage power supply LVDD pin of the voltage generator. The positive voltage VBP pin is connected to the positive voltage VBP pin of the voltage generator.

[0031] In this embodiment, as Figure 1 As shown, the voltage adjustment pin VP and the negative voltage pin VBN of the amplifier are connected to the power generator. The voltage adjustment pin VP is connected to the low-voltage power supply LVDD pin of the power generator, and the negative voltage pin VBN is connected to the negative voltage pin VBN of the power generator.

[0032] In this embodiment, as Figure 1 As shown, the negative power supply VSS pin of the amplifier is electrically connected to the second pad, and the negative power supply VSS pin of the MOSFET is also connected to the second pad. The negative power supply VSS pins of the power generator and voltage generator are also connected to the second pad.

[0033] Specifically, in use, the dual-pin constant current IC uses an amplifier as its core, working in conjunction with a voltage generator, a power generator, and a first resistor to achieve constant current control of the LED strip, ensuring uniform light efficiency and a low defect rate.

[0034] Voltage generation and power supply: The voltage generator provides a stable reference voltage for the amplifier, ensuring that the amplifier operates in a stable state;

[0035] The power generator provides power (LVDD, VDD) and ground (VBN, VSS) to the entire circuit, ensuring the circuit's energy supply;

[0036] Amplifier constant current control: The amplifier achieves constant current output through negative feedback. The negative input IN_P pin of the amplifier is connected to the LED strip (first pad) through the voltage output VGEN pin of the voltage generator. The LED strip current is fed back to the negative voltage VBN pin of the amplifier through the first resistor R (MINUS pin).

[0037] When the LED strip current changes, the voltage change on the first resistor R is detected by the amplifier. By adjusting the output voltage of the output OUT pin, the amplifier controls the five groups of MOSFETs to turn on or off, thereby adjusting the LED strip current in real time and stabilizing the current within the set range to ensure stable operation of the LED strip.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-pin constant current IC, characterized in that, include: A voltage generator having a low-voltage power supply LVDD pin, a positive voltage VBP pin, a negative power supply VSS pin, and a voltage output VGEN pin; A power generator has a power interface pin PAD1, a negative power supply pin VSS, a low voltage power supply pin LVDD, and a negative voltage pin VBN. The power interface pin PAD1 is electrically connected to a first pad. An amplifier, which is electrically connected to a voltage generator and a power generator; The MOS transistors are arranged in several groups, and the groups of MOS transistors are electrically connected to the PAD1 pin of the power interface and the OUT pin of the amplifier. The MOS transistors are electrically connected to the first pad, and the right MOS transistors are electrically connected to the first resistor R. The current of the groups of MOS transistors is adjusted by their own switching. The negative input IN_P pin of the amplifier is electrically connected to the first resistor R. The negative power supply VSS pin of the voltage generator and the power interface PAD1 pin of the power generator are electrically connected to the second pad. The first resistor R is electrically connected to the second pad.

2. The dual-pin constant current IC according to claim 1, characterized in that: Five groups of MOSFETs are configured, and the five groups of MOSFETs are connected in parallel to the first pad and the output OUT pin of the amplifier.

3. The dual-pin constant current IC according to claim 1, characterized in that: A second resistor is electrically connected between the negative input IN_P pin of the amplifier and the first resistor R.

4. The dual-pin constant current IC according to claim 1, characterized in that: The amplifier's positive input IN_P pin, voltage adjustment pin VP, and positive voltage VBP pin are connected to the voltage generator.

5. A dual-pin constant current IC according to claim 1, characterized in that: The amplifier's voltage adjustment pin VP and negative voltage pin VBN are connected to the power generator.

6. A dual-pin constant current IC according to claim 1, characterized in that: The negative power supply VSS pin of the amplifier is electrically connected to the second pad.

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