Double-pin constant current IC

Abstract

A double-pin constant current IC disclosed by the present invention comprises a voltage generator, a power generator, an amplifier and MOS transistors, the amplifier is electrically connected with the voltage generator and the power generator, a plurality of groups of MOS transistors are electrically connected to a power interface PAD1 pin and an output OUT pin of the amplifier, the MOS transistors are electrically connected with a first bonding pad, the MOS transistor on the right side is electrically connected with a first resistor R, and the MOS transistor on the right side is electrically connected with a second resistor R; a negative input INP pin of the amplifier is electrically connected with the first resistor R, a negative power supply VSS pin of the voltage generator and a power supply interface PAD1 pin of the power supply generator are electrically connected with a second bonding pad, and the first resistor R is electrically connected with the second bonding pad; according to the double-pin constant-current IC, the voltage generator, the power generator, the amplifier and the MOS tube are integrally designed together, the problem of multi-pin signal crosstalk is avoided through double pins, current fluctuation caused by signal crossing is reduced, the lighting effect uniformity is guaranteed, the packaging size of the double-pin constant-current IC is smaller, and the double-pin constant-current IC is suitable for compact scenes such as ultrathin lamps and flexible lamp strips.

Description

Technical Field

[0001] The present invention relates to the technical field of light strips, in particular to a double-pin constant current IC. Background Art

[0002] Currently, constant-current ICs use built-in current regulation to ensure constant output current when the LED strip varies with voltage or load. This effectively prevents flickering or intermittent brightness caused by voltage fluctuations. Constant-current ICs also limit the maximum current, preventing excessive heating caused by overcurrent in the LED strip.

[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 also the internal circuits of constant current ICs are relatively complex. 3-pin and 5-pin constant current ICs are large in size and difficult to adapt to compact scenes such as ultra-thin lamps and flexible light strips. In high-density LED light strips, there is a problem of multi-pin signal crosstalk. The current fluctuations caused by signal crosstalk affect the uniformity of the light effect of the light strip. Summary of the Invention

[0004] The object of the present invention is to provide a two-pin constant current IC to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a two-pin constant current IC, comprising 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, the power generator having a power interface PAD1 pin, a negative power supply VSS pin, a low voltage power supply LVDD pin, and a negative voltage VBN pin, wherein the power interface PAD1 pin is electrically connected to a first pad;

[0007] an amplifier electrically connected to the voltage generator and the power generator;

[0008] MOS transistors, wherein the MOS transistors are provided in a plurality of groups, and the plurality of groups of MOS transistors are electrically connected to the power interface PAD1 pin and the output pin OUT of the amplifier. The MOS transistors are electrically connected to the first pad, and the right MOS transistor is electrically connected to the first resistor R. The plurality of groups of MOS transistors adjust current through their own switches;

[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 and the power interface PAD1 pin and the negative power supply VSS pin of the power generator are electrically connected to a second pad, and the first resistor R is electrically connected to the second pad;

[0010] The circuit structure of the two-pin constant current IC is simplified. The current is adjusted by the MOS tube switch, and the amplifier and resistor form a feedback loop. This design provides a basis for constant current control and wide voltage resistance, adapts to the driving requirements of the light strip load, and takes into account both functional integrity and application convenience.

[0011] Furthermore, the MOS tubes are arranged in five groups, and the five groups of MOS tubes are connected in parallel to the first pad and the output OUT pin of the amplifier. The overall current carrying capacity can be increased by shunting, meeting the wide range current output requirements of 3 to 120 mA. The parallel structure can reduce the power consumption and heat generation of a single MOS tube, and improve the working stability and service life 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 light strip load, improves the uniformity of the lighting effect, and adapts to the current requirements of loads of different specifications, thereby enhancing the versatility of the two-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 correspondingly connected to the voltage generator to ensure that the amplifier obtains a stable reference voltage and bias signal, ensures that the amplifier operates in the optimal linear amplification state, reduces the current control error caused by voltage fluctuations, improves the stability of the constant current performance, and provides a continuous and stable driving current for the light strip.

[0014] Furthermore, the voltage adjustment pin VP and the negative voltage VBN pin of the amplifier are correspondingly connected to the power generator, meeting the working requirements of the amplifier within a wide voltage range of 3 to 50V, optimizing the power consumption and output capacity of the amplifier, ensuring that it can stably drive the load under different input voltages, and enhancing 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, thereby avoiding interference signals generated due to the potential difference between the two grounds and affecting the current control accuracy.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The two-pin constant current IC integrates the voltage generator, power generator, amplifier, MOS tube, and other functions into one, reducing the power supply, feedback, drive and other functions to two pins, simplifying the PCB layout and the complexity of the peripheral circuit. The two pins avoid the problem of multi-pin signal crosstalk. In high-density LED arrays, it reduces the current fluctuation caused by signal crosstalk and ensures the uniformity of light effect.

[0018] (2) The two-pin constant current IC package is smaller in size and is suitable for compact scenes such as ultra-thin lamps and flexible light strips. The reduction in pins directly reduces the risk of cold soldering and poor contact, meeting the demand for miniaturization of light strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example:

[0022] See also Figure 1 , the present invention provides a technical solution: a two-pin constant current IC, comprising 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), the power generator having a power interface PAD1 pin, a negative power supply VSS pin, a low voltage power supply LVDD pin, and a negative voltage VBN pin, the power interface PAD1 pin being electrically connected to a first pad (PAD1);

[0024] An amplifier (U0), the amplifier being electrically connected to a voltage generator and a power generator, the voltage generator and the power generator forming a power generation module for the amplifier, providing the amplifier with a low-voltage power supply and a negative voltage, the amplifier delivering power to the MOS tube and being used to control the current of the light strip;

[0025] MOS tubes, wherein the MOS tubes are provided in several groups, and the groups of MOS tubes are electrically connected to the power interface PAD1 pin and the output pin OUT of the amplifier. The MOS tubes are electrically connected to the first pad, and the right MOS tube is electrically connected to the first resistor R. The groups of MOS tubes adjust the current through their own switches to provide the current required by the light 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 and the negative power supply VSS pin of the power generator are electrically connected to a second pad (PAD2), and the first resistor R is electrically connected to the second pad;

[0027] The two-pin constant current IC is soldered to the circuit board through the first soldering pad and the second soldering pad, and the soldering is convenient and quick.

[0028] In this embodiment, if Figure 1 As shown, the MOS tubes are arranged in five groups, and the five groups of MOS tubes are connected in parallel to the first pad and the output OUT pin of the amplifier. The five groups of MOS tubes can be turned on and off to adjust the output current, and the current supply of the light strip is met according to the parallel shunt method.

[0029] In this embodiment, if 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 the voltage change on the first resistor is stably detected by the amplifier, and improves the stability of the amplifier operation.

[0030] In this embodiment, if Figure 1 As shown, the positive input IN_P pin, voltage regulation pin VP, and positive voltage VBP pin of the amplifier are correspondingly 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 regulation pin VP is connected to the low voltage power supply LVDD pin of the voltage generator, and the positive voltage VBP pin is connected to the positive voltage VBP pin of the voltage generator.

[0031] In this embodiment, if Figure 1 As shown, the voltage adjustment pin VP and the negative voltage VBN pin of the amplifier are correspondingly 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 VBN pin is connected to the negative voltage VBN pin of the power generator.

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

[0033] Specifically, when in use, the dual-pin constant current IC uses the amplifier as the core, combined with the voltage generator, power generator and the first resistor to work together to achieve constant current control of the light strip, ensuring uniform lighting efficiency and low defective rate;

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

[0035] The power generator provides power (LVDD, VDD) and ground (VBN, VSS) for the entire circuit to ensure the energy supply of the circuit;

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

[0037] When the current of the light strip changes, the voltage change on the first resistor R will be detected by the amplifier. By adjusting the output voltage of the output OUT pin, the amplifier controls the five groups of MOS tubes to turn on or off, and adjusts the current of the light strip in real time to stabilize the current within the set range and ensure stable operation of the light strip.

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

Claims

1. A two-pin constant current IC, characterized in that: include: 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; A power generator, the power generator having a power interface PAD1 pin, a negative power supply VSS pin, a low voltage power supply LVDD pin, and a negative voltage VBN pin, wherein the power interface PAD1 pin is electrically connected to a first pad; an amplifier electrically connected to the voltage generator and the power generator; MOS transistors, wherein the MOS transistors are provided in a plurality of groups, and the plurality of groups of MOS transistors are electrically connected to the power interface PAD1 pin and the output pin OUT of the amplifier. The MOS transistors are electrically connected to the first pad, and the right MOS transistor is electrically connected to the first resistor R. The plurality of groups of MOS transistors adjust current through their own switches; 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 and the negative power supply VSS pin of the power generator are electrically connected to the second pad, and the first resistor R is electrically connected to the second pad.

2. A two-pin constant current IC according to claim 1, characterized in that: The MOS tubes are provided in five groups, and the five groups of MOS tubes are connected in parallel to the first pad and the output OUT pin of the amplifier.

3. A two-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. A two-pin constant current IC according to claim 1, characterized in that: The positive input IN_P pin, the voltage adjustment pin VP, and the positive voltage VBP pin of the amplifier are correspondingly connected to the voltage generator.

5. A two-pin constant current IC according to claim 1, characterized in that: The voltage regulating pin VP and the negative voltage pin VBN of the amplifier are correspondingly connected to the power generator.

6. A two-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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