LED drive control circuit

Abstract

The invention provides an LED drive control circuit suitable to the technical field of lighting circuits, which comprises a singlechip, an audion, an MOS (Metal Oxide Semiconductor) tube, a power inductor and a constant current integrated chip, wherein a power input pin and a power output pin of the singlechip are respectively connected with the anode and the cathode of a power input end; the base electrode of the audion is connected with the singlechip, and the emitting electrode of the audion is connected with the cathode of the power input end; the grid electrode of the MOS tube is connected with the collector electrode of the audion through a divider resistor, and the source electrode of the MOS tube is connected to the anode of the power input end; one end of the power inductor is connected with the drain electrode of the MOS tube, the other end of the power inductor is connected with the anode of a diode, and the cathode of the diode is connected to the anode of an LED; a working enable pin of the constant current integrated chip is connected with the singlechip, a feedback pin of the constant current integrated chip is connected to the cathode of the LED for sampling current, and a power pin is connected to a node arranged between the power inductor and the anode of the diode. The LED drive control circuit is realized by adopting the constant current integrated chip with low cost and high efficiency, can ensure stable and reliable work of the LED, and has very simple structure.

Description

technical field [0001] The invention belongs to the field of lighting circuits, in particular to an LED driving control circuit. Background technique [0002] With the continuous development of science and technology, new products and new technologies are constantly innovating. As a new type of light source, LED has the characteristics of energy saving, environmental protection and high efficiency. There are also various LED drive circuits. At present, DC-DC chopping technology is used to drive LED in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, small size per unit power, light weight, etc., but its cost is high, the circuit is complicated, and easy to use. Damage, strong high-frequency interference and other shortcomings have brought inconvenience to users. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide an LED driving control circuit, aiming to sa...

AI Technical Summary

Problems solved by technology

At present, DC-DC chopping technology is used to drive LED in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, small size per unit power, light weight, etc., but its cost is high, the circuit is complicated, and easy to use. Damage, strong high-frequency interference and other shortcomings, which bring inconvenience to users

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