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Low dropout output current overshoot suppression circuit

A technology of output current and suppression circuit, which is applied in the direction of electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of low-voltage dropout output current overshoot, etc., and achieve the effect of improving system reliability

Active Publication Date: 2019-04-30
SHENZHEN OCX SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional circuit does not solve the problem of low dropout output current overshoot

Method used

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  • Low dropout output current overshoot suppression circuit
  • Low dropout output current overshoot suppression circuit
  • Low dropout output current overshoot suppression circuit

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Embodiment Construction

[0025] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below, and are described in detail in conjunction with the accompanying drawings.

[0026] The following takes an LED constant current drive circuit based on a fixed TOFF (fixed off time) and a fixed peak current as an example to illustrate the principle of low dropout overshoot. Figure 6 is the complete circuit diagram of LED driver circuit with fixed TOFF and fixed peak current control. The LED drive circuit with fixed TOFF and fixed peak current control includes LED loads D1, D2, inductor L, freewheeling diode D3, MOS switch Q, power supply resistor R11, filter capacitor C11, TOFF time setting capacitor C12, and peak current setting resistor R12, fixed TOFF and fixed peak current integrated circuit U. The fixed TOFF and fixed peak current integrated circuit U includes a power input pin VDD, an off-time setting pin TOFF...

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PUM

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Abstract

The invention provides a low-dropout output current overshoot suppression circuit, which is applied to an LED constant current drive circuit, the LED constant current drive circuit includes a power tube drive circuit, and the low dropout output current overshoot suppression circuit includes a limiter a circuit, wherein the limiting circuit is electrically connected to the power tube driving circuit to suppress the output current overshoot in the LED constant current driving circuit. The low dropout output current overshoot suppression circuit solves the output current overshoot problem of the traditional open-loop constant current control circuit when the input and output voltages are close, improves the system reliability, and the scheme is simple and easy to implement.

Description

technical field [0001] The invention relates to the field of electronic technology products, in particular to a low-dropout output current overshoot suppression circuit. Background technique [0002] The open-loop control LED constant current drive circuit has the advantages of simple circuit structure and fast response speed, so it is widely used. For example, the LED constant current drive circuit based on hysteresis control such as figure 1 , LED constant current drive circuit based on fixed TOFF and fixed peak current figure 2 . figure 1 Among them, the traditional hysteresis control constant current drive circuit includes an inductor current detection circuit 11 , a voltage reference source circuit 12 , a hysteresis window control circuit 13 and a power tube drive circuit 14 . figure 2 Among them, the traditional fixed TOFF and fixed peak current constant current drive circuit includes an inductor peak current control circuit 21 , an off-time control circuit 22 , a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 李永红郑庆华杨龙飞吴清虎
Owner SHENZHEN OCX SEMICON CO LTD