LED constant current control circuit, control method and control chip
The invention provides an LED constant current control circuit, control method and control chip. The LED constant current control circuit comprises a threshold generation circuit, a threshold comparison circuit, a constant-on detection circuit and a first switch. The constant-on detection circuit is...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention provides an LED constant current control circuit, control method and control chip. The LED constant current control circuit comprises a threshold generation circuit, a threshold comparison circuit, a constant-on detection circuit and a first switch. The constant-on detection circuit is used for detecting the working state of the first switch and generating and outputting a threshold adjustment signal according to the working state; the threshold value generation circuit is used for adjusting an output first voltage threshold value according to the threshold value adjusting signal; and the threshold comparison circuit is used for controlling the working state of the first switch according to the adjusted first voltage threshold. According to the LED constant current control circuit, by adjusting the first voltage threshold value, the switching-on and switching-off time of the first switch can be controlled, so that the problem of output current overshoot of an LED load is solved.
本申请提供了一种LED恒流控制电 |
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