LED constant current drive chip and device, and LED lamp
A technology for constant current driving chips and LED light strings, applied in lighting devices, light sources, electrical components, etc., can solve the problems of color temperature adjustment and brightness adjustment of LED light strings not being controlled by power switches, and inaccurate detection of power-off times.
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[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
[0022] The embodiment of the present invention adopts LED constants including a first power-off detection module, a second power-off detection module, a cycle counter, a codec module, a pulse width modulation module, a first constant current drive module, and a second constant current drive module. The current drive chip is determined by the first power-off detection module when it detects that the conduction time of the first switch tube reaches the preset maximum conduction time, and the turn-off time of the first switch tube is less than the preset overvoltage protection shutdown time The p...
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