Lossless LED drive circuit with 24V power supply

Published:2011/4/19 6:44:00 Author:Nicole | Keyword: LED drive, 24V power supply | From:SeekIC

This circuit adopts LED drive circuit,its choke Dr is matched with 24V power voltage. Using under transistor BC237A as constant current source, in order to let LED current has no relationship with power voltage Us, so the duty tatio should be proportionate to Us. Thus, when the power voltage Us is higher, the duty ratio or the turn on time of transistor will short. In this circuit, in the condition of LED average current is 20mA, the total consumption current is only 3.4mA.



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