Drive LED Circuit of Voltage Dropping Model DC／DC Converter

Published:2011/7/23 8:23:00 Author:Michel | Keyword: DC／DC Converter, Drive LED Circuit | From:SeekIC

The dropping voltage model DC/DC converter drive LED circuit is showed as above.In this circuit,DC/DC converter(ZXSC310) works in dropping voltage model.More high system voltage can be provided by increasing the value of the R2 and the R2's value should be changed into 2.2kΩ if we want to get 24V voltage.At the same time capacitance C1 should also need the higher rated voltage. The circuit's basic work principle is as follows.When VT1 turns on, current flows through the white LED, capacitance and inductance L1 C1 .When both ends' voltage of R1 redcue to the threshold voltage of SENSE pin,VT1 shuts off and maintains a fixed time,the current in inductance flows through VZ and white LED.VT1 turns off again after the fixed time and the process repeats again and again. Picture:Drive LED Circuit of Voltage Dropping Model DC／DC Converter



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