Current resonance converter circuit diagram composed of NE555

Published:2012/7/3 22:13:00 Author:Ecco | Keyword: Current resonance converter | From:SeekIC

Figure 21 shows the current resonance converter circuit diagram composed of NE555. In the circuit, NE555 is the voltage controlled oscillator. MOSFET (VT1 ), freewheeling diode VD2 and smoothing inductor L1 constitute a common step-down DC / DC converter. L2 and C1 form the resonant circuit, VD2 is a diode to realize half-wave current resonance. VD1 and C3 form the bootstrap circuit to provide gate drive current for the the VT1. Voltage divider resistors R1 , R2 and RP1 are used to detect the output voltage, and the voltage is added to the VT5's base to control the frequency of the NE555. VT3 is the overcurrent protection circuit which can control the output current in the range of 0.5 ~ 3A.



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