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Switch regulator power supply circuit diagram made by three-

2015-03-22 13:48  
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Switch regulator power supply circuit diagram made by three-terminal regulator
Switch regulator power supply circuit diagram made by three-terminal regulator
Equivalent circuit of switching regulator power supply: Switch regulator power supply circuit diagram made by three-terminal regulator is shown as above. Itsworking principle can be read through the equivalent circuit diagram. The output voltage VO declines a little because of some reasons. The partial pressure V3 on R5 and R6 also declines. It is enlarged by VT3, then Ic3 minishes, Ic2 increases, the current passing R1 and VD1 increases, V1 declines. It makes Ic1 increase, V4 rise, V4 passing the partial voltage of R2 and R3, V2 increase and V3 decline. The process is a reaction of positive chain feedback. Finally VT1 and VT2 are conducted, VT3 stops, Ic1 charges to L1 and C1. It makes Vo increase gradually.