One-touch switching power supply circuit

Published:2014/3/27 21:24:00 Author:lynne | Keyword: One-touch switching power supply circuit | From:SeekIC

This circuit can be applied to a wide range of voltages (4.5V ~ 40V, the maximum current of 19A ), R5 is optional , when the input voltage is less than 20V can be short-circuited ; greater than the input voltage by connecting the 20V, R5 values R1 should meet with the partial pressure of the MOS GS voltage of V1 is less than greater than -20V -5V ( V2 when conduction ) as possible, the voltage V1 at the GS between ~-20V -10V so that a large current output V1 .Before the button is pressed , GS voltage V2 (ie C1 voltage ) is zero , V2 deadline , V1 , GS voltage is 0, V1 cut no output ; When you press S1, C1 charging , V2 GS voltage rises to about 3V when V2 guide pass and quickly saturated , V1 GS voltage is less than -4V, V1 saturated conduction , Vout with output, LED light ( and you should release the button ) C1 through R2, R3 continue to charge , V1, V2 state is locked ; when pressed again The next button , because V2 is saturated conduction state, the drain voltage of approximately 0V, C1 discharges through R3 , when put to approximately 3V , V2 deadline , V1 gate-source voltage is greater than -4V, V1 cut , Vout no output , LED tube off ( release button ), C1 through R2, R3 , and continues to be discharged outside of the circuit , V1, V2 to maintain the off state.Note : S1 makes Vout should be open or closed after the button is released , or will form the switching oscillation.One-touch switching power supply circuit shown in Fig.



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