R5 is only there to help me measure current consumption from the V2 power source, but in a real circuit it would help to isolate much of the circuit from the few-amp switching transients in and out of C1. Switching (in simulated form) is speedy and clean With a turn off transistor installed, R3, the resistor that used to do the job now done by Q4 can be increased to reduce overall power consumption, and R4 can be a low value as it is only used briefly each cycle.
As before, capacitor C1 represents the gate of a p- mosfet power switch.Īs with the Cuk version, its base is driven via a capacitor with a diode to stop the capacitor just charging to the rail voltage and taking no further part in proceedings.
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