![]() ![]() Hi-side takes in 12v at lower current so it can be a lower rating mosfet, which poorer characteristics, because it's stays on for shorter periods of time. This way, they can use a cheaper or more mass produced vrm which let's say can only do 4 phases, but use doublers to have 8 phases, spreading the current over more phases / chips and reducing the heat produced per set of components and making the output voltage a bit smootherĪ phase needs a hi-side mosfet, a lo-side mosfet and an inductor. So overall over the duration of that 1/300k or 1/600k you have 11 00 11 11 but not at same time. ![]() So if VRM says 1011 (turn phases 1, 3, and 4 on and turn off phase 2) for the duration of the on / off period (usually 1 / 600 000 or 1 / 300 000 seconds) they'll do this : Doublers take one of the PWM signals from the VRM controller (one PWM signal per phase) and double it, producing TWO PWM signals - often if not almost always opposite to each other (when one pwm signal says turn on, the other pwm signal says turn off)
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