With buck or boost drivers, is Moon mode typically still driven by them or is it a separate FET/PWM channel?
Yes.
The better ones have 2 or 3 sense resistors, often referred to as “gears” for added resolution.
With these additional “gears” they can achieve lower lows.
3 Thanks
Cool, on this “multi-gear” configuration are the shunts connected in series?
No, they are connected in parallel and turned on/off via a FET.
1 Thank