On Mon, Dec 12, 2016 at 01:15:02PM -0800, Matthias Kaehlcke wrote: > El Fri, Oct 28, 2016 at 07:15:21PM +0100 Mark Brown ha dit: > > On Mon, Sep 26, 2016 at 10:41:59AM -0700, Doug Anderson wrote: > > What you're describing to me is a discrete DCDC that has an input > > voltage that sets the output voltage which happens to be set with a PWM. > I experimented a bit with this. Besides the question of how to model > the passives I wonder how the two regulators would interact. The > correct thing seems to be to specify the input regulator as a supply > of the DCDC. dcdc->set_voltage breaks down a voltage transition into No, not unless the prior descriptions of the hardware have been wildly inaccurate - my understanding had been that the DCDC was a normal DCDC with an analogue input intended to be biased to set the output voltage (presumably in terms of a full rail supply) and that the PWM had been connected to this analogue input. If the PWM is supplying the DCDC then the hardware design just seems bizzare, I can't see how this would even work.
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