On Tue, Dec 13, 2016 at 12:00:32PM -0800, Doug Anderson wrote: > On Tue, Dec 13, 2016 at 9:19 AM, Mark Brown <broonie@xxxxxxxxxx> wrote: > > 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. > As you can see from the datasheet ("Adjusting the Output Voltage" > section), it is intended that you stuff a resistor to make a voltage > divider and that's how you select the output voltage. In our case the OK, that's what I thought was happening. That's definitely something that should *not* end up in ->supply, that should hold the parent supply that the DCDC is regulating down to the target voltage.
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