> Your Rsc of 0.1 ohms.  What voltage are you seeing across that?

11.1mV when the circuit is loaded, 0mV otherwise

> What resistance when not powered?

It's a new one so I'd assume 0R1. I've not got a low ohms meter
to prove it

> Does current change downwards by the right amount with an Rsc
> of 0.12 ohms?

Have to get back you on that
=20
> Manufacturer of the MC34063 you are using?  They vary

I've got at least one other brand to try, will get back on that too


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