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how I can compensate for this 0.4V power loss

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EDA_hg81

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My idea is the input 12V can be controlled to realize power on sequence.

Why the output voltage at “out” node only can reach 11.4V?

I need 11.8V at least how I can compensate for this 0.4V loss.

Thanks..
 

EDA_hg81

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Thank you, please give me a little more detail.

I fixed this, the values of feedback network is wrong.
 

dick_freebird

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If the gate is fully driven to ground (or max rated Vgs)
then it must be a MOSFET on-resistance vs load current
problem. But you'd have to inspect for that to be sure.
If so, then spec a MOSFET whose RON at your load current
gives you less than the max allowed voltage drop.

Seeing "MOSFET-P" as the device callout makes me think
you are using a small-signal MOSFET where a proper
power MOSFET is really wanted. Go to IR's website and
pick off one you like the looks of.
 

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