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Problem in LDO simulation

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nguyenvanthien

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Hi everybody,
When I simulate DC ( without compensation circuit), results are very good: Vout =1.2V ( Vg=2.7V; Vfb=0.812V)
but when I add compensation circuit, Vout=3.29V (Vg=20mV; Vfeb=2.3V). Because of failure DC bias , I can't test ac response and adjust copensation circuit to suitable.
(As you know, LDO have to the compensation circuit to stability and transient response).
How can I correct it?
I'm looking forward your answer!
Thank you very much!
 

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Hi,

it seems the box "current amplifier" has it´s output at the left side.
Doesn´t his cause a short to the OPAMP output?

Maybe a resistor is necessary to connect both outputs.

Klaus
 

Dear KlausSt,
Can you post schematic " a resistor is necessary to connect both outputs" or explain more detail? I don't understand clearly.
Thank you very much!
 

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