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maintain 24V at output

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EDA_hg81

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The 24V is output at P1 to 6 ohm load.
There are two 1500UF capacitors for generating 4A surge current.
But the requirements need to maintain 24V during this 20ms period.
Since time constant is around 20ms so if I only use capacitors to supply load, the output voltage is going to drop down to 9.6V after 20ms.
I have to connect 24V to output for maintain 24V during 20ms , after 20ms the P-Mosfet is turned off to disconnect 24V from load.
Do you think it is correct or not?
Thank you for you any suggestions.
 

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