POWER ON ETHERNET USING MP8008

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Sharath_giagbit1000

Joined Aug 8, 2020
1
Hello,

i was working on power on Ethernet section on ROCK PI 4 board. i'm using monolithic power's MP8008 ― IEEE, 802.3af/at POWER DEVICE WITH FLYBACK CONTROLLER maximum input from POE is 45V and i have adulator option with 12V i have attached schematics. i have a mosfet for switching Q1 when ever i power on with 12V dc i can see 12V at drain pins but there is no gate voltage hence the MOSFET is not getting switched and there is no feedback and no output after the transformer(T1).... kindly help me am i missing anything in my design ...!

Regards
Sarath
 

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