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lt8316 - Output Voltage Drop

Category: Hardware
Product Number: LT8316

Hello Everyone, hope everything is good with you.

I am designing a voltage regulator, identical to DC2781A.

I just changed the MOSFET, I am using STD6N90K5 from STMicroelectronics.

I have designed the PCB and it worked, at least it managed to get a stable output with a load of 1mA (board LED). However, if I plug more load it just drops:

- 10k resistor made the output fall to 7V

-1k resistor made the output fall to 1.7V

Do you have any idea of what could it be?

I already have tested the board up to 550V and it kept the output well regulated with the LED.

My PCB is open to everyone since it is used for a Formula Student, so if better, you can check the Altium design here (Release v2.0.0):

Circuit Below:

PCB Below: