Other Parts Discussed in Thread: PMP10783
Good morning,
I replied to my board the application note PMP10783 Rev A.
When I turned on the board, the power supply works, it stays at 15.5V, but if it loads, it starts to whistle and the output voltage has dropped to 13V. I thought it was a inductor saturation problem (330uH 1,4A as inserted in appnote PMP10783 Rev A) so I replaced it with one larger and in fact the output voltage stays stable on the 15V (consistent with the application's value Notes PMP10783) but the whistle remains.
The heated MOSFET arrives at 110 Celsius degrees with an output current equal to 250mA.
I have verified the gate of the mosfet and there are riarms, what is it for? Did you have the same problems?
King regard
Lorenzo