Hi,
I'm trying to get a VRM board to power up outside of it's enclosure so it can be reused for other purposes. The main control chip is an IR3500 and I am having problems getting the chip to fully enable. I have sent an enable signal to the pin, wired the feedback and biased the VRHOT and VRRDY pins as well as set up the VID and VIDSEL, however upon power up all I am getting is 0.18V on the output. Any ideas as to why the chip isn't fully starting up would be greatly appreciated.
Cheers.