ADM7171 EN pin Short to Ground failure mode

Hi wchristensen,

Could you describe how the EN pin is connected, the driving circuit for the EN signal and whether the driver is also located inside the vacuum chamber?

Cheers, heke

Hi wchristensen,

Could you describe how the EN pin is connected, the driving circuit for the EN signal and whether the driver is also located inside the vacuum chamber?

Cheers, heke

Hi heke,

The EN pin is simply driven by being shorted to the VIN and VIN1 pins as we would like startup with power to VIN. The source for VIN is outside of the vacuum chamber if it is important. I did notice that the Soft Start capacitance was incorrectly specified to 4.7uF, instead of 4.7nF I don't expect it to cause any issues but I'll mention it just in case its important.

Best,

Will

Hi Will,

As the EN signal is generated outside the chamber, one could assume that the signal wiring is considerably long. In such case the EN signal is not effectively shorted to VIN, thus would require its own ESD/voltage protection.

Cheers, heke

Hi Heke,

I was unclear on this sorry for that the EN is shorted to the supply pin at the chip not out of vacuum they are connected to the same 6V supply line, I've taken a screen shot of the board files to show how the circuit is laid out on those pins.



Best,

Will