BQ7718: Ground Disconnect during Fault Event

Keith Keller

Expert 6550 points

Part Number: BQ7718

Tool/software:

Hello,

We need to use a power MOSFET to block over-charge, but allow discharge.

To accomplish this, we need to disconnect the ground of the BQ7718 in fault condition.

Will this work? Or could it damage the IC? (schematic provided)

Thank you, Keith

2 months ago

0 Thomas Rainey 2 months ago

TI__Expert 4320 points

Hello Keith,

This might work, however it is not recommended to float the VSS pin during operation. It is not a condition that has been tested before and the device could behave unexpectedly.

Best regards,

Thomas Rainey

0 Keith Keller 2 months ago in reply to Thomas Rainey

TI__Expert 6550 points

Hello,

Will this circuit work instead using an opto-coupler?

Thank you, Keith

0 Thomas Rainey 2 months ago in reply to Keith Keller

TI__Expert 4320 points

Hello Keith,

It looks like it could work.

Best regards,

Thomas Rainey

Power management

Power management forum

BQ7718: Ground Disconnect during Fault Event