TPS92691-Q1: Gate pin activated when energizing Vin pin

Killyon Pereira

Part Number: TPS92691-Q1

Tool/software:

I have a problem where the gate pin is activated as soon as only the Vin pin is supplied with 13V. Has anyone had a similar problem?

Thanks

over 1 year ago

0 Tuan Tran74 over 1 year ago

TI__Mastermind 18890 points

Hello,

The gate pin will start to operate if PWM is high and as soon as you have Vin above the threshold of 6.5V and after soft-start timing.

Thanks Tuan

0 Killyon Pereira over 1 year ago in reply to Tuan Tran74

Prodigy 10 points

The GATE pin is being activated even with the IADJ pin at level 0.
Below is an image of the circuit.

We assembled 200 pieces and 25 pieces presented this problem.

0 Tuan Tran74 over 1 year ago in reply to Killyon Pereira

TI__Mastermind 18890 points

Hello

We can only guarantee current control of IADJ from 140mV to 2.25V. So what you are seeing is correct. There will be parts that will switch because of offset in the system controlling with IADJ below the 140mV specified in the specification.

The only way proper way to disable the part from switching is pulling down the SS pin with an open collector/Drain of a transistor.

Thanks Tuan

Power management

Power management forum

TPS92691-Q1: Gate pin activated when energizing Vin pin