TPS22971: Slew rate at turn off of TPS22971

user4699602

Intellectual 570 points

Part Number: TPS22971

We got a question from customer about TPS22971.

They desire slew rate 25mV/μs at turn off.

How is the slew rate determined at turn off?

Thanks.

Sincerely.

over 7 years ago

0 Aleksandras_Kaknevicius over 7 years ago

TI__Genius 15740 points

Hi user,

The turn off slew rate is not controlled by the device. Instead, the MOSFET is shut off in a few microseconds (preventing the output from being powered) and the fall time is dependent on how quickly the output load discharges the output capacitance. Because the current draw of the load is likely fixed, the fall time can be adjusted by modifying the output/load capacitance. Also, the TPS22971 has an internal output pulldown (150Ω) that will contribute to discharging this capacitance.

Thanks,

Alek Kaknevicius

0 user4699602 over 7 years ago in reply to Aleksandras_Kaknevicius

Intellectual 570 points

Hi
Thank you for your support.
What is the load capacitance??

Thanks,

0 Aleksandras_Kaknevicius over 7 years ago in reply to user4699602

TI__Genius 15740 points

Hi user,

The load capacitance is the capacitance at the input of the load. This is tied to the VOUT pin of the load switch.

Thanks,

Alek Kaknevicius

Power management

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TPS22971: Slew rate at turn off of TPS22971