UCC28251: UCC28251 Synchronous rectifier PWM shutoff mechanism

Robin Liu

Intellectual 1930 points

Part Number: UCC28251

Hi all,

These is a customer asked, how to control the UCC28251 Synchronous rectifier PWM shutoff mechanism when light load.

could you help?

Regards

Robin Liu

over 7 years ago

0 Benjamin Lough over 7 years ago

TI__Mastermind 27105 points

Hi Robin,

Thanks for your interest in UCC28251. The SR logic in UCC28251 is only disabled when the IC itself is disabled unfortunately. What gate driver is your customer using? one possible option is to use an external gate driver with an enable pin. You could disable the gate driver vias the enable pin with an external signal when in light load.

Best Regards,
Ben Lough

0 Robin Liu over 7 years ago in reply to Benjamin Lough

TI__Intellectual 1930 points

Hi Ben,

Thanks very much for your response, I think this can help to customer question.

Regards
Robin Liu

Power management

Power management forum

UCC28251: UCC28251 Synchronous rectifier PWM shutoff mechanism