LM27222: LEN High Side FET

Mark Ackerson

Part Number: LM27222

The LM27222 LEN pin disables turn on of the low side FET. Is the high side FET drive still enabled and controlled by the PWM input? Operation is not explicitly stated in the data sheet.

Thanks,
Mark

over 3 years ago

0 Richard Herring over 3 years ago

TI__Mastermind 20950 points

Hello Mark,

The LEN pin input is a disable/enable for the low side driver output. The PWM will control the high side driver output. With a single PWM input, a low on PWM results in the low side driver high, there may be some conditions such as DCM operation or system shutdown where you desire both driver outputs to be low. The LEN signal allows for this driver output state.

Confirm if this addresses your questions, or you can post additional questions on this thread.

Regards,

0 Mark Ackerson over 3 years ago in reply to Richard Herring

TI__Genius 10190 points

Thanks for confirming Richard.

Regards,
Mark

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LM27222: LEN High Side FET