LM5123-Q1: Internal offset

Kian Lin

Intellectual 1710 points

Part Number: LM5123-Q1

Hi,

I have a question about why we need the offset voltage 0.3V between TRAMPS and PWM comparator? What's this voltage for?

Thanks!

over 1 year ago

0 Brigitte over 1 year ago

TI__Guru 58215 points

Hello Kian,

Just an offset to get some headroom for the comparator.

Best regards,
Brigitte

0 Kian Lin over 1 year ago in reply to Brigitte

TI__Intellectual 1710 points

Hi Brigitte,

Thanks for your reply.

What's the headroom for? Give time for output capacitor charging through high-side FET diose? I was curious about the real benefits about this offset.

Thanks

Kian

+1 Brigitte over 1 year ago in reply to Kian Lin

TI__Guru 58215 points

Hello Kian,

Measuring a signal that is somewhat away from GND is easier and more accurate.

Best regards,
Brigitte

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LM5123-Q1: Internal offset