LMR51430: VIN is lower than the voltage set on FB

Shoji Murata

Part Number: LMR51430

I am currently designing a customer's circuit. If VIN is lower than the voltage set on FB, is it okay to think that VOUT will be output at around VIN x 0.95? Also, will any problems occur if I continue to use it in this condition? please teach me.

3 months ago

0 Marshall_Beck 3 months ago

TI__Mastermind 30430 points

Hello, the duty cycle is ~95% max. So Vout will be 95% of Vin, minus the additional voltage drop across the power FET and buck inductor (related to ouput current).

It is an acceptable use-case to use the device in this fashion.

+1 Shoji Murata 3 months ago

Prodigy 10 points

Hello, thank you for the very helpful information.

0 Marshall_Beck 3 months ago in reply to Shoji Murata

TI__Mastermind 30430 points

You are welcome. Glad to help.

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LMR51430: VIN is lower than the voltage set on FB