LM5020: LM5020 R1 function

Hollis Liu

Intellectual 2595 points

Part Number: LM5020

Hi team,

i would like to know the function of R1 in below REF SCH. To limit I_in or other functions?

What's the current consumption range of Vin Pin in normal case?

Thanks.

over 3 years ago

+1 Richard Fu22 over 3 years ago

TI__Mastermind 31315 points

Hi Hollis,

R1 acts as a low-pass filter with C4 to provide a cleaner input to the VIN pin.

Current draw at the VIN pin will usually go to turning on the MOSFET, so VIN pin will usually consume current equal to the Qg_total*fsw of the MOSFET.

Regards,

Richard

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LM5020: LM5020 R1 function