TPS650332-Q1: PSRR graph for the buck regulators and the maximum ripple allowed at the input

Muthugomathi S

Part Number: TPS650332-Q1

Tool/software:

Please share the PSRR graphs for Buck 1, 2 and 3. Also share the value of maximum allowed ripple at the input of all the bucks and LDO (PVIN_B1, PVIN_B2, PVIN_B3 and PVINLDO).

Kindly share the PDN for reference.

over 1 year ago

0 Phil Yi over 1 year ago

TI__Mastermind 48891 points

Hi Muthugomathi,

PSRR usually apply to LDO only not to any BUCKs.

The value of maximum allowed ripple at the input of all the bucks is to make sure the input is in this range: VINmin>UVLO_fall (set by NVM) for BUCK1 and 2.5V for Bcuk2 and3; and VINmax<18.3V for BUCK1 and 5.5V for Bcuk2 and3.

Thanks!

Phil

0 Muthugomathi S over 1 year ago in reply to Phil Yi

Prodigy 20 points

Thanks for your response.

Actually we are using the buck output for analog power supplies. That is why we need the ripple rejection ability of the bucks.

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TPS650332-Q1: PSRR graph for the buck regulators and the maximum ripple allowed at the input