TPS2553: Internal shunt resistance

Hirotsugu Kobayashi

Mastermind 9710 points

Part Number: TPS2553

Hi, team.

What is the shunt resistance value of the internal Current Sense circuit?

I want to estimate an accurate voltage drop.

Best Regards,

over 7 years ago

0 Bob Ma over 7 years ago

TI__Expert 8980 points

Hi, Kobayashi,

Please use rDS(on) Static drain-source on-state resistance in datasheet. Vin-Vout=rDS(on)*Iout.

Regards,

Bob

0 Hirotsugu Kobayashi over 7 years ago in reply to Bob Ma

Mastermind 9710 points

Hi, Bob.

Do not use shunt resistors for current sense?
Or is it negligibly small compared to Rds(on) resistance?

Best Regards,

0 Bob Ma over 7 years ago in reply to Hirotsugu Kobayashi

TI__Expert 8980 points

Hi, Kobayashi,

Shunt resistor is included in Rds(on) resistance. As you said, you want to estimate an accurate voltage drop. Just use Rds(on)*Iout is all drop from Vin to Vout.

Regards,
Bob

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TPS2553: Internal shunt resistance