TPS40200: How to calculate Cf in Equation (4) with no Rf2

Gerhard van Rensburg

Intellectual 400 points

Part Number: TPS40200

How does one calculate Cf in Equation (4) on Page 15 of Datasheet, with no Rf2

The examples omit Rf2

I guess assume that part of the equation approaches Rf1 value?

Any help appreciated

over 7 years ago

0 Brani Dubocanin over 7 years ago

TI__Expert 4100 points

Hello,
You are correct.
If Rf2 is not used just omit when calculating values needed.
For detailed explanation please check section 7.3.5 in device datasheet.
regards
Brani

0 Ambreesh Tripathi over 7 years ago

TI__Expert 6860 points

Gerald ,

RF1 and CF forms a low pass filter where as RF2 is added to trim the overcurrent trip point to a higher level. In your design you may not need one . You can just use an RC filter .

---Ambreesh

Power management

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TPS40200: How to calculate Cf in Equation (4) with no Rf2