TPS56637: Cff value about TPS56637 at low voltage?

Seokmin Hong

Intellectual 485 points

Part Number: TPS56637

Hi, in the datasheet TPS56637,

there is recommended component values for Cff and R.

But 1.8V, 1.2V, 1.05V table has blank value for Cff and R as below.

At the low voltage, no Cff and R is recommended?

over 3 years ago

0 Andrew Xiong over 3 years ago

TI__Expert 5030 points

Hi Seokmin,

Yes, Cff and Rff isn't needed at low output voltage. The feedforward capacitor here recommended is to provide a zero in loop to increase phase margin at high Vout. At low Vout, it isn't needed.

Regards,

Andrew

Power management

Power management forum

TPS56637: Cff value about TPS56637 at low voltage?