SCAP pin of TPS54A20

Takahiro Nishizawa

Genius 5575 points

Other Parts Discussed in Thread: TPS54A20

I have a queation about TPS54A20.

Please tell me the role of SCAP pin and SCAP capacitor.

Why does this IC have SCAP pin and SCAP capacitor?

Best regards,

Takahiro NIshizawa

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

The series capacitor is fundamental to the Series Capacitor Buck converter topology. You can get a brief discussion in the TPS54A20 datasheet section 8.1:

For a more detailed explanation, see this app note:

www.ti.com/.../slva750

0 Vental Mao over 8 years ago

TI__Expert 5745 points

I think the blog can also give you more detail information.

e2e.ti.com/.../step-by-step-how-the-series-capacitor-buck-converter-works

0 Pradeep Shenoy over 8 years ago

TI__Intellectual 790 points

The role of the series capacitor is to help with voltage step down. The series capacitor is used in the energy transfer process from input to output of the converter. The series capacitor provides a 2:1 voltage step down and reduces the switch node voltage to half the input voltage.

0 JohnTucker over 8 years ago in reply to Pradeep Shenoy

TI__Guru**** 191445 points

Looks like there is plenty of info available. let us know if you need further assistance.

Power management

Power management forum

SCAP pin of TPS54A20