TPS563210A: Bootstrap and Soft start capacitor

Takashi Yamaguchi

Part Number: TPS563210A

Hi team,

My customer is selecting external parts for the TPS563210A. I received a question about the voltage rating for bootstrap and Soft start capacitor.

1. For the bootstrap capacitor, it seems that the TPS563210A has internal 5V regulator and it is connected to VBST pin. Therefore, should customer choose a ceramic capacitor rated at 5Vx2=10V or higher, with a margin of about twice as much?

2. For the soft start cap, I though that the SS pin voltage will be same as VF, but Fig.28 to Fig.31 in d/s show that SS pin voltage is 5V. Is it true?

Regards,

Yamaguchi

over 5 years ago

0 Vincent Zhang(BSR) over 5 years ago

TI__Expert 4795 points

Hi, Yamaguchi,

1. please choose a 25V/50V rating ceramic cap for more robust design

2. At soft start process reference voltage will follow with SS but when reference voltage, but when it reaches VF, SS voltage will continue to rise, so it's different with VF.

0 Takashi Yamaguchi over 5 years ago in reply to Vincent Zhang(BSR)

TI__Genius 13400 points

Hi Vincent,

Thank you for the answer. I informed it to the customer and got the feedback.

For the #1, what is the effective capacitance required for Cboost? 0.1uF?

For the #2, SS cap is also required 25V/50V rating ceramic cap?

Regards,

Yamaguchi

0 Vincent Zhang(BSR) over 5 years ago in reply to Takashi Yamaguchi

TI__Expert 4795 points

Hi Yamaguchi,

1#, yes 0.1uF effective capacitance is preferred.

2#，25V rating, X7R is preferred, depends on how customer required the soft start time accuracy

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TPS563210A: Bootstrap and Soft start capacitor