TLV62585：C3 capacitance

Eva Lai

Prodigy 50 points

Part Number: TLV62585

Hi all,

我們使用 We use TLV62585 for 3.3V 轉 convert to 1.8V應用 application.

SPEC建議值 recommend value of C3是 is 22PF，想請問是否可以使用 I'd like to ask if it can be 18PF?

謝謝 Thank you

7 months ago

0 Moheddin Pasha Shaik 7 months ago

TI__Genius 15820 points

Hello Eva,

Thank you for using E2E,

Eva Lai said:
SPEC建議值 recommend value of C3是 is 22PF，想請問是否可以使用 I'd like to ask if it can be 18PF?

To improve the load transient response, a 22pF is good for 1.8V output application, but you can also use 18pF. It should not be a problem.

Thank you & regards,

Moheddin.

0 Eva Lai 7 months ago in reply to Moheddin Pasha Shaik

Prodigy 50 points

Hi Moheddin,

If we utilize the TLV62585 for a 5V to 0.9V conversion application with a load ranging from 0.9A to 1.2A, I would like to inquire whether C3 can be set to 18pF. Alternatively, is there a recommended value for C3?

Thank you

0 Moheddin Pasha Shaik 7 months ago in reply to Eva Lai

TI__Genius 15820 points

Hello Eva,

The feedforward (Cff) will affect the step load performance. A higher Cff will result to lower overshoot/undershoot, but extended the recovery time. And to calculate for the Cff, please refer to the formula below.

t = Cff * (R_FB_down)

t: 2200ns

Cff: feedforward capacitor

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TLV62585：C3 capacitance