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About TPS54328's input or output capacitor

Pokkun
Genius 4695 points
Other Parts Discussed in Thread: TPS54328

Hello.

My customer is currently in using TPS54328,now.

I have gotten a question about this product .

So, please teach me about TPS54328.

＜Question＞

We know that recommended capacitor of this device is a ceramic capacitor .

But, we want to configure only the electrolytic capacitor of 100uF the input or output capacitor .

①Can I use the electric field only capacitor of 100uF in input or output capacitor ?

②( If the answer is "No")

How is there adverse effect?

Could you help us?

Best Regards,

Pokkun

  • 0
    TI__Expert 4875 points

    Hi Pokkun,

    For D-CAP2 mode converter, it is recommended to use ceramic capacitor with low ESR. Electrolytic cap has higher value and high ESR. If you use electrolytic cap, the side effect could be on the control loop. For D-CAP1 mode, the high ESR capacitor will contribute to higher output ripple, which can be used for ramp compensation for the control loop. Different from D-CAP1, D-CAP2 mode control combines constant on-time control with an internal compensation circuit for pseudo-fixed frequency and low external component count configuration with both low ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output. An internal ramp is added to reference voltage to simulate output ripple, eliminating the need for ESR induced output ripple from D-CAP1 mode control. In this case, if you use electrolytic cap with high ESR, the effect of the ramp compensation will be duplicated, which could cause stability problem for the control loop.

    Best regards,

    Anthony