TPS62092: charge pump capacitor and phase margin

Toshihiro Watanabe

Part Number: TPS62092

Hello,

The customer heard charge pump capacitor of TPS6209x is to have phase margin adjustment function. I don't think it correct but please let me confirm this.

Do we have a TPS6209x phase margin simulation data?

Best regards,

Toshihiro Watanabe

over 6 years ago

0 Emmanuel Granatello over 6 years ago

TI__Expert 3465 points

Hello Toshihiro-san,

It's my pleasure to support you.

Quoting the datasheet at section 8.3.10:

"The CP and CN pins must attach to an external 10 nF capacitor to complete a charge pump for the gate driver. This capacitor must be rated for the input voltage. It is not recommended to connect any other circuits to the CP or CN pins."

So the phase margin is not affected by the charge pump capacitor.

I don't have simulation data of the phase margin, but I can provide you a measurement. What are the customer's Vout, Vin and load conditions?

0 Toshihiro Watanabe over 6 years ago in reply to Emmanuel Granatello

TI__Genius 10235 points

Hello Emmanuel-san,
Thank you for your answer. I am not clear the point what the customer wanted to know from the phase margin data.
Please let me ask you the measurement if the customer really needed the measurement data.
Best regards,
Toshihiro Watanabe

0 Toshihiro Watanabe over 6 years ago in reply to Toshihiro Watanabe

TI__Genius 10235 points

Hello Emmanuel-san,
The customer requests to measure phase margin of TPS62092. I will share the schematic offline. Would you support the request?
Best regards,
Toshihiro Watanabe

0 Emmanuel Granatello over 6 years ago in reply to Toshihiro Watanabe

TI__Expert 3465 points

Hello Toshihiro-san,

I have answered your question offline.

Could you please give us a feedback to close this post?

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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TPS62092: charge pump capacitor and phase margin