TPS62092: charge pump capacitor and phase margin

Genius 10235 points

Toshihiro Watanabe

Replies: 4

Views: 259

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

Expert 3465 points

Emmanuel Granatello
- Aug 1, 2018 9:03 AM
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?

Thanks and best regards,

Emmanuel

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

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Genius 10235 points

Toshihiro Watanabe
- Aug 1, 2018 9:26 AM
In reply to Emmanuel Granatello:

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
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Genius 10235 points

Toshihiro Watanabe
- Aug 3, 2018 9:19 AM
In reply to Toshihiro Watanabe:

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
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Expert 3465 points

Emmanuel Granatello
- Aug 20, 2018 9:14 AM
In reply to Toshihiro Watanabe:

Hello Toshihiro-san,

I have answered your question offline.

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

Thanks and best regards,

Emmanuel

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

____________________________________________________

TPSM82480 - Industry’s smallest 5.5Vin, 6A DC-DC MODULE with forced-PWM and VSEL option.
Ideal for FPGA and processor power. Only 3.6x7.9x1.55mm! Order samples now!
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TPS62092: charge pump capacitor and phase margin

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