TPS54424: Schematics Review

Desireddy Teja Reddy

Part Number: TPS54424

Hi Team,

We are using the TPS54424RNVR Switcher part in our schematics. We are using the same part in couple of instances, I had attached the schematic Images below, Kindly review the schematics and share your valuable feedback with us.

Thanks and Regards

- Teja

over 1 year ago

0 Zixu Wang over 1 year ago

TI__Expert 8100 points

Hi Desireddy,

My colleague will give you reply later!

Since my colleague is on leave, feedback would be delayed. Thanks for understanding!

BRs

Zixu

0 Miranda Gu over 1 year ago in reply to Zixu Wang

TI__Genius 15047 points

Hi Teja,

My comments are below.

1. In your note, the Tss is 135us. While Tss is the soft-start time set by Css. The Tss should be ~1ms as you used 8.2uF Css.

2. As you selected high switching frequencies (1.2MHz/1.6MHz), you can use smaller inductance like 1uH/0.8uH to save cost and size of the inductors.

3. For 1.2V rail, I couldn't find the FB resistors, please confirm in your side the FB resistance are right.

4. Are you using 1.2V PG to control 1.8V EN? From the datasheet Figure 28, there may be no need for 1.2V PG pull-up (R103&R109). Feel free to share your comments.

0 Desireddy Teja Reddy over 1 year ago in reply to Miranda Gu

Intellectual 490 points

Hi miranda Gu

Thanks for your valuable Feed back,

As per your instructions:

1. we had updated the Tss as 0.99 ms (~1ms)

2. For the inductor selection we followed as same as the reference design

3. Reg the FB resistors please find the attached image below.

4. Reg the 1.2V PG Pull up for the R103 and R109 we followed the same Ref design.

Thanks and Regards

- Teja

0 Miranda Gu over 1 year ago in reply to Desireddy Teja Reddy

TI__Genius 15047 points

Hi Teja,

Thanks for your updates. If you have no more questions, I will close this thread.

0 Desireddy Teja Reddy over 1 year ago in reply to Miranda Gu

Intellectual 490 points

Hi Miranda Gu,

Thanks for your valuable time and feedback. you can close this thread.

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TPS54424: Schematics Review