TPS923652: Power management forum

Hee Keun Park

Prodigy 40 points

Part Number: TPS923652

Tool/software:

Dear Sir

I have a problem with a product designed with tps923652 and would like to ask for help.

I've read all the descriptions related to E2E's TPS923652, but I'm having trouble solving it.

1.Issue : The switching noise generated in the currently designed PCB is affecting other logic, so I would like to modify it with Ti's guide in the next step PCB version.

2.Requests: May I have your recommended values for

- R_COMP, C_COMP, C_DAMP

- R_SENS, C_SENS.

3. Our design spec

- Vin: 12~16.8V.

- Vout: 40V.

- The output current is under 100mA excluding the output capacitor charging current,

and there is no need for current limit.

Thanks and Best Regards

Hee-Keun ParkTPS923652_Ti.pptx

over 1 year ago

0 Zhiqian Wu over 1 year ago

TI__Mastermind 31255 points

Hi,

Our expert is out of office and will give you a feedback on Monday.

0 Steven Li over 1 year ago

TI__Mastermind 23150 points

Hi Hee-Keun,

Here is a calculation tool that may help you - [FAQ] Is there a calculation tool for TPS923655 / TPS923654 / TPS923653 / TPS923652? - Power management forum - Power management - TI E2E support forums.

I took a look at your schematic. Are you using a 220uH inductor?

Hee Keun Park said:
1.Issue : The switching noise generated in the currently designed PCB is affecting other logic, so I would like to modify it with Ti's guide in the next step PCB version.

Could you provide more detailed description about "affecting other logic"? Do you mean the radiation emission is too high? Or do you mean the input filtering of the LED driver circuit is not designed well and the conduction noise from the power line of the LED driver has impacted other components in your system?

Best Regards,

Steven

0 Hee Keun Park over 1 year ago in reply to Steven Li

Prodigy 40 points

Dear Steven Li

Thanks for your review and interest.

I attached document regarding my concern.

※ I took a look at your schematic. Are you using a 220uH inductor? => It is 22uH.

Thanks and Best Regards.

Hee-Keun Park2451.TPS923652_Ti_2.pptx

0 Steven Li over 1 year ago in reply to Hee Keun Park

TI__Mastermind 23150 points

Hi Hee-Keun,

I just notice you use a current sense resistor of 0.1ohm, which sets the maximum output current to be 2A. However, in the .pptx document you posted, you mention "The output current is under 100mA". Could you please check it? What is your required output current?

Best Regards,

Steven

0 Steven Li over 1 year ago in reply to Steven Li

TI__Mastermind 23150 points

Hi Kee-Keun,

It seems that you posted some replies here and then it disappeared. Could you check it? Is there anything I can help?

I do not want to miss your message :)

Best Regards,
Steven

0 Hee Keun Park over 1 year ago in reply to Steven Li

Prodigy 40 points

Dear Steven Li

I decided to use 200mA output current.
The excel file you sent me was very helpful for setting the tps923652 component value that I initially requested. And I can predict the peak current of the inductor, so I think I can have some confidence in the next step schematic and PCB design.

I appreciate your help, and if possible, I would like to ask for help with the tps923652 LIB for Ti-spice simulation.

If I have any further questions, I will contact you by opening a new case.

0 Steven Li over 1 year ago in reply to Hee Keun Park

TI__Mastermind 23150 points

Hi Kee-Keun,

You are welcome.

Sorry but we do not have SPICE model for TPS923652. We only have SIMPLIS model for TPS923652. Please let me know if you need the SIMPLIS model.

Best Regards,

Steven

0 Hee Keun Park over 1 year ago in reply to Steven Li

Prodigy 40 points

Good Morning Steven

Please provide SIMPLIS model for analysis of application circuit of tps923652.

Thanks and Best Regards

Hee-Keun Park

0 Steven Li over 1 year ago in reply to Hee Keun Park

TI__Mastermind 23150 points

Hi Kee-Keun,

Sure. I will share it with you through e-mail.

I have sent you a friendship request on this E2E forum. After you accept it, I will send you my e-mail address and let's continue the talk through e-mail. Thanks.

Best Regards,

Steven