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Iris-DM
Associate III
October 8, 2024
Solved

STMH747XIH Power Supply Design

I am looking for some overview on my custom STM32H747 PCB design - mainly that my schematic for the power supply and VCAP etc. are correct

 

IrisDM_0-1728384692742.png

 

The board is to be powered by SMPS.

All comments welcome!

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mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
October 8, 2024

Hello @Iris-DM ,

This is the part of Schematics for SMPS config (in blue) from STM32H747 DISCO schematics :

SofLit_0-1728402373217.png

So, double check with your schematics.

From RM0399:

SofLit_1-1728402522909.png

From DS12930:

SofLit_2-1728402689043.png

Hope it helps.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
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5 replies

STTwo-32
STTwo-32
ST Technical Moderator
October 8, 2024

Hello @Iris-DM 

Let me recommand you to take a look at the AN4938. Also, you can refer to the design of the STM32H747I-DISCO. They should be helpful.

Best Regards.

STTwo-32 

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Andrew Neil
Andrew Neil
Super User
October 8, 2024

Have you reviewed Application note AN4938, Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development:

https://www.st.com/resource/en/application_note/an4938-getting-started-with-stm32h74xig-and-stm32h75xig-mcu-hardware-development-stmicroelectronics.pdf

 

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
October 8, 2024

Hello @Iris-DM ,

This is the part of Schematics for SMPS config (in blue) from STM32H747 DISCO schematics :

SofLit_0-1728402373217.png

So, double check with your schematics.

From RM0399:

SofLit_1-1728402522909.png

From DS12930:

SofLit_2-1728402689043.png

Hope it helps.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
Richard Li
Richard Li
Senior
October 8, 2024

C47 and C45 should change, normally parallel two decoupling capacitors, one for low frequence, one for high frequence, so should like  C41,C39,  C47 can change to 100 nF, C45 increase to 10 uF if you want.

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