TPS536C7: ICCMAX_A fault during start up

Ben Kuo

Expert 7550 points

Part Number: TPS536C7

Dear expert,

We use TPS536C7+CSD95410/ 12 phase in our application.

During start up, we find "ICCMAX_A" trigger to fault. But controller keep output voltage normally.

I want to check ICCMAX_A definition, but DDh, bit 13 is reserved in TRM.

We have measured startup current and there are no OC happened. May I know why ICCMAX_A trigger to fault?

Here is project file for your reference.

TPS536C7 @ PMBus Address 100d Project_U54_Core_Vdd_AVS_20230303.xml

Regards,

Ben

over 2 years ago

0 Ryan Chen over 2 years ago

TI__Genius 14877 points

Hi Ben,
What was your measured output current?
Can you try going to the main gui page, go to tools, smbus_i2c_saa tool, and then click read block, and enter DD?

Best,

Ryan

0 Ben Kuo over 2 years ago in reply to Ryan Chen

TI__Expert 7550 points

Hi Ryan,

It show NACK after we follow your steps. What is the purpose for the comments?

Regards,

Ben

0 Ryan Chen over 2 years ago

TI__Genius 14877 points

Hi Ben,

ICC_max is related to Intel SVID, but the TPS536C7 does not support SVID. Did you load a configuration file from SVID device into this controller?

Or perhaps load a new configuration file from a new part.

Best,

Ryan

0 Ben Kuo over 2 years ago in reply to Ryan Chen

TI__Expert 7550 points

Hi Ryan,

We don't use SVID and generate the configuration file from programming board.

Why ICC_MAX will show the fault?

Regards,

Ben

0 Ryan Chen over 2 years ago in reply to Ben Kuo

TI__Genius 14877 points

Hi Ben,

Can you check if the correct pmbus address is entered in your lower level gui?
Also, can you send a screenshot of the gui when you try to read the DD block?

"main gui page, go to tools, smbus_i2c_saa tool, and then click read block, and enter DD"

Best,

Ryan

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TPS536C7: ICCMAX_A fault during start up