L6470 Case Temperature Reached Thermal Warning

[Haslimi]

Hi ST expert,

I am experiencing stepper driver L6470 hot temperature issue and need your expert advice on my schematic design.

Symptom:

1. During power-up --> No heat-up.
2. After initialization --> Case temperature start to increase.
3. Motor movement --> No issue.

My schematic as attached.

Input to the board is 48V step down to 36V using DC to DC converter.

Added current sense circuit at the input side of driver.

*Motor supply voltage compensation is disabled by FW.

Thank you so much in advance.

[Peter BENSCH]

Welcome @Haslimi, to the community!

Please replace the 220pF at C54 with 220nF.

Regards
/Peter

[Haslimi]

Hi Peter,

Thank you so much for your prompt response.

Update:

Changed C54 from 220pF to 220nF(0.22uF)(Murata #GRM188R71E224KA88).

Result: No improvement.

Sharing the driver output current to the motor during initialization in attachment.

[Peter BENSCH]

Blue is one channel, red the other one?

How is your initialisation routine implemented?

[Haslimi]

Output 1A = Blue

Output 1B = Red

For initialization, I use CAN command. Pls see attachment.

Thank you.

[Peter BENSCH]

There is a community guideline that you should follow if you want to get a meaningful answer or any answer at all. If we have to ask for every detail individually, it will be difficult to answer.

The L6470 is a motor driver that is controlled via SPI, which has nothing to do with CAN.

[Haslimi]

Yes, the CAN command sent to STM32F4, and uC will communicate to L6470 thru SPI to do homing based on FW setting. Anyway, I will proceed to community guideline for further discussion.

Thank you so much on your help. Have a nice day.