Skip to main content
T
t.p
Associate
July 10, 2026
Solved

EVAL-SCS006V1 No Load power consumption

  • July 10, 2026
  • 2 replies
  • 27 views

EVAL-SCS006V1 (TSUSB4532) is plugged into a 65W power supply with an in-line USB-C meter. 

With no load attached, the meter reads 20.06V, 0.016A, and 0.321W. What on the board that consumes this much power?

In contrast, an EVAL-SCS006V1 (STUSB4500) is plugged into the same configuration, the meeter reads 20.07V, 0.000A, 0.000W.

Please help me figure this out!

 

Best answer by Didier HERROUIN

Dear t.p,

The current you observe on EVAL-SCS006V1 is due to the LEDS consumption (20V through the LEDs with 22kohms in series). Of course, these LEDs will not be present in your final design.
On the STUSB4500 board (the reference you provided is not the correct one), I suppose that no LED is switched on.

Best regards,

 

2 replies

Didier HERROUIN
Didier HERROUINBest answer
ST Technical Moderator
July 16, 2026

Dear t.p,

The current you observe on EVAL-SCS006V1 is due to the LEDS consumption (20V through the LEDs with 22kohms in series). Of course, these LEDs will not be present in your final design.
On the STUSB4500 board (the reference you provided is not the correct one), I suppose that no LED is switched on.

Best regards,

 

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
T
t.pAuthor
Associate
July 16, 2026

Hi Didier, 

Sorry for the typo. The STUSB4500 Eval we purchased is EVAL-SCS001V1.

And thank you for pointing out the LEDs. I remeasured everything, it turned out the issue is somewhere with the cables I used, that are not consistent between two brands, and the orientation of the cable when plugged in the USB-C socket.

Thank you again, and please consider the issue resolved.

 

    Terms & ConditionsAccessibility statement