STM32F4 Discovery Board external power problem

[MDoğr.1]

Hi,

I am trying to feed my Stm32F4 Discovery with 5v in pins. I have tried to feed it with ESC's BECs , PDB or with voltage regulator and Li-Po battery but I am still facing with problems.

The problem is that when I try to make PWM generation in tim4 in all 4 channels, there is no problem. but if I try to use tim3 4 motors works when it is connected with Pc via microUSB, when I feed stm externally just 2 or 3 of them works.

I can not understand reason of this problem and how can ı fix it. Now I can use tim4 and be aware of this problem but I wonder the reason of problem and is there any other pins have this issue ?

[Laurent Ca...]

Dear @Mehveş Zehra Doğruel​ 

Welcome to the STM32 Community

Could you give more details to the STM32 Community about your setup -the material you use- ?

(HW and SW, CPU(s), tools and versions, board(s), motor(s) and so on)

And more especially did you use STM MC tools (such as MC_suite, MC-Motor Profile, MC-SDK, MC-workbench, and so on)?

Best regards

Laurent Ca...