SMPS in STM32WB55 microcontroller

[KKIM.6]

I found that the STM32WB55 microcontroller have SMPS but I cannot understand how much external component is required.

Here is basic SMPS circut and could you tell me how much circuit is in the microcontrollers SMPS?

[KKIM.6]

In addition, can I directly apply AC current to the microcontroller's SMPS to get DC current?

[KKIM.6]

I read AN5246 but still I'm not sure whether I can use random AC signal as a power supply to the STM32WB microcontroller.

if it is possible, Should I connect AC+ to the VDDSMPS and AC- to the VFBSMPS?

[Remy ISSALYS · Accepted solution]

Hello,

For external component, please look part 1.1.3 External components of AN5246 and figure 5 of DS11929.

You can't directly apply AC current to the microcontroller's SMPS to get DC current.

VDDSMPS is connected VDD and VFBSMPS is connected to C et l like on figure 5.

Best Regards

[KKIM.6]

Regret to hear this. if the microcontroller has an internal AC-DC converter, I would not need any extra IC components anymore. Sad.