About NUCLEO-F446RE current consumption

[KHosh.1]

Dear Sir

・I want to use NUCLEO-F446RE as a PoC for IoT.

・I plan to use alkaline batteries and connect to CH6 PIN4. (3.3V)

⇒It is necessary to reduce the current consumption.

I investigated with a simple FW.(Use stabilized power source(SPS))

Case:Run Mode(HCLK 180Mhz)

・current consumption

JP5：About 44mA

 SPS：About 80mA

Case:Standby Mode(HCLK 180Mhz)

・current consumption

JP5：About Less than 1mA

 SPS：About 40mA

・It turned out that the current consumption of SPS is large.

・At this time, LD1 was Slow blinking Red.

I guessed that the current consumption of SPS is large because ST-Link is running.

・Is this idea correct?

・Is there any other reason why the current consumption of SPS is large?

・If my opinion is correct, is there a way to turn off the power supply to ST-Link?

Regards