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F28M36P63C2: Sample time for Concert F28M36x Simulink

Part Number: F28M36P63C2

Hello,

I am using the CARD Concert F28M36x control in simulink, but I have problems with the sample time, I do not understand how it works.

I am developing a control for buck converter.

When I select a sample time of 1 / (100kHz) the control works, but when I increase the sample time to 1 / (1MHz) the microcontroller does not work.

my questions are:

Does the sampe time depend on the ADC?
F28M36x has an ADC of 2.88 MSPS, should I be able to select 1 / (2.88 MHz) as the maximum sampling time?

Thank you