Tool/software:
Hi,
I'm designing a PCB using the above TPS54338. This SMPS takes 14.5V as input, and outputs 3.4V, which is then powering the MCU and a ADP5076 dual boost converter. Since this PCB has sensitive analog signals on it, I wanted to sync up the ADC sampling clock (2MHz) with the TPS54338's and the ADP5076's switching frequency by driving the SYNC pins from the MCU once it has booted (~1s after 3.4V comes online). However, I am getting ambiguous signs whether this is possible at all as the SYNC clock would be provided AFTER the TPS54338/ADP5076 is powered on.
On the ADP5076 I can play around with the EN pins from the MCU, but I cannot disable the TPS54338 from the micro as obviously that would power the MCU down.
Could you please check if I can apply the SYNC clock at any point in a certain configuration? If not, would it be OK to simply toggle the EN pin or VIN must be off before the clock is applied?
Thanks!