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USB-PD-CHG-EVM-01: Screeching noise

Part Number: USB-PD-CHG-EVM-01

Tool/software:

I am not sure why I hear a noise when I use this board to power downstream devices. I tried everything 

-i thought its a grounding issue so removed all wires and now just power one board using barrel jack pig tails

-i have also removed the battery to eliminate any source of issue and just use USB C source (max 45W) and SYS output to ppwer my downstream. Everytime i power on i hear the screeching sound. 

- when i power my load using its own power adapter that never happens. 

Can someone please help. I do not know if I should proceed  with testing

  • Hi Aria,

    Can you attach your schematic or is this on the EVM?  What is your input voltage, battery voltage, charge current and load current?  Can you send a scope shot of the BQ2579x charger's VBUS, VSYS, SW1 and SW2 when this occurs, zoomed in to see at least 5 switching pulses?

    Regards,

    Jeff