Other Parts Discussed in Thread: , PMP10885
Hello,
I'm currently designing a 4.2amp 5v usb charging circuit for a customer. I used web bench for the initial design. It gave me a circuit very similar to the UCC28740evm-525, with the exception of some input and output filter values. Current I have not been able to get my circuit to hold any current on the output. I believe the root. I was hoping to get some advice on the proper tranformer configuration (turns, core, ratios, etc.) to hopefully get my circuit up and running.
Originally I tried a custom transformer with no success. This transformer also did not hold more than 100mA. Then tried an off the shelf transformer that was designed specifically for the UCC28740 (WE part number: 750313823). This transformer also did not hold more than 100mA. I have attached the datasheet for the WE part number: 750313823.
I have attached my schematic . please let me know if anything looks incorrect or concerning.
Thanks in advance for your help.
Kevin pcb619 schematic.pdf