48VDC source voltage for USB-C charger

[OlEr_1999891]

Hi!

We are looking at a customer case where power supply for a USB-C PD 5A charger is 48VDC. Since it is hard (impossible) to find DC/DC-controllers optimized for USB-C with 48VDC we considered using a flyback solution instead. 

Is it possible to use PAG1-solution with 48VDC input?  We would of course not need the rectifier, but more or less keep the rest. Any other main things to consider if we were to base it on the 65W CoolGaN ref design?

/Olof

[Pablo_EG · Accepted solution]

Hello Olof,

Thank you for posting on Infineon Community.

We understand that you are looking for a flyback solution with 48V Vin.

Unfortunately, PAG1P is intended for AC line input applications.
The controller has an Under Voltage Protection, which triggers when the input voltage is lower than 90V.
Therefore the 48V input would always fall short, and the controller would not turn on.

If you are willing to consider separate flyback and Type-C controllers, you could do the following:
-Flyback: Gen3/Gen5 CoolSET. We offer standalone controllers as well as controllers with the primary MOSFET integrated.
-Type-C: CCG3PA. This controller can be used with optocoupler feedback, which CoolSET supports.

We do not have reference designs for this configuration.
However, if you run into difficulties in design, we can always support you technically.

Best regards,
Pablo

[OlEr_1999891]

Thanks Pablo for getting back. We decided to use a regular buck DC/DC-controller with 60V input instead and implement variable voltage and OCP etc using the design provided in the CCG3/4 base-board reference design. Not as nice as with a I2C-controlled buck/boost IC but still a bit simplier design than with flyback.

Cheers

Olof