Other Parts Discussed in Thread: UCC28742
Hi Everyone:
Parameter: AC-DC,Pout:30W;Vin:90V~300VAC; internal MOS cotroller，Isolated or non-isolated。Which PN can meet the require? Thank you。
Hello Tony,
I don't believe that TI offers a low power off line converter with an internal MOSFET to achieve 30W. The UCC28740 and UCC28742 controllers can achieve 30W quite easily with an external MOSFET.
The following link will get you to a reference design for 45W using the UCC28740 controller.
The UCC28740 has an internal high voltage startup circuit that turns off once the UCC28740 is up and running. However, if you wish to reduce the cost of the design. You can use the UCC28742 that does not have the internal startup circuitry and requires a trickle charge resistors to startup the system. The following link will get you to the data sheet.
http://www.ti.com/lit/ds/symlink/ucc28742.pdf
Regards,
Hello,
There are many tools at your disposal to modify the design to 72W.
Regards,
Mike