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Power Saving Problem on UCC28061+UCC25600

Other Parts Discussed in Thread: UCC28061EVM, UCC25600EVM

Hi,

The customer is now surveying a 250W adapter power and it can meet Energy Start 2.0

Application: Adapter power for medical/industry

I/P:90Vac~264Vac; O/P:12V

SPEC: Follow Energy Start 2.0 (Especilly for that the input power has to be less than 0.5W when no output current at 110Vac/230Vac)

After tested the UCC28061EVM+UCC25600EVM, the measuring data of input power is as below:

Conditions: 12V/0A

110Vac: 2.32W

230Vac:1.65W

 

And also test the UCC28061EVM only, the data is

110Vac:0.65W

230Vac:0.32W

With above tests, the input power is over 0.5W and it seems that the most loss is contributed from UCC25600EVM.

How does it meet power saving requirement for energy start 2.0? Customer said that the power loss of NCP1605+L6599 is just 0.42W at 110Vac/230Vac with 0A output current. 

Could you kindly share the expereince to reduce the static power loss and Pi<0.5W!

 

Brian, Regards.