ucc28950 light load

zhiqun yin

Prodigy 10 points

Other Parts Discussed in Thread: UCC28950

I have a question, when the ucc28950 works at light loads(1%-5% load),how could I get ZVS?

I tested the UCC28950EVM,the output power was 2W,but the input power was16W.

I changed the resistor from DELAB/DELCD pin to GND,but it didn't take effect,

tks!

over 14 years ago

0 Mart over 14 years ago

Prodigy 30 points

ZVS works between 50%..100% load

0 Hong Huang over 14 years ago in reply to Mart

TI__Guru 74115 points

It is usually difficult to achieve ZVS at light load. Alternative technique is used to achieve high efficiency at light load - the technique is called Light-Load Efficiency Management with UCC28950. It can be found how to use this technique in the UCC28950 datasheet and in application notes such as,

http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slua560b&fileType=pdf

There is also an EVM board can be ordered to make evaluation.

Power management

Power management forum

ucc28950 light load