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UCC256304: relate to PMP21160 TEST REPORT

kyeongmin choi
Intellectual 590 points
Part Number: UCC256304
Other Parts Discussed in Thread: UCC28056,

hello

I am tring to review PMP21160.

Below sentance is from PMP21160 test report.

I don't know  which one is correct output power 336W? 240w?

Could you plz tell us correct answer.

The PMP21160 reference design uses UCC28056 CRM/DCM PFC controller and UCC256304 enhanced LLC controller with integrated driver to provide 24-V/10-A output (continuous, 14-A peak) from universal AC input.

336W Auxless AC/DC Power Supply Reference Design with 80 PLUS Platinum Compatible Performance

 

  • 0
    TI__Mastermind 40090 points
    Hello Kyeongmin,

    Both power levels are correct, but the difference is the time spent at each power level.
    Section 1 .3 of the PMP21160 Test Report (see page 2) indicates that 336 W (24 V at 14 A) can be drawn from the supply for as long as 20 seconds with a 10% duty cycle (20 s out of 200-s repetition interval). Since 20 seconds appears to be "infinite time" with respect to the switching frequency, all of the power processing components are designed to support the voltages and currents associated with 336 W loading. However, long-term temperature rise at this power level is not supported.

    Long term, continuous output power is limited to 240 W. Conversion losses at this power level can be sustained indefinitely without excessive temperature rise.

    Thermally, the components' dissipation capabilities are limited such that 336-W operation can be support only for 20 s before maximum temperature rise is reached. After that, power must be reduced to ~229 W for the next 180 s, to cool off before the next 336-W load interval is applied. The long-term average power delivered should equal 240 W (or less).

    To operate at 336 W continuously (100% duty cycle), the thermal dissipation capabilities of the power stage must be improved, even though the existing components can already handle the voltage and current stresses. This can be accomplished with better heat-sinking, increased surface areas, or forced-air cooling, for example.

    Regards,
    Ulrich