We wish to do a 50W offline SMPS and are thinking of using UCC28051.
-But , in EU, does a 50W SMPS need power factor correction?
I looked up IEC61000-3-2 on google but it doesnt appear to say.
75W and up .
- Citation below from the book of TI Power Supply Design Seminars SEM1900, 2010-11, topic 4, page 4-1.
At the present, "PFC is required for most designs with input power greater than 75W to meet EN/JIS-61000-3-2, and greater than 100W to meet Energy Star".
In EU, you must comply EN61000-3-2 for SMPS over 75W for household use.
The easiest way to comply, is to integrate an active PFC in your design. It's not a demand that you use a active PFC, but you need to have a PF over a certant percentage (Energy Star) and the harmonics must be lower than the ones stated in EN61000-3-2.
Therefore it's recommended to use an active PFC with a front end filter.
yes but if you are designing a 330W peak power audio class D amplifier, and you also need to design an SMPS to supply it.............how do you proove that the average power consumption of that class D amplifier is below 75W?
Requirements for PFC and THD are related to input power. So, simple power test can proof your theory. By the way, Agency always take "the worst case" and like final touch : 6db "safety margin".
Normally your average power is 1/6th to 1/8th of your peak power (330W).
1/6th is 55W and 1/8th is 41.25W.
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