Why do multi-output power supplies need a minimum load?
However, a minimum load is often needed on the main output of multi-output units so that other outputs can be kept within tolerance. Such power supplies usually have only one feedback loop on the main output so a load is needed to maintain regulation on the others and prevent output voltages going low.
What are the input specifications for a power supply?
The only other input specifications provided for most power supplies are fuse ratings and whether both line and neutral are fused. Fuse ratings are for fuses that are not usually user-serviceable; the fuses are over-rated and are there to protect against catastrophic failure of the power supply.
Do you know the performance of a power supply?
Regulatory bodies will assess equipment for approval up to 30MHz for conducted emissions and up to 1GHz for radiated emissions so knowing the performance of the power supply across the same range is very useful. The poorer the performance of the power supply, the less specific the datasheet is likely to be.
How long does a power supply hold up?
Hold-up is determined by the input reservoir capacitor; 16ms is a full cycle in USA, 20ms in Europe. There is little room for confusion here, but look out for what happens if there is an AC supply glitch. Ideally, the power supply should ride through this without requiring a manual reset – and for the longer the better.
What is a power supply datasheet?
Power supply vendors specify different measurement points and may put forward noise figures that are obtained after additional filtering components have been added. In short, the datasheet is often only a crude indication of the noise performance of a power supply.
What temperature should a power supply be rated at?
The ambient temperature in which the power supply operates will affect the available output power. Some need to be de-rated from 40 °C, some from 60 °C. Normally, full power will be available at up to at least 50 °C, often with de-rating to half power at 70 °C.
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How To Choose an LED Power Supply
Power supply specs should include a safe operating temperature range. It is best to operate within this and make sure not to stick your power supply somewhere where heat can build up and go above this maximum operating temperature. It is generally a bad idea to stick a power supply in a tiny enclosure with no ventilation system.
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