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How to choose a good power supply unit
Stability of system will be affected by power supply unit. Some system is very sensitive, and it needs a power supply unit with a highest power quality to work with.

In industry application of power supply unit, its operating temperature is higher than commercial application. So system manufacturers should be careful on power supply selection. Once you choose a power supply unit only because of its cheap price, then you might need to suffer the risk having an unstable system and need to pay higher maintain cost on you customer side.

There are three key points when you select the power supply:

I. Performance
  Performance is depending on your system requirement on power quality. Usually, we will focus on
  • Voltage accuracy
  • Load regulation
  • Input voltage range
  • Ripple and noise
    		•
     
    - Dynamic load
    (This item can be discard if your system do not take dynamic load on your system application.)    		 - Hold up time

    - Rated load
    - Peak load (This item can be discard if your system do not take power exceed rated power)
    - Operating temperature range
    - Over voltage protection

    - Over current protection ¡A
    - Over temperature protection ¡C
    II. Reliability
      Components de-rating, MTBF and thermal will affect reliability of power supply unit. It can reduce your system maintenance cost if you select a power supply with a highest reliability.¡C

    Thermal curve
    III. Safety certification
      In order to protect power supply unit users from money loses or danger, power supply unit manufacturers must pass the examination in professional lab and provide test reports to make sure power supply unit is qualified. Usually, we will suggest you to double check: Lightning surge, Insulation resistance, EFT, EMI, ESD and leakage current, etc.

     
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