1. Description :

The purpose of the document is to specify the functional requirements of a 42W switching power supply.

2. Input characteristics :

2.1 Input Voltage:

      Rated Voltage:100~240Vac

      Variation Range:90-280Vac

2.2 Input Frequency:

      Rated Frequency: 50/60Hz.

      Variation Frequency:47-63Hz

2.3 Input Current:

     1.2Amps max At any input voltage and rated, DC output rated load.

2.4 Inrush Current:

      120 Amps Max. Cold start at 240Vac input, with rated load and 25℃ ambient.

2.5 Ac Leakage Current:

      0.25mA Max.At240Vac input.

3. Output characteristics

3.1 Power output

3.2 Combined Load/Line Regulation

3.3 Ripple and Noise:

     Under nominal voltage and nominal load,the ripple and noise are as follows when measure with Max.Bandwidth of 20MHz and        Parallel 47uF/0.1uF,crossed connected at testing point.

     Voltage                Ripple and Noise(Max.)

     +12Vdc                 120mV p-p

3.4 Turn on delay time:

      3Second Max.at 115Vac input and output Max.load.

3.5 Rise time:

      40 mS Max.at 115Vac input and output Max load.

3.6 Hold up time:

      5 mS Min.at 115Vac input and output Max.Load.

3.7 Efficiency:

      75% Min, At 115/230Vac input voltage,1/4,1/2,3/4 and full load calculation average efficiency.

4. Protection function :

4.1 Short circuit test:

      The power supply will be auto recovered when short circuit faults remove.

4.2 Over current Protection:

      The power supply will be auto recovered when over current faults remove.

4.3 Over Voltage Protection:

      The power supply will auto recovered when faults remove 120%~170%.

5. Environmental requiremet

5.1 Operating Temperature:

      0℃ to 40℃,Full load, Normal operation.

5.2Storage Temperature:-20℃ to 80℃

     With package

5.3 Relative Humidity:

     5%(0℃)~90%(40℃)RH,72Hrs,Full load, Normal operating.

5.4 Vibration:

     1. Operating: IEC 721-3-3 3M3

         5~9Hz,A=1.5mm

         (9~200Hz,Acceleration 5m/S2)

     2. Transportation:

          IEC 721-3-2 2M2

          5-9Hz,A=3.5mm

          9~200Hz, Acceleration=5m/S2

          200~500Hz, Acceleration=15m/S2

     3. Axes,10 cycles per axis.

         No permanent damage may occur during testing.

         The SAMPLE has to restore to its original situation after power off/on..

5.5 Dropping Packed:

      1M for wallmount type and 760mm for desktop type as above described.

      The horizontal surface consists of hardwood at least 13mm thick, mounted on two layers of plywood

      each 19mm to 20mm thick,all supported on a concrete or equivalent non-resilient floor.

6. Safety requirement

6.1 Safety: accord with TUV/GS-(EN60950-1),CCC-(GB4943) AS/NZS: 60950-1, UL/CUL-(UL60950-1)

6.2 DIELECTRIC STRENGTH Hi-Pot:

      Primary to secondary:1800Vac10mA/3S for type test.

6.3  Iusulation resistance:

       Primary to secondary:10MΩ min at 500V DC.

6.4  EMI STANDARD

       Meets the Limits of

       <1>.Fcc part15 class B rules

       <2>.EN55022 class B rules

       <3>.GB9254-1998,GB17625.1-2003

7. Mechanical requirement

7.1 Enclosure:

      The power supply size: L105 x W47 x H32mm;

7.2 Input Connector:

      IEC-320-C14.

All our products comply with European environmental standard as well as RoHS ,UL, CE,FCC,KC,PSE,SAA ,At the same time, Wawies consumer electronic devices have got a wide range of safety approvals to meet specific international standards & requirements. We have dedicated teams of R&D, engineers and quality control experts focusing on product development. 

Our strict quality assurance program ensures all our products to meet IEC Standards.. In addition, the strong production capacities allow fast lead-time and guarantee fresh & premium products at competitive prices. Headquartered in Shenzhen, we are committed to providing immediate product support and excellent customer services.

1.  Can you put my brand name (logo) on these products?

     Yes,.We can support OEM/ODM service, the process of customization is following:

      1) provide your specific requirement.  

      2) our design engineer draw the design draft.

      3) you confirm the design draft.           

      4) we start produce it.

2.  What payment method do you accept?

      T/T,Western Union,PayPal.

3. What is the Minimum Order Quantity(MOQ)?

    We can sell one piece sample for your test.

4. What is the lead time of your products?

    1-3 days for one sample, 15 working days for a large quantity.

5.  About the freight

   The freight is different due to different destination. In general, the delivery should be reached in America or Europe in a week by FEDEX. An order with large amount may need 25-30 days. Please contact our sales to get to know the details.

We also have other computer cases , barebone mini PC , mainbord , If you need more information,please send us Email or visit our website :

http://realan.en.china.cn/       OR      /  

for more details.