Rainproof Outdoor Power Supply 12V 400W




  • Universal AC input range selectable by a switch
  • Protections: short circuit and overload
  • Cooling by free air convection

    12V switching power supply 400W Indoor Outdoor LED Driver Rainproof Weatherproof 33A

    Power LED lights indoors and out with Myde lighting rainproof switching power supply 12V 400W. This single-rail direct wire power supply has three sets of output terminals for directly wiring multiple lights. The thick aluminum rainproof housing provides basic protection from the elements when mounted in a vertical position. A built-in cooling fan provides plenty of airflow over the circuit board ensuring long service life. This solid and attractive power supply is built from quality components. The constant voltage 12V DC power output is suitable for powering any 12V DC device. This is not a fully waterproof product and should not be used near pools or in places where it may be sprayed by jets.

    What’s Included
    12V switching power supply
    Product reference number MFY-12V400W

      • With short circuit protection, overload protection, and stable output voltage;
      • Built-in EMI Filter;
      • High efficiency and low temperature;
      • 100% load tested;
      • Protection Rating: IP53;
      • CE, ROHS, and EMC approved.
      • Direct wire screw terminals, single rail output, three sets of output terminals.
      • Weatherproof aluminum shell
      • Input Power: 220/240VAC (can also be configured for 110/120V operation)
      • Output of 33 Amps of power at 12 volts DC
      • Output of ~400 watts
      • Mounting tabs on top with two holes allow easy mounting
      • Automatic cutoff when overloaded with auto-reset
      • Connection Type: Direct wire screw terminal block
      • Power Input Terminals: 3 (Ground, N-Neutral, L-Load/Hot)
      • Power Output Terminals: 6 (+,+,+,-,-,-) [single rail]
      • all types of strip lights
      • led lighting
      • led display
      • landscape lighting
      • CCTV security cameras
      • 16 AWG copper wire is recommended for the AC input
      • The DC wire needs to be appropriately sized for the load
  • LED indicator for power on
  • 100% full load burn-in test
  • Low cost and high reliability


Model ATO-S-100-5
DC Voltage 5V
Rated Current 20A
Current Range 0 ~ 20A
Rated Power 100W
Ripple & Noise (Max.)(Note 2) 100mVp-p
Voltage Adjust Range 4.75 ~ 5.5V
Voltage Tolerance (Note 3) ±2.0%
Line Regulation ±0.5%
Load Regulation ±0.5%
Setup, Rise, Holdup Time 200ms, 80ms, 20ms at full load
Input Voltage Range 85 ~ 132VAC/180V~264VAC (selected by a switch) or 255 ~ 370VDC
Frequency Range 47~63Hz
Efficiency (Typ.) 78%
AC Current (Typ.) 2.4A/115V AC 1.2A/230V AC
Inrush Current (Typ.) Cold start: 30A/115V AC 60A/230V AC
Leakage Current <1mA/240V AC
Protection Overload 105~150% rated output power
Protection type: Shut down output voltage, re-power on to recover.
Environment Working Temperature -10 ~ +60℃
Working Humidity 20~90% RH non-condensing
Storage Temperature -20~+85℃
Storage Humidity 10~95% RH non-condensing
Temperature Coefficient ±0.03%/℃ (0~50℃)
Vibration 10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
Safety & EMC (Note 4) Safety Standards UL1012 Approved
Withstand Voltage I/P-O/P: 1.5KVAC I/P-FG: 1.5KVAC O/P-FG: 0.5KVAC
Isolation Resistance I/P-O/P, I/P-FG, O/P-FG: 100M Ohms/500VDC/25℃/70% RH
EMC Emission Compliance to FCC Part 15 J conduction Class B
Others MTBF ≥322.4K hrs MIN. MIL-HDBK-217F (25℃)
Dimension 199*98*38mm (L*W*H)
Weight 0.63kg
Note 1. All parameters NOT specially mentioned are measured at 230V AC input, rated load and 25°C of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12″ twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
3. Tolerance includes set up tolerance, line regulation and load regulation.
4. The switching power supply is considered a component which will be installed into final equipment. Please make sure that the final equipment still meets EMC directives.

Dimension (Unit: mm)

100W switch mode power supply dimensionSMPS terminal pin number assignment

SMPS Power Supply Applications

  • Power Tools
    Electric Saw, Drilling Machine, Ginder, Sand Blast Machine, Puching Machine, Weeding Machine, Air Compressor, etc.
  • Offices Devices
    Computer, Printer, LCD Monitor, Scanning Machine, etc.
  • Electrics & Household Appliance
    TV, VCRS, Radio, Dust Collector, Fan Lamp or LED Strip, Sewing Machine, Microwave Oven, Fridge/Freezr, Coffemarker, etc.
  • Industrial Equipemnt
    Monitoring Equipment, Shipping, Vehicle, Metalhalide Lamp, Solar System, Wind Power Generation, etc.

Tips: Working principles of switching power supply

In simple words, switching power supply operates by the following working principles:

  1. AC is rectified and smoothed to DC.
  2. Output the DC to primary level of switch transformer by high-frequency signal control switch.
  3. Primary level of the switching transformer detects high-frequency voltage and supply the voltage to load through rectification and smoothing process.
  4. The output system sends feedbacks to the control circuit through certain circuits to regulate current output by controlling occupation ratio of PWM.

AC needs to go through the choking coil when being input. Switching power supply is used to filter noise wave of power grid and prevent power supply from outputting noise waves to the power grid. If the power stays the same, higher frequency of the switch will indicate smaller size of switch transformer and higher requirement for switch tube. To meet requirements for output, secondary level of the switch transformer is composed of several windings or just one winding with several taps. Generally speaking, the switch transformer is often equipped with protective circuit to protect switching power supply from idle load or short circuit, or the power supply may be burned out.


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