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    12V DC 4.2A 50W Switching Power Supply

    Cheap yet quality 12V DC switching power supply with universal AC input, works at 4.2A rated current and 50W rated power with short circuit and overload protection, best SMPS power supply for office devices, household appliance and industrial equipment.
    SKU: ATO-SMPS-50-12
    Free Shipping Worldwide
    Delivery date: 6-12 days


    • Universal AC input / Full range AC input
    • Short circuit, overload and overvoltage protections
    • Cooling by free air convection
    • LED indicator for power on
    • 100% full load burn-in test
    • High reliability, low price and wide range of applications


    Model ATO-S-50-12
    DC Voltage 12V
    Rated Current 4.2A
    Current Range 0 ~ 10A
    Rated Power 50.4W
    Ripple & Noise (Max.)(Note 2) 100mVp-p
    Voltage Adjust Range 10.8 ~ 13.2V
    Voltage Tolerance (Note 3) ±1.0%
    Line Regulation ±0.5%
    Load Regulation ±0.5%
    Setup, Rise, Holdup Time 200ms, 100ms, 30ms
    Input Voltage Range 85 ~ 132VAC/170V~260VAC (selected by a switch) or 240 ~ 370V DC
    Frequency Range 47~63Hz
    Efficiency (Typ.) 78%
    AC Current (Typ.) 1.3A/115V AC     0.65A/230V AC
    Inrush Current (Typ.) Cold start: 18A/115V AC     36A/230V AC
    Leakage Current <1mA/240V AC
    Protection Overload 105~150% rated output power
    Protection type: Hiccup mode, recovers automatically after fault condition is removed.
    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 Part15 Jconduction Class B
    Others MTBF ≥408.3K hrs MIN. MIL-HDBK-217F (25℃)
    Dimension 159*97*38mm (L*W*H)
    Weight 0.51kg
    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)

    50W Switch-mode Power Supply DimensionSMPS Terminal Pin Number Definitions

    Block Diagram

    50W Switching Power Supply Block Diagram


    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: Types of switching power supply (SMPS)

    Switching power supply is divided into DC and AC types. The DC type operates on basis of DC/DC convertors. In other words, categorization of DC switching power supply depends on that of DC/DC convertors.

    DC/DC convertors are categorized into two types by the standard of whether there is electric isolation between input and output voltage. Those with electric isolation are categorized as isolated DC/DC convertors and those without electric isolation are categorized as non-isolated DC/DC convertors.

    AC/DC conversion means converting alternating current into direct current. Its power flow proves to be bidirectional. Power flow borne by power supply flow is called rectification and that borne by returning power supply flow is called active inversion. It can be categorized into half-wave circuit and full-wave circuit according to the wring mode, classified into single phase circuit, three-phase circuit or multi-phase circuit according to the number of phases, or divided into one quadrant circuit, two quadrant circuit, three quadrant circuit and four quadrant circuit according to the operational quadrant.

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