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    12V DC 4.2A 50W Switching Power Supply

    12V switching power supply converts AC to DC, working at rated current of 4.2A and rated power of 50W. It has short circuit and overload protection, making it high reliabiity in the household appliance and industrial equipment.
    SKU: ATO-SMPS-50-12
    Free shipping
    Delivery date: 6-12 days


    • Universal AC input/Full range
    • Short circuit, overload and overvoltage protection
    • Cooling by free air convection
    • 100% full load burn-in test
    • High reliability and wide range of applications


    Basics Model ATO-S-50-12
    Dimension 159*97*38mm (L*W*H)
    Weight 0.51kg
    Output DC Voltage 12V
    Rated Current 4.2A
    Current Range 0~4.2A
    Rated Power 50W
    Ripple & Noise (max.)( Note 2) 120mVp-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 300ms, 50ms, 80ms /230VAC 800ms, 50ms, 12ms/115VAC at full load
    Input Voltage Range 85 ~ 264V AC or 120 ~ 370V DC
    Frequency Range 47~63Hz
    Efficiency (Typ.) 76%
    AC Current (Typ.) 2A/115V AC 1A/230V AC
    Inrush Current (Typ.) Cold start, 20A/115V AC; 40A/230V AC
    Leakage Current <3.5mA / 240V AC
    Protection Overload 105~150% rated output power
    Protection type: Hiccup mode, recovering automatically after fault condition is removed.
    Safety & EMC Safety Standards Approved by Ul1012, UL60950-1, TUV EN60950-1, CCC GB4943
    Withstand Voltage I/P-O/P: 1.5KV AC I/P-FG: 1.5KV AC O/P-FG: 0.5KV AC
    Isolation Resistance I/P-O/P, I/P-FG, O/P-FG: 100M Ohms/500V DC/ 25°C / 70% RH
    EMC Emission Compliance to EN55022 (CISPR22) Class B, EN61000-3-2, -3
    EMC Immunity Compliance to EN61000-4-2, 3, 4, 5, 6, 8, 11, EN55024, light industry level, criteria A
    Environment Working Temperature -10 ~ +60°C (Refer to output load derating curve)
    Working Humidity 20~90% RH (non-condensing)
    Storage Temperature -20~+85°C
    Humidity 10~95% RH (non-condensing)
    Temperature Coefficient ±0.03%/°C (0~50°C)
    Vibration 10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
    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.

    50W switching power supply dimensions

    Block Diagram
    switching power supply circuit diagram

    Derating Curve & Static Characteristics
    SDPS derating curve & static characteristics

    Tips: Types of switching power supply
    Switching power supply is produced in 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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