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    15V DC 20A 300W Switching Power Supply

    5 out of 5 based on 1 reviews | Write a review
    Cheap 15V DC 20A 300W switching power supply can convert universal AC power to DC power, cooling by built-in DC fan, with short circuit, overload and overvoltage protections, ideal SMPS power supply for a wide range of applications like computer, printer, LED light, monitoring camera, etc.
    SKU: ATO-SMPS-300-15
    30-day Returns
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    Delivery date: 6-12 days


    • Univeral AC input/Full range
    • Protections: short circuit, overload and overvoltage
    • Forced air cooling by built-in DC fan
    • PWM control and regulated
    • 100% full load burn-in test
    • Low cost, compact size and high efficiency


    Model ATO-S-300-15
    DC Voltage 15V
    Rated Current 20A
    Current Range 0 ~ 20A
    Rated Power 300W
    Ripple & Noise (Max.)(Note 2) 150mVp-p
    Voltage Adjust Range 13.5 ~ 18V
    Voltage Tolerance (Note 3) ±1.0%
    Line Regulation ±0.5%
    Load Regulation ±0.5%
    Setup, Rise, Holdup Time 200ms, 50ms, 20ms at full load
    Input Voltage Range 90 ~ 132VAC/180V~264VAC (selected by a switch) or 254 ~ 370VDC
    Frequency Range 47~63Hz
    Efficiency (Typ.) 78%
    AC Current (Typ.) 6.5A/115V AC 4A/230V AC
    Inrush Current (Typ.) Cold start: 50A/230V AC
    Leakage Current <3.5mA/240V AC
    Protection Overload 105~135% rated output power
    Protection type: Constant current limiting, recovers automatically after fault condition is removed.
    Overvoltage 18~21V
    Protection type: Hiccup mode, recovers automatically after fault condition is removed.
     Over temperature RTH3 ≥65°C FAN ON, ≤55°C FAN OFF, ≥80°C output shut down.
    Environment Working Temperature -10 ~ +50℃
    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 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
    Others MTBF ≥234.3K hrs MIN. MIL-HDBK-217F (25℃)
    Dimension 215*115*50mm (L*W*H)
    Weight 1.1kg
    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.

    Dimensions (Unit: mm)

    300W switched mode power supply dimensionSMPS power supply terminal pin number assignment


    15V DC Switching Power Supply Details

    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: Different working modes of switching power supply and linear power supply

    Power devices of linear power supply operate in linear status. In other words, the power devices never stop once started, so they perform poorly in terms of their working efficiency which proves to be 50-60%. As required by its working mode, linear power supply must be equipped with a step-down transformer to help it complete the transformation from high voltage to low voltage. Then, the voltage would be output as DC voltage through rectification. Its working mode determines its poor performance in size, efficiency and calorific value. However, the linear power supply also has advantages. It generates less noise due to less ripples and satisfactory adjustment rate. The linear power supply is applicable to artificial circuit and various amplifiers.

    Power devices of switching power supply operate in switching status with fast frequency (power devices switch at a frequency of 100-200 KHz and the module power supply operates at a frequency of 300-500 KHz). Their switching status improves performance of switching power supply in power loss and working efficiency. However, it comes up with higher requirements for transformers. The transformers applied to switching power supply must be made of materials with high magnetic conductivity. They are designed to achieve an efficiency of 80-90%. The switching power supply is characterized by higher efficiency and smaller size, but it appears poorer than linear power supply in terms of ripples and adjustment rates of voltage or current.

    Existing reviews of 15V DC 20A 300W Switching Power Supply
    20A switching power supply works great as expected.
    I ordered this 20A switching power supply to replace my 10A unit because I needed higher current for more light strips. As soon as receiving it, I replaced my old one with the new one. It works great as expected. All in all, works fine
    From: Annabelle | Date: 17/12/2018
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