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    12V DC 25A 300W Switching Power Supply

    5 out of 5 based on 1 reviews | Write a review
    Low price and high quality switching power supply converts 115/230V AC to 12V DC in a stable state at the rated power of 300W and rated current of 25A. It has built-in protections of short circuit, overload and overvoltage, make it safe to use in lots of electrical equipment or devices.
    SKU: ATO-SMPS-300-12
    Free shipping
    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


    Basics Model ATO-S-300-12
    Dimension 215*115*50mm (L*W*H)
    Weight 1.07kg
    MTBF 234.3K hrs min. MIL-HDBK-217F ( 25°c )
    Output DC Voltage 12V
    Rated Current 25A
    Current Range 0~25A
    Rated Power 300W
    Ripple & Noise (max.)( Note 2) 150mVp-p
    Voltage Adjust Range 10~13.2V
    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 90~132V AC/180~264V AC(selected by switch) or 254~370V DC
    Frequency Range 47~63Hz
    Efficiency(Typ.) 74%
    AC Current 6.5A/115V AC; 4A/230V AC
    Inrush Current (max.) 50A/115VAC 50A/230VAC
    Leakage Current <3.5mA / 240V AC
    Protection Overload 105~150% rated output power
    Protection type: Hiccup mode, recovers automatically after fault condition is removed
    Overvoltage 13.8V~16.2V
    Protection type: Hiccup mode, recovers automatically after fault condition is removed
    Safety 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
    Environment Working Temperature -10 ~ +50°C
    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
    Fan on/ off Control RTH3 ≥65°C FAN ON, ≤55°C FAN OFF, ≥80°C output shutdown
    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.

    Tips: Advantages and disadvantages of switching power supply
    1. Advantages
    Switching power supply is characterized by low energy consumption and high efficiency. In circuits of switching power supply, transistors excited by drive signals operates in alternating status from “on” to “off” or from “off” to “on”. Fast conversion speed and low energy consumption of switching transistors have greatly improved efficiency of power supply.
    Switching power supply is characterized by small size and weight. The switching power supply is equipped with no transformer and cooling fins, so it presents smaller size and weight.
    Switching power supply excels in its regulation range. Input voltage of the switching power supply is adjusted by occupation ratio of drive signals. Changes of input signal voltage can be compensated by frequency modulation or width adjustment. When industrial frequency power grid experiences great changes, the switching power supply can still maintain stable output of voltage.
    2. Disadvantages
    Switching power supply keeps bothered with serious switching noises. In switching power supply, power switches and transistors remain in working status. AC voltage and AC current generated by them exerts pulse noises and resonance noises on other components. If users fail to inhibit, eliminate or shield these noises, the operation of the equipment will be seriously influenced. In addition, switching power supply provides no isolation for transformer of industrial frequency. Therefore, the noise may be passed to power grid of industrial frequency, sending serious noise to connected electronic devices, equipment and household appliances. Switching power supply performs poorly in coping with electromagnetic noise, but modern shield technologies can compensate its disadvantage in this aspect.

    Existing reviews of 12V DC 25A 300W Switching Power Supply
    Nice power supply.
    This SMPS works as what is supposed to do. Nice power supply!
    From: Marcel | Date: 03/07/2018
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