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Home > Power Supplies > DC Power Supplies > Switching Power Supplies

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12V DC 25A 300W Switching Power Supply

$77.34

Low price 300W switching power supply converts universal AC to 12V DC at rated current of 25A. Quality SMPS power supply has

SKU: CHN-SMPS-300-12

Free Shipping Worldwide

Delivery date: 6-12 days

Overview
Documents

Features

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

Specification

Model		CHN-S-300-12
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 ~ 132VAC/180V~264VAC (selected by a switch) or 254 ~ 370VDC
	Frequency Range	47~63Hz
	Efficiency (Typ.)	74%
	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	13.8~16.2V 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
Safety & EMC	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	21511550mm (LWH)
	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.

Dimension (Unit: mm)

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: Advantages and disadvantages of switching power supply

♦ SMPS advantages

1. 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.

2. SMPS 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.

3. Switching power supply excels in its regulation range. Input voltage of the SMPS 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.

♦ SMPS disadvantages

1. Switching power supply keeps bothered with serious switching noises. In the 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.

2. SMPS 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.

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