12V 4A 50W SMPS Switching Power Supply

SKU: PH-SMPS-50-12

$54.15

● Provides steady 50W 12V power to ensure consistent, dependable device operation. ● Passive free-air convection keeps the unit cool without noisy fans. ● 100% full-load burn-in tested for enhanced long-term reliability. ● Ideal for LED strips, computers, printers, security camera systems, and factory automation controllers.

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Overview
Specs
Application
FAQ
Reviews

Overview

50W 12V switching DC power supply delivers reliable performance at an affordable price, featuring universal AC input compatibility and a stable 4.2A rated output. Built with short-circuit and overload protection for enhanced safety and durability, it is the ideal economical choice for powering office electronics, household appliances, and industrial equipment alike.

Feature

Global Compatibility: Full-range 110V/220V AC input enables seamless operation across regions, no voltage adjustment needed.
Multi-layer Safety: Built-in short-circuit, overload, and overvoltage protection to shield both the unit and your equipment.
Budget-friendly Performance: High-quality build at an accessible price, ideal for cost-conscious office, home, and industrial use.

Details

Input 220V: Accepts 220V AC input to power the unit.
Ground Wire: Provides safety grounding to prevent electric shock.
Output Negative Terminal: Connects to the negative side of your load.
Output Positive Terminal: Connects to the positive side of your load.
Indicator Light: Displays the power supply’s working status at a glance.
Voltage Regulation: Allows for adjustment of the output voltage level.

Dimension (Unit: mm)

50W Switching DC Power Supply Dimension

Switching DC Power Supply Terminal Pin Number Difinitions

Block Diagram

Switching DC Power Supply Block Diagram

Specs

Model		PH-S-50-12
Output	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	1599738mm (LWH)
	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.

Application

Household Appliances

Factory Equipment

Monitoring Equipment

Power Tools

FAQ

Q1: What are the types of switching power supply (SMPS)?

Switching power supplies (SMPS) are mainly classified into DC and AC types. DC SMPS are based on DC/DC converters, which are split into isolated and non-isolated types depending on whether input and output are electrically isolated. AC/DC converters transform AC to DC with bidirectional power flow—forward for rectification and reverse for active inversion. They can be categorized by circuit structure (half-wave or full-wave), phase number (single-phase, three-phase, or multi-phase), and operating quadrant (one to four quadrants).

Q2: What is the difference between DC and AC SMPS?

DC switching power supplies operate with DC input and rely on DC/DC conversion technology, while AC switching power supplies take AC input and perform AC/DC conversion. DC SMPS are mainly categorized by whether their DC/DC converters are isolated or non-isolated, whereas AC/DC converters feature bidirectional power flow and can be classified by circuit structure, phase number, and operating quadrant.

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From: Benno | Date: 8/14/2026 1:48 AM

Solid & Silent 12V 50W Power Supply for DIY Projects!

Picked up this 12V 50W switching power supply for my LED workbench lighting and 3D printer project. The passive convection cooling is completely silent—no noisy fan to deal with. Output voltage tuned easily to a rock-solid 12.0V using the trim pot. Built-in overload protection gives great peace of mind. Excellent value for any workshop setup!

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