Name: MEAN WELL SKM50W8 series: Isolated single-output DC-DC converter - SKM50W8-12
Brand: MEAN WELL
SKU: SKM50W8-12
Price: 140.46 USD
Availability: InStock

MEAN WELL SKM50W8 series: Isolated single-output DC-DC converter - SKM50W8-12

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Description

SKM50W8-12 — Isolated single-output DC-DC converter

MEAN WELL SKM50W8-12 is an isolated, regulated single-output DC-DC converter accepting 9–75 V DC. It provides 12 V DC with 4170 mA. It uses an 8:1 input range and a shielded 2 × 1 inch package; no minimum load is required.

Download MEAN WELL SKM50W8 Datasheet (PDF)

Series section: PDF pages 80–87.

Model and output specifications

Output voltage	12 V DC.
Rated output current	4170 mA.
Series power and load limit	50 W rated output.
Minimum load	No minimum load is required.
Voltage accuracy	±2.0% maximum
Line regulation	±0.5%; low-to-high input at rated load.
Load regulation	±0.5%, measured over 0–100% load.
Ripple and noise	150 mVp-p. Measured at 20 MHz bandwidth with a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Switching frequency	200 kHz typical.
Maximum capacitive load	330 µF.

Input, control and protection

Input voltage	9–75 V DC; 8:1 range. Nominal inputs listed are 12, 24, 36, 48 and 72 V; specification test input is 24 V.
Input current	10 mA at no load; 2315 mA at full load.
Typical efficiency	90% at the reference conditions.
Input filter and fuse	Pi filter. The manufacturer recommends an 8 A slow-blow external fuse; select protection for the actual input current and installation.
Input surge withstand	100 V DC for 100 ms maximum.
Undervoltage lockout	Typical values: start-up 8.8 V; shutdown 7.5 V.
Overload protection	110–180%; automatic recovery after removal of the fault.
Short-circuit protection	Continuous protection with automatic recovery.
Output overvoltage protection	Clamped by TVS.
Remote ON/OFF	Referenced to −Vin: >2.5–75 V or open circuit turns the output ON; <1 V or a short circuit turns it OFF.
Output adjustment	Typical ±10% adjustment. Use the single-output external-resistor trim circuit and stay within the rated voltage, current and power limits. Trim to −Vout raises the voltage; Trim to +Vout lowers it.
Trim reference values	Vref 2.5 V; R1 3.83 kΩ; R2 1 kΩ; R3 7.5 kΩ. Use the manufacturer’s formulas and the exact model’s pin assignment.

Operating conditions and isolation

Operating temperature and cooling	−40 to +90°C; free-air convection. Apply the load-derating limits.
Load derating	Full load through 50°C; 75% at 60°C; 50% at 75°C; 25% at 85°C; 20% at 90°C. Use the specified PCB mounting arrangement.
Maximum case temperature	110°C.
Working humidity	5–95% RH, non-condensing.
Storage conditions	−55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient	±0.03%/°C over 0–30°C.
Vibration	10–500 Hz, 2G; 10 minutes per cycle for 60 minutes along each of the X, Y and Z axes.
Reference test conditions	24 V DC input, rated load, 25°C and 70% RH, unless otherwise stated.
Input-to-output withstand voltage	3 kV DC.
Isolation resistance	100 MΩ.
Isolation capacitance	1000 pF typical.
Input-voltage derating	80% load at 9 V input; 100% from 12 to 75 V. Apply both input-voltage and temperature derating.
Required PCB mounting	Mount the module on a 95 × 85 × 1.6 mm PCBA in the final equipment, as specified by the thermal reference. This is an installation requirement, not a statement that a PCB is included.

Mechanical design and installation

Dimensions	50.8 × 25.4 × 13.7 mm (L × W × H).
Case construction	Metal case with shielding on all six sides.
Pin assignment	1 +Vin; 2 −Vin; 3 Remote ON/OFF; 4 Trim; 5 −Vout; 6 +Vout. Check the bottom-view orientation before PCB assembly.
Mechanical drawing details	Pin diameter 1 ±0.1 mm; lead length 5.8 mm. Recommended PCB hole Ø1.2 mm.
Unit weight reference	43 g, explicitly stated as a catalog packing reference per unit.
Soldering	3–5 seconds at 265°C maximum, measured 1.5 mm from the case.

EMC and manufacturer references

Safety and catalog references	EAC TP TC 020/2011 approved.
EMC emission	BS EN/EN 55032 radiated Class A without additional components; Class B with external components. Conducted emission is listed as N/A in the specification.
EMC immunity	4 kV contact, Level 2 under BS EN/EN 61000-4-2; -4-3: 3 V/m, Level 2; -4-4: 0.5 kV, Level 1; -4-5: 0.5 kV line-to-line, Level 2; -4-6: 3 V emf, Level 2; -4-8: 1 A/m, Level 1.
MTBF reference	>462 khrs to MIL-HDBK-217F at 25°C; a reliability reference, not a service-life guarantee.
Manufacturer warranty reference	The catalog states a 3-year manufacturer warranty.
Class B EMC reference circuit	F1: 8 A slow-blow fuse; C1: 47 µF/100 V; C2: 2.2 µF/50 V, MLCC 1210; C3/C4: 1000 pF/5 kV MLCC; L1: 325 µH common-mode choke. This is a catalog circuit example: its C2 voltage rating does not cover the entire 9–75 V input range. Obtain a manufacturer-confirmed filter with ratings suitable for the actual input; do not apply the 50 V example component unconditionally at higher input voltages.