Ault Korea / Power General SM2-25-3DCM Switching Power Supply Modules

The Ault Korea / Power General SM2-25-3DCM is a 25W switching power supply module engineered for industrial and embedded systems requiring universal input compatibility. It accepts both AC (85–265 VAC, 47–440 Hz) and DC (118–370 VDC) sources, eliminating the need for separate input conditioning. The module employs a flyback converter topology with current-mode control operating at a fixed 65 kHz switching frequency, delivering 60% minimum efficiency under full-load conditions at 115 VAC or 230 VAC input.

## Technical Specifications

• **Output Power:** 25W maximum
• **Input Voltage Range:** 85–265 VAC (single phase) or 118–370 VDC
• **Input Line Frequency:** 47–440 Hz
• **Switching Frequency:** 65 kHz (fixed)
• **Efficiency:** 60% minimum at full load (115 VAC or 230 VAC)
• **Hold-Up Time:** 16 ms minimum (115 VAC, nominal load); 32 ms minimum (230 VAC, nominal load)
• **Output Voltage Adjustment:** Primary output ±3%; auxiliary outputs fixed on chassis-mount models
• **Line Regulation:** Typically 0.1% (single outputs, 85–265 VAC at nominal load)
• **Load Regulation:** Typically 0.4% (single outputs)
• **Cross-Regulation:** Typically 0.1% (triple output models, V2 and V3 relative to V1)
• **Output Noise/Ripple/Spike:** 1% peak-to-peak maximum
• **Electrical Isolation (Hi-Pot):** 5300 VDC input-to-output for 1 minute
• **Operating Temperature:** −20°C to +70°C
• **Temperature Coefficient:** ±0.05°C over full operating range
• **Relative Humidity:** 0–95% non-condensing
• **Altitude:** 0–10,000 feet

## Key Features

• Soft-start circuit prevents output overshoot and transformer saturation at power-on
• Continuous short-circuit protection on output
• Over-voltage protection set at 120% of rated primary output voltage
• Power-limit overload protection circuit
• Input line fuse protection
• Convection cooling; no forced-air requirement
• Power de-rating 2% per °C from +50°C to +70°C

## Typical Applications

Industrial control systems, telecom equipment, medical devices, and panel-mount power conversion where wide universal input tolerance and compact form factor are essential.

## Compatibility & Integration

The module integrates into systems requiring 5300 VDC isolation between input and output stages. Dual-output variants allow simultaneous adjustment of both primary and secondary outputs (±3%).