Delta Elektronika SM120-25D

The Delta Elektronika SM120-25D is a programmable DC power supply delivering up to 3000 W across a 0–120 V, 0–25 A output range. Purpose-built for research, development, and automated test environments, it combines tight voltage and current regulation with fast transient response and multi-interface control. The unit operates from three-phase AC input (380/400/415 V nominal, 48–62 Hz) and achieves 90% efficiency at full load.

## Technical Specifications

**Output Performance**
• Voltage range: 0–120 V DC
• Current range: 0–25 A DC
• Maximum power: 3000 W
• CV regulation (line): 5 mV
• CV regulation (load): 5 mV
• CC regulation (line): 50 mA
• CC regulation (load): 50 mA
• Ripple and noise (CV): 5 mV RMS, 50 mV peak-to-peak
• Ripple and noise (CC): 15 mA RMS, 60 mA peak-to-peak
• Temperature coefficient: 10 µV/°C
• Stability (post warm-up): 3.5 × 10⁻⁵
• Transient recovery (50%–100% load, 2.7 A/µs): 100 µs to 50 mV deviation
• Rise time (0–15 V): 0.36 ms; (15–0 V): 0.26 ms
• Fall time (15–0 V): 0.36 ms

**Input Specifications**
• AC supply: 380 V, 400 V, or 415 V nominal (three-phase, line-to-line)
• Frequency: 48–62 Hz
• Input current: 5.7 A RMS at 400 V AC
• Power factor: 0.88 (380 V, full load)
• Efficiency: 90% (full load)

## Key Features

• Analog programming (0–5 V) for voltage and current control
• Optional isolated analog programming via ISO AMP CARD
• Digital interfaces: Ethernet, RS232, IEEE 488 (via optional internal cards)
• 10-turn potentiometer control with 0.03% resolution
• Master/slave operation for series and parallel configurations
• Remote sensing for load-end voltage regulation
• Short circuit, overload, reverse voltage, and overvoltage protection
• Temperature-controlled cooling fan
• Operating range: –20 to +50 °C
• Humidity: 95% non-condensing to 40 °C; 75% non-condensing to 50 °C
• Altitude rating: Up to 2000 m
• EMC Class B (generic emission)

## Typical Applications

R&D benching, battery charging/testing, semiconductor parametric test, power conversion validation, device burn-in and aging studies.

## Compatibility & Integration

Supports analog 0–5 V control, isolated programming via optional ISO AMP CARD, and digital control through Ethernet, RS232, or IEEE 488 interfaces. Parallel and series stacking available for scaled current and voltage output.