The TDK-Lambda LFS-42-28 is a 28 VDC regulated power supply engineered for industrial and commercial applications demanding precise voltage stability and high reliability. This convection-cooled unit accepts user-selectable dual-range AC input (85–132 VAC or 170–265 VAC, 47–440 Hz) for global deployment and delivers 186 W maximum input power with exceptional line and load regulation of 0.01% across the full operating envelope.
Technical Specifications
Output: 28 VDC with 20 mV RMS / 150 mV pk-pk ripple and noise. Line regulation and load regulation both measure 0.01% (low to high line; 0 to full load). Temperature coefficient: 0.03%/°C.
Input: 85–132 VAC or 170–265 VAC, user-selectable; 47–440 Hz; maximum 3.7 A RMS input current. In-rush current limiting included on all units.
Hold-up Time: 16.7 ms at full load, maximum output voltage, and 105 VAC input (60 Hz); 100 ms at maximum output power and 210 VAC input (50 Hz) on 220 V configuration.
Thermal: Operating 0°C to 60°C continuous duty with derating above 40°C. Guaranteed turn-on at −10°C. Minimum efficiency 55% per series characteristics.
Isolation: 1500 VAC input-to-output; 1500 VAC input-to-ground; 500 VAC output-to-ground.
– Key Features
• Non-crowbar, inverter shutdown overvoltage protection; short-circuit and fan-failure protection
• No overshoot at turn-on, turn-off, or power failure
• Remote sensing provision eliminates lead-resistance effects on DC regulation
• Remote voltage programming (volt per volt capability)
• TTL-compatible remote turn-on/turn-off control (2.8–5.0 V off; 0–0.5 V or open circuit for on)
• UL recognized, TÜV licensed, CSA certified
– Physical Specifications
Dimensions: 1.9 × 4.75 × 5.687 inches. Weight: 2.30 lbs (ship weight). Convection cooling—no forced-air ventilation required.
– Typical Applications
Industrial process control, telecommunications equipment, test instrumentation, and OEM systems where stable 28 V power and global AC input flexibility are essential.
