The TDK-Lambda LRS-53-28 is a 225W AC/DC switching power supply engineered for industrial and demanding electronic applications requiring stable 28V DC output. This convection-cooled unit operates across dual selectable input ranges (95–132 VAC or 187–265 VAC, 47–440 Hz) and delivers ±5% adjustable voltage regulation with minimal output ripple. Built-in overvoltage and overload protection, combined with remote sensing and programming capabilities, make it suitable for mission-critical systems requiring high reliability and tight voltage control.
Technical Specifications
• Output: 28V DC (±5% adjustable)
• Power Rating: 225W maximum
• Input Voltage: 95–132 VAC or 187–265 VAC (user-selectable), 47–440 Hz
• Efficiency: 67% minimum
• Output Ripple & Noise: 10mV RMS, 35mV pk-pk
• Line Regulation: 0.1%
• Load Regulation: 0.1%
• Temperature Coefficient: 0.03%/°C
• Hold-up Time: ≥16.7 msec (at full load, Vmax, 105VAC input, 60Hz)
• Operating Temperature: −10°C to +71°C continuous (derating above 40°C)
• Storage Temperature: −55°C to +85°C
• Dimensions: 2.375 × 4.875 × 8.0 inches
• Weight: 3.10 lbs (net)
– Key Features
• Convection cooling—no fans or blowers required
• Soft-start in-rush current limiting (≤4× steady-state input current)
• Automatic electronic self-resetting current limiting
• Overvoltage protection via inverter drive removal
• Remote sensing provision to eliminate lead-resistance voltage drop
• Remote programming: 1000 Ω/Volt input impedance
• Two mounting surfaces and positions available
• Barrier strip input/output terminals with screw outputs (10-32 × 1/2″ LG)
• Inherently fungi-inert construction
• FCC Class A EMI compliance (MIL-STD-461A Notice 4 CE04)
• UL Recognized, CSA Certified
• MIL-STD-810C environmental qualification (pressure, temperature, humidity, vibration, shock)
– Typical Applications
Industrial automation systems, process control equipment, telecommunications infrastructure, avionic ground support, and military/defense platforms requiring regulated 28V DC with high environmental and electrical standards compliance.
– Compatibility & Integration
External fuse required for safety certification. Dual input voltage selection accommodates global 115VAC and 230VAC distributions. Remote sensing eliminates regulation errors in long-run applications.
