The Lambda/TDK/EMI LPD421A-FM is a dual-output regulated DC power supply engineered for laboratory and rack-mounted applications requiring stable, independent voltage control. Each output adjusts from 0 to 20 VDC independently, with series/parallel configurations supporting 0–40 VDC and current expansion to 3.4 A. The supply delivers exceptional line and load regulation of 0.01% + 1 mV, output ripple of 500 µV RMS (1.5 mV pk-pk), and temperature stability of (0.015% + 0.5 mV)/°C across a 0°C to +60°C continuous duty range.
Technical Specifications
Output Ratings
• Voltage: 0–20 VDC per output; 0–40 VDC in series configuration
• Current per output: 1.7 A @ 30°C; 1.5 A @ 40°C; 1.3 A @ 50°C; 1.0 A @ 60°C
• Series/parallel current: up to 3.4 A
• Line/load regulation: 0.01% + 1 mV
• Output ripple: 500 µV RMS / 1.5 mV pk-pk
• Temperature coefficient: (0.015% + 0.5 mV)/°C
Input Power
• AC voltage: 105–132 VAC, 187–242 VAC, or 205–265 VAC (configuration dependent)
• Frequency: 47–440 Hz (derate 10% for 47–53 Hz operation)
Physical & Thermal
• Dimensions: 5-3/16″ H × 8-3/8″ W × 10-5/8″ D
• Weight: 13 lbs net / 16 lbs shipping
• Cooling: Convection design; no blowers or external heat sinks required
• Panel finish: Tan glass-filled, flame-retardant nylon
– Key Features
• Five-way binding posts on front panel for each output
• Remote sensing provision to compensate for lead resistance effects
• Remote programmable voltage control
• Series/parallel and auto series/parallel (master-slave) tracking capability
• Heavy-duty rear terminal block for permanent connections
– Compatibility & Integration
The LPD421A-FM accommodates standard 19″ rack mounting via optional Lambda rack adapters (LRA-1, LRA-2). External overvoltage protection modules (LHOV-4, LHOV-5, LHOV-6) are available for enhanced system protection. Dual outputs support independent or linked operation for voltage multiplication (series) or current expansion (parallel) up to 3.4 A total.
