The TDK-Lambda GEN40-85 is a programmable DC power supply engineered for industrial, laboratory, and OEM applications requiring stable, regulated power delivery. Part of the Genesys™ family, this 3400 W unit delivers 0–40 Vdc at 0–85 A with 86% typical efficiency and exceptionally low output noise. It operates from single-phase or three-phase AC input across 47–63 Hz, with automatic active power factor correction at 0.99 typical. The supply features dual independent encoder controls, constant voltage/constant current auto-crossover, and comprehensive protection including adjustable overvoltage protection, undervoltage lockout, and over-temperature shutdown. RS-232 and RS-485 communications come standard; optional interfaces include LAN (LXI Class C), USB, GPIB, and isolated analog control. Up to 31 units daisy-chain over RS-485, or four units parallel with active current sharing. The 2U rack-mount form factor measures 423 × 88 × 442.5 mm and weighs 13 kg typical.
## Technical Specifications
• **Output:** 0–40 Vdc, 0–85 A, 3400 W rated
• **Voltage Ripple Noise:** 0.008 Vrms (5 Hz–1 MHz)
• **Current Ripple Noise:** 0.2 Arms (5 Hz–1 MHz)
• **Efficiency:** 86% typical
• **Power Factor Correction:** 0.99 typical (active)
• **Input (Single Phase):** 170–265 Vac, 47–63 Hz
• **Input (Three Phase 208 V/400 V/480 V):** 170–265 Vac / 342–460 Vac / 432–528 Vac, 47–63 Hz
• **Operating Temperature:** 0–50 °C
## Key Features
• Constant voltage/constant current operation with automatic crossover
• Dual digital display with voltage and current readout
• Analog programming selectable 0–5 V or 0–10 V via DIP switches
• Adjustable overvoltage protection, undervoltage lockout, and current foldback
• Last-setting memory or safe restart user selection
• Parallel operation: up to four units with active current sharing
• Multi-drop control: up to 31 units on RS-485 daisy chain
## Interfaces & Integration
• Standard: RS-232, RS-485
• Optional: LAN (LXI Class C), USB, GPIB (IEEE 488.2), isolated analog voltage and current control
## Typical Applications
Charging and testing battery packs, powering RF and microwave test equipment, semiconductor burn-in and characterization, and industrial process control requiring stable DC output with networked remote control.
