The Lambda/TDK LK340A is a programmable DC power supply delivering regulated constant voltage and constant current output with remote sensing and electronic load protection. It accommodates dual AC input ranges (105–132 VAC standard, or 187–242 VAC with suffix “v”) at 57–63 Hz, with 10% current derating for 50 Hz operation. The supply features front-panel coarse and fine adjustment controls for voltage and current, coupled with automatic electronic current limiting settable to 105% of rated output. Voltage regulation maintains less than 10 mA or 0.1% (whichever is greater) across line and load variations. Output ripple and noise are specified at 500 µV RMS (20 MHz bandwidth) with a temperature coefficient of 0.015%/°C. Constant current regulation achieves 0.015% or 1 mV (whichever is greater) for both line and load transients. Remote sensing eliminates lead-resistance effects on DC output regulation, while remote programmability via voltage or resistance input (nominal 200 ohms/volt) enables external control. The supply includes fused protection on both AC input and load circuits, automatic thermal shutdown with reset, and provisions for external overvoltage protection modules. Heavy-duty rear-mounted terminal blocks provide power connections.
Technical Specifications
• AC Input: 105–132 VAC, 57–63 Hz (standard); optional 187–242 VAC, 57–63 Hz; 10% output derating at 50 Hz
• DC Output: CV/CC operation with adjustable voltage and current controls
• Voltage Regulation: Line regulation <10 mA or 0.1%; load regulation <10 mA or 0.1%
• Output Ripple & Noise: 500 µV RMS (20 MHz bandwidth)
• Temperature Coefficient: 0.015%/°C
• Constant Current Regulation: Line and load regulation 0.015% or 1 mV (whichever is greater)
• Current Limiting: Electronic circuit, settable to 105% of rated current
• Remote Programming: Voltage or resistance mode (200 ohms/volt nominal)
– Key Features
• Remote sensing for lead-resistance compensation
• Automatic electronic current limiting and overload protection
• Dual-fuse protection (AC input and load circuits)
• Thermal protection with automatic reset
• No output overshoot during power transitions or failure events
• Compatible with external overvoltage protection modules (LHOV-4, LHOV-5, LHOV-6)
– Typical Applications
• Precision equipment testing and characterization
• Laboratory power sourcing where CV/CC operation is required
• Systems requiring remote voltage or current programming
• Applications demanding low output ripple and tight regulation
– Compatibility & Integration
The LK340A accepts external programming via voltage or resistance inputs and supports remote voltage sensing. External overvoltage protection modules are available for enhanced load safeguarding.
