The Lambda / TDK / EMI ESS54-190-2-D-1480 is a programmable DC power supply engineered for high-current OEM and laboratory applications requiring reliable constant voltage and constant current operation. This 5U rack-mount unit delivers automatic CV/CC crossover with pulse-by-pulse current limiting and fast transient response. While the ESS series has provided stable performance since 1995, TDK-Lambda recommends the Genesys™ or GENESYS+™ series for new design implementations.
## Technical Specifications
**Electrical Performance**
• Constant Voltage (CV) and Constant Current (CC) operation with automatic crossover
• Pulse-by-pulse current limit for fast recovery
• Power factor: 0.9
• Efficiency: 85% to 91%
• Output stability: ±0.05% maximum deviation over eight hours (constant line, load, temperature)
• Voltage temperature coefficient: 0.02% per °C of rated output voltage
• Current temperature coefficient: 0.03% per °C of rated output current
• Transient response: <650 microseconds for 30% load step (≤20 V units); scales by Vmax/20 for higher voltages
• Inrush current limiting via power thermistor
**Environmental**
• Operating temperature: 0°C to 50°C continuous duty; derate 4% per °C above 50°C
• Storage temperature: -55°C to 85°C
## Key Features
• Ten-turn potentiometers for voltage and current adjustment
• Dual analog meters displaying simultaneous output current and voltage indication
• LED status indicators: Overvoltage Condition, Inverter Failure, Phase Loss, Control Failure
• UL-listed primary circuit breaker with integrated on/off control
• Analog programming and monitoring on rear panel
• Optional RS232/IEEE 488 interface capability
• Remote start/stop control via external AC or DC voltage source
## Typical Applications
High-current device testing, power conversion evaluation, component qualification, and laboratory research requiring stable programmable DC output with rapid load transient recovery.
## Compatibility & Integration
Analog control and monitoring via rear panel connectors; optional legacy interface support through RS232/IEEE 488 modules.
