RHDW20-110S12
20W railway-certified DC-DC converter with 14-160V input, 12V output, and EN 50155 certification for rolling stock.
Product Overview
Description
The RHDW20-110S12 from P-Duke is a compact 20W DC-DC converter designed for railway applications. Featuring an ultra-wide 14-160V input range (14:1), this converter handles all standard railway battery voltages. The regulated 12V output at up to 1.67A is ideal for sensors, control circuits, and communication interfaces. Full EN 50155, EN 61373, and EN 45545-2 HL3 certifications ensure compliance with railway standards. With operating temperature range from -40°C to +105°C and comprehensive transient protection, the RHDW20-110S12 provides reliable power for railway subsystems.
Product Series
RHDW
Primary Application
Sensor power supplies
Key Features
- 20W output power with 12V at 1.67A
- Ultra-wide 14-160V input range (14:1)
- EN 50155, EN 61373, EN 45545-2 certified
- Operating temperature -40°C to +105°C
- 4000V DC reinforced isolation
- High efficiency 89%
- Compact DIP-16 package
- 100% burn-in tested
Specifications
| outputPower | 20W |
|---|---|
| inputVoltage | 14-160V DC |
| outputVoltage | 12V DC |
| outputCurrent | 1.67A |
| efficiency | 89% |
| isolation | 4000V DC |
| operatingTemperature | -40°C to +105°C |
| package | DIP-16 |
| mtbf | 900,000 hours |
Applications
Sensor power supplies
Sensor signal conditioning
Control circuits
Industrial automation and control
Communication interfaces
Communication and interface
Monitoring systems
Electronic system design
Door sensors
Sensor signal conditioning
HVAC sensors
Sensor signal conditioning
Lighting controls
Industrial automation and control
Auxiliary systems
Electronic system design
FAE Expert Insights
"The RHDW20-110S12 is an excellent choice for lower-power railway applications. The 20W output is perfect for sensors, control circuits, and communication interfaces that don't need high power. The 14:1 input range is the key feature - it handles every railway battery system I've worked with, eliminating the need for voltage-specific models. I've used these extensively in door control sensors, HVAC monitoring, and passenger counting systems. The compact DIP-16 package saves valuable PCB space in equipment cabinets. The full EN 50155 certification gives confidence for rolling stock applications. What I particularly appreciate is the high MTBF - 900,000 hours is exceptional for this power class. For railway subsystems needing moderate power, this converter delivers excellent reliability and value."
Compact railway converter with ultra-wide input for sensor and control applications
— Lisa Chen, BeiLuo
Frequently Asked Questions
What is the no-load power consumption?
The RHDW20-110S12 has low no-load power consumption: No-load input current is less than 15mA at 110V input; This corresponds to approximately 1.65W no-load power consumption; At lower input voltages, no-load current is proportionally higher; At higher input voltages, no-load current is slightly lower due to constant power control. The low no-load consumption is achieved through: Burst-mode operation at light loads; Optimized control circuits; Low quiescent current design. For battery-powered applications or energy-efficient designs, the low no-load power is beneficial. When the converter is enabled but unloaded, power consumption remains low, reducing energy waste and heat generation.
For battery-powered applications, consider no-load power consumption in your energy budget calculations.
What is the switching frequency?
The RHDW20-110S12 uses a fixed switching frequency optimized for railway applications: Nominal switching frequency is 300kHz; The frequency is fixed to avoid interference with communication systems; Frequency dithering may be used to spread EMI spectrum; Synchronization input available on some models for system-level synchronization. The 300kHz frequency provides: Good balance between magnetic component size and switching losses; Easy filtering for conducted EMI compliance; No interference with typical communication frequencies; Reliable operation across the wide input voltage range. For applications requiring specific switching frequencies or synchronization, contact P-Duke for available options. The fixed frequency simplifies EMI filter design and system integration.
For applications with sensitive communication equipment, verify switching frequency does not interfere with system frequencies.
What is the output voltage tolerance?
The RHDW20-110S12 provides tight output voltage regulation: Initial accuracy is +/-1% at 25°C; Line regulation is +/-0.2% across input voltage range; Load regulation is +/-0.5% from no load to full load; Temperature drift is +/-0.02%/°C; Overall tolerance is +/-2% over all conditions. The tight regulation is achieved through: Precision voltage reference; Feedback control with compensation; Temperature-compensated components; Careful PCB layout for noise immunity. For applications requiring even tighter regulation: Select models with remote sense if available; Add external linear regulation for critical circuits; Consider the impact of load transients on voltage deviation. The standard +/-2% tolerance is suitable for most digital and analog circuits used in railway applications.
For applications requiring very tight voltage regulation, verify tolerance meets your system requirements.
What is the soft-start time?
The RHDW20-110S12 features controlled soft-start for reliable operation: Soft-start time is typically 50ms from enable to full output; Output voltage ramps smoothly to prevent inrush current; Soft-start is active on both power-up and enable activation; The controlled startup protects input capacitors and prevents EMI issues. The soft-start characteristics include: Monotonic voltage rise without overshoot; Controlled di/dt to limit inrush current; Automatic soft-start on every startup; No external components required. For applications requiring different startup characteristics: Some models offer adjustable soft-start; Contact P-Duke for special requirements; Consider load characteristics during startup (capacitive loads may extend startup time). The standard soft-start is suitable for most railway applications.
For applications with specific startup timing requirements, verify soft-start characteristics meet your needs.
What is the remote on/off control?
The RHDW20-110S12 includes remote on/off control for system management: Remote on/off is referenced to input negative; Logic high (>3V) enables the converter; Logic low (<0.8V) disables the converter; Internal pull-up allows simple switch connection. The remote control features include: Positive logic - high enables, low disables; Can be driven by open-collector or open-drain outputs; Internal 5V pull-up through resistor; Control current less than 1mA. For system integration: Connect to microcontroller GPIO for software control; Use for power sequencing in multi-rail systems; Implement for power saving during standby modes. The remote on/off provides flexibility for system power management and sequencing in complex railway control systems.
For power management applications, utilize remote on/off control for system sequencing and power saving.
What is the trim range for output voltage?
The RHDW20-110S12 allows output voltage trimming for calibration: Trim range is typically +/-10% of nominal voltage; External resistor connects between trim pin and output or ground; Increasing resistance above output raises voltage; Decreasing resistance below output lowers voltage. The trim characteristics include: Trim pin is referenced to output negative; Trim resistor values specified in datasheet; Monotonic adjustment without instability; Retains regulation performance across trim range. For applications requiring voltage adjustment: Calculate trim resistor using formulas in datasheet; Use precision resistors for accurate setting; Consider temperature coefficient of trim resistors. The trim feature allows system calibration and compensation for cable drops in distributed power systems.
For applications requiring output voltage adjustment, use the trim feature following datasheet guidelines.