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20 Watt

Single and Dual Output For Railway Applications

Efficient and reliable for railroad safety

Designed for railway applications, our 20 watt single and dual output DC-DC converter meets UL60950-1, EN60950-1, IEC60950-1 and EN50155 standards and has an output current up to 2.4 A. This model also features a standard 1.00" x 2.00" x 0.40" package and its CE mark meets 2006/95/EC, 93/68/EEC and 2004/108EC.

INPUT

  • Voltage Range
    • 24 Vdc nominal input: 18 - 36 Vdc
    • 48 Vdc nominal input: 36 - 75 Vdc
    • 110 Vdc nominal input: 43 - 160 Vdc
  • Input Filter: Pi Filter
  • Input Surge Voltage
    • 24 Vdc input: 50 Vdc 1 sec, max.
    • 48 Vdc input: 100 Vdc 1 sec, max.
    • 110 Vdc input: 170 Vdc 1 sec., max.
  • Input Reflected Ripple Current Normal input and full load: 30 mAp-p
  • Startup Time
    • Normal input and constant resistive load
      • Power up: 30 ms, max.
      • Remote On/On 30 ms, max.
  • Startup Voltage
    • 24 Vdc input: 9 Vdc, max.
    • 48 Vdc input: 18 Vdc, max.
    • 110 Vdc input: 43 Vdc, max.
  • Shutdown Voltage
    • 24 Vdc input: 8 Vdc
    • 48 Vdc input: 16 Vdc
    • 110 Vdc input: 40 Vdc
  • Remote ON/OFF
    • Positive Logic (Option)
      • DC-DC ON: Open or 3V < Vr < 15V
      • DC-DC OFF: Short or 0V < Vr < 1.2V
    • Negative Logic (Standard)
      • DC-DC ON: Short or 0V < Vr < 1.2V
      • DC-DC OFF: Open or 3V < Vr < 15V
  • Input Current of Remote Control Pin
    • Nominal input: -0.5 mA - 1.0 mA
  • Remote off state input current
    • Nominal input: 2.5 mA

OUTPUT

  • Output Power: 20 Watts
  • Voltage Accuracy: ±1%
  • Minimum Load: 0%
  • Voltage Adjustability
    • Single: ±10%
  • Line Regulation:
    • LL to HL at Full Load
      • Single: ±0.2%
      • Dual: ±0.5%
  • Load Regulation
    • No Load to Full Load
      • Single: ±0.2%
      • Dual: ±1.0%
    • 10% Load to 90% Load
      • Single: ±0.1%
      • Dual: ±0.8%
  • Cross Regulation Asymmetrical Load 25%/100% FL
    • Dual: ±5%
  • Ripple and Noise 20MHz band width: 75 - 100 mVp-p
    • Measured with a 1u50F/50V X7R MLCC
  • Temperature Coefficient: ±0.2%/°C, max.
  • Transient Response recovery time
  • 25% load step change: 250μS
  • Over voltage protection
    • 3.3 Vdc output: 3.7 Vdc - 5.4 Vdc
    • 5 Vdc output: 5.6 Vdc - 7.0 Vdc
    • 12 Vdc output: 13.5 Vdc - 19.6 Vdc
    • 15 Vdc output: 16.8 Vdc - 20.5 Vdc
  • Overload Protection
    • Percent of FL at nominal input: 150%
  • Short Circuit Protection: Hiccup, automatic recovery

GENERAL

  • Efficiency: 85 - 89%
  • Isolation Voltage
    • Input to Output: 1600 Vdc, min. 1 minute
    • Input (Output) to Case: 1000 Vdc, min. 1 minute
  • Isolation Resistance: 109 ohms, min.
  • Isolation Capacitance: 3000 pF, max.
  • Switching Frequency: 330 KHz, ±10%
  • Approvals and Standards: IEC60950-1, UL60950-1, EN60950-1, EN50155
  • Case Material: Nickel coated copper
  • Base material: FR4 PCB
  • Potting Material: Silicon (UL94-V0)
  • Dimensions: 1.00 x 2.00 x 0.40 inches (25.4 x 50.8 x 10.2 mm)
  • Weight: 30 g (1.06 oz.)

MTBF

  • BELLCORE TR-NWT-000332: 1.630 x 106 hrs
  • MIL-HDBK-217F: 4.950 x 105 hrs

ENVIRONMENTAL

  • Operating Ambient Temperature: -40 to 101°C with derating
  • Maximum Case Temperature: 105°C
  • Storage Temperature Range: -55 to 125°C
  • Thermal Impedance
    • Natural Convection: 12°C
    • Natural Convection with Heat Sink: 10°C
  • Thermal Shock: EN61373, MIL-STD-810F
  • Vibration: EN61373, MIL-STD-810F
  • Relative Humidity: 5 - 95% RH

EMC CHARACTERISTICS

  • EMI: EN55022, EN55011
    • 24 Vdc, 48 Vdc: Class B
    • 110 Vdc: Class A
  • ESD, EN61000-4-2, Perf. Criteria A
    • Air: ±8KV
    • Contact: ±6KV
  • Radiated Immunity: EN61000-4-3, 20 V/m, Perf. Criteria A
  • Fast Transient: EN61000-4-4, ±2KV, Perf. Criteria A
  • Surge: EN61000-4-5, ±2KV, Perf. Criteria A
  • Conducted Immunity: EN61000-4-6, 10 Vrms, Perf. Criteria A
    Output Current (mA)          
Input Voltage Range (Vdc) Output Voltage
(Vdc)		 Min. load Full load Output Ripple & Noise Input Current No load
(mA)		 Efficiency (%) Model Number Capacitor Load max.
Single Output
9-36

 3.3 0 4500 75mVp-p 6 85 RWB20-24S33 7000μF
5 0 4000 75mVp-p 6 88 RWB20-24S5 5000μF
12 0 1670 100mVp-p 6 89 RWB20-24S12 850μF
15 0 1330 100mVp-p 6 88 RWB20-24S15 700μF
18-75


 3.3 0 4500 75mVp-p 4 85 RWB20-48S33 7000μF
5 0 4000 75mVp-p 4 88 RWB20-48S5 5000μF
12 0 1670 100mVp-p 4 89 RWB20-48S12 850μF
15 0 1330 100mVp-p 4 89 RWB20-48S15 700μF
43-160


 3.3 0 4500 75mVp-p 3 85 RWB20-10S33 7000μF
5 0 4000 75mVp-p 3 87 RWB20-110S5 5000μF
12 0 1670 100mVp-p 3 88 RWB20-10S12 850μF
15 0 1330 100mVp-p 3 88 RWB20-25S15 700μF
Dual Output
9-36 ±12 0 ±833 100mVp-p 6 88 RWB20-24-12 ±500μF
±15 0 ±667 100mVp-p 6 89 RWB20-24-15 ±350μF
18-75 ±12 0 ±833 100mVp-p 4 88 RWB20-48-12 ±500μF
±15 0 ±667 100mVp-p 4 89 RWB20-48-15 ±350μF
43-160 ±12 0 ±833 100mVp-p 3 88 RWB20-110-12 ±500μF
±15 0 ±667 100mVp-p 3 89 RWB20-110-15 ±350μF