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8 Watt

Single and Dual Output for Railway Applications

Safety-approved with optional SMD package

With an industry standard 24 PIN DIP package, our 8 watt single and dual output DC-DC converter for railway applications features an optional SMD package, output currents up to 2.4A and 88% efficiency. This model also meets railway safety standards including UL60950-1, EN60950-1, IEC60950-1 and EN50155.

TWB8

INPUT

  • Voltage Range
    • 24 Vdc nominal input: 9 - 36 Vdc
    • 48 Vdc nominal input: 18 - 75 Vdc
    • 110 Vdc nominal input: 43 - 160 Vdc
  • Input filter: Pi Filter
  • Input Surge Voltage
    • 24 Vdc input: 50 Vdc 100 ms, max.
    • 48 Vdc input: 100 Vdc 100 ms, max.
    • 110 Vdc input: 170 Vdc 100 ms, max.
  • Input Reflected Ripple Current: 20 mAp-p
  • Start up Time, Normal input and constant resistive load, Power up: 450 ms
  • 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: 42 Vdc
  • Remote ON/OFF (Note 5)
    • DC-DC ON: Open or 3V < Vr < 12V
    • DC-DC OFF: Short or 0V < Vr < 1.2V
  • Input Current of Remote Control Pin, Nominal input: -0.5 mA - 0.5 mA
  • Remote off state input current, Nominal input: 2.5 mA

*Note 5. The ON/OFF control pin voltage is referenced to -INPUT

OUTPUT

  • Output Power: 8 Watts max.
  • Voltage Accuracy: ±1%
  • Minimum Load: 0%
  • Line Regulation
    • LL to HL at Full Load: ±0.2%
    • No Load to Full Load
      • Single (DIP): ±0.5%
      • Single (SMD): ±1.0%
      • Dual (SMD, DIP): ±1.0%
  • Load Regulation
    • 10% Load to 90% Load
    • Single (DIP): ±0.3%
    • Single (SMD): ±0.8%
    • Dual (SMD, DIP): ±0.8%
  • Cross Regulation Asymmetrical Load 25%/100% FL: ±5%
  • Ripple and Noise (20 MHz band width): 50 - 75 mVp-p
  • Temperature Coefficient: ±0.2%/°C, max.
  • Transient Response recovery time, 25% load step change: 250μS
  • Over voltage protection
    • 3.3 Vdc output: 3.9 Vdc
    • 5 Vdc output: 6.2 Vdc
    • 12 Vdc output: 15 Vdc
    • 15 Vdc output: 18 Vdc
  • Overload Protection, percent of FL at nominal input: 150%
  • Short Circuit Protection: Continuous, automatic recovery

GENERAL

  • Efficiency: 82 - 87%
    • Isolation Voltage
      • Input to Output: 1600 Vdc, min. 1 minute
      • Input (Output) to Case,
        • DIP: 1600 Vdc, min. 1 minute
        • SMD: 1000 Vdc, min. 1 minute
    • Isolation Resistance
      • 500 Vdc: 109 ohms, min.
  • Isolation Capacitance: 1500 pF, max.
  • Switching Frequency: 300 kHz ±10%
  • Approvals and Standard: IEC60950-1, UL60950-1, EN60950-1, EN50155
  • Case Material: Nickel Coated Copper
  • Base Material: Non-conductive black plastic
  • Potting Material: Epoxy (UL94-V0)
  • Dimensions: 1.25 x 0.80 x 0.40 inches (31.8 x 20.3 x 10.2 mm)
  • Weight: 18 g (0.62 oz.)
  • MTBF (Note 1)
  • BELLCORE TR-NWT-000332: 2.350 x 106 hrs
  • MIL-HDBK 217F: 1.078 x 106 hrs

*Notes: 1. BELLCORE TR-NWT-000332. Case 1: 50% Stress, Temperature at 40°C. MIL-HDBK-217F Notice2 @Ta=25°C, Full load (Ground, Benign, controlled environment)

ENVIRONMENTAL

  • Operating Ambient Temperature
    • Vo:5V, 12V, 15V:
      • -40 to 78°C without derating
    • ±12V, ±15V:
      • 78 to 105°C with derating
      • -40 to 70°C without derating
    • Vo:3.3V, ±5V
      • 70 to 105°C with derating
  • Maximum Case Temperature: 105°C
  • Storage Temperature Range: -55 to 125°C
  • Thermal Impedance (Note 8), Natural Convection: 20°C/Watt
  • Thermal Shock: EN61373, MIL-STD-810F
  • Vibration: EN61373, MIL-STD-810F
  • Relative Humidity: 5 - 95% RH

EMC CHARACTERISTICS

  • EMI: EN55022, EN55011, Class A, Class B
  • 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
and Noise		 Input Current
No load
(mA)		 Efficiency
%		 Model Number Capacitor
Load max.
Single Output
9-36 3.3 0 2400 50mVp-p 40 85 TWB8-24S33 1330 μF
5 0 1600 50mVp-p 40 87 TWB8-24S5 1330 μF
12 0 666 50mVp-p 25 86 TWB8-24S12 288 μF
15 0 533 50mVp-p 25 86 TWB8-24S15 200 μF
18-75 3.3 0 2400 50mVp-p 20 85 TWB8-48S33 1330 μF
5 0 1600 50mVp-p 20 87 TWB8-48S5 1330 μF
12 0 666 50mVp-p 13 87 TWB8-48S12 288 μF
15 0 533 50mVp-p 13 88 TWB8-48S15 200 μF
43-160 3.3 0 2400 75mVp-p 8 84 TWB8-110S33 1330 μF
5 0 1600 75mVp-p 8 85 TWB8-110S5 1330 μF
12 0 666 75mVp-p 4 86 TWB8-110S12 288 μF
15 0 533 75mVp-p 4 86 TWB8-110S15 200 μF
Dual Output
9-36 ±5 0 ±800 50mVp-p 20 84 TWB8-24-5 ±900 μF
±12 0 ±333 50mVp-p 25 86 TWB8-24-12 ±133 μF
±15 0 ±267mA 50mVp-p 25 86 TWB8-24-15 ±90 μF
18-75 ±5 0 ±800 50mVp-p 10 84 TWB8-48-5 ±900 μF
±12 0 ±333 50mVp-p 13 87 TWB8-48-12 ±133 μF
±15 0 ±267mA 50mVp-p 13 87 TWB8-48-15 ±90 μF
43-160 ±5 0 ±800 75mVp-p 5 82 TWB8-110-5 ±900 μF
±12 0 ±333 75mVp-p 5 85 TWB8-110-12 ±133 μF
±15 0 ±267mA 75mVp-p 5 85 TWB8-110-15 ±90 μF