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Home > Polytron Power Supplies > Polytron TWB8 Series DC-DC Converters, 8 Watt, Single and Dual Output for Railway Applications, 1.25" x 0.80" x 0.40"
Polytron TWB8 Series DC-DC Converters, 8 Watt, Single and Dual Output for Railway Applications, 1.25" x 0.80" x 0.40"
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Price (Each): Call or e-mail for quotes or to order.
Available to Order
Item Number: TWB8
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Safety-approved with optional SMD package
With an industry standard 24 PIN DIP package, our 8-watt single and dual output TWB8 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 Series Specification Sheet PDF
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Output Current |
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Daburn Part
Number |
Input Voltage
Range (Vdc) |
Output Voltage
(Vdc) |
Min. Load |
Full Load
(mA) |
Output Ripple
& Noise
|
Input Current
No Load
(mA) |
Efficiency
% |
Minimum Capacitor Load
μF |
| Single Output |
| TWB8-24S33 |
9-36 |
3.3 |
0 |
2400 |
50mVp-p |
40 |
85 |
1330 μF |
| TWB8-24S5 |
5 |
0 |
1600 |
50mVp-p |
40 |
87 |
1330 μF |
| TWB8-24S12 |
12 |
0 |
666 |
50mVp-p |
25 |
86 |
288 μF |
| TWB8-24S15 |
15 |
0 |
533 |
50mVp-p |
25 |
86 |
200 μF |
| TWB8-48S33 |
18-75 |
3.3 |
0 |
2400 |
50mVp-p |
20 |
85 |
1330 μF |
| TWB8-48S5 |
5 |
0 |
1600 |
50mVp-p |
20 |
87 |
1330 μF |
| TWB8-48S12 |
12 |
0 |
666 |
50mVp-p |
13 |
88 |
288 μF |
| TWB8-48S15 |
15 |
0 |
533 |
50mVp-p |
13 |
88 |
200 μF |
| TWB8-110S33 |
43- 160 |
3.3 |
0 |
2400 |
75mVp-p |
8 |
84 |
1330 μF |
| TWB8-110S5 |
5 |
0 |
1600 |
75mVp-p |
8 |
85 |
1330 μF |
| TWB8-110S12 |
12 |
0 |
666 |
75mVp-p |
4 |
86 |
288 μF |
| TWB8-110S15 |
15 |
0 |
500 |
75mVp-p |
4 |
86 |
200 μF |
| Dual Output |
| TWB8-24-5 |
9-36 |
±5 |
0 |
±800 |
50mVp-p |
20 |
84 |
±900 μF |
| TWB8-24-12 |
±12 |
0 |
±333 |
50mVp-p |
25 |
86 |
±133 μF |
| TWB8-24-15 |
±15 |
0 |
±267mA |
50mVp-p |
25 |
86 |
±90 μF |
| TWB8-48-5 |
18-75 |
±5 |
0 |
±800 |
50mVp-p |
10 |
84 |
±900 μF |
| TWB8-48-12 |
±12 |
0 |
±333 |
50mVp-p |
13 |
87 |
±133 μF |
| TWB8-48-15 |
±15 |
0 |
±267mA |
50mVp-p |
13 |
87 |
±90 μF |
| TWB8-110-5 |
43-160 |
±5 |
0 |
±800 |
75mVp-p |
5 |
82 |
±900 μF |
| TWB8-110-12 |
±12 |
0 |
±333 |
75mVp-p |
5 |
85 |
±133 μF |
| TWB8-110-15 |
±15 |
0 |
±267mA |
75mVp-p |
5 |
85 |
±90 μF |
Input and Output Specifications:
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
More Specifications:
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
- 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
- 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
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