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20 Watt

Single Output, 4:1 Wide Input Range


Six-sided metal shielding with epoxy encapsulation

Our 20 watt single output DC-DC converter is UL- and CE-approved and features a low profile package of 1.0" x 2.0" x 0.4" and minimum input/output isolation of 1500 Vdc. This epoxy-encapsulated design also has six-sided continuous metal shielding and an operating temperature range between -40 and 85°C.

INPUT

  • Input voltage range
    • 24V nominal input: 9 - 36 Vdc
    • 48V nominal input: 18 - 75 Vdc
  • Input filter: Pi type
  • Input surge voltage
    • 24V input: 50 Vdc, 100 mS max
    • 48V input: 100 Vdc
  • Input reflected ripple current
    • Nominal Vin and full load: 20mAp-p
  • Start up time
    • Nominal Vin and Power up: 20Ms typ.
    • Constant resistive load: Remote ON/OFF 20mS, typ.
  • Start-up voltage
    • 24V input: 9 Vdc  * 48V input: 18 Vdc
  • Shutdown Voltage
    • 24V input: 7.5 Vdc
    • 48V input: 15 Vdc
  • Remote ON/OFF
  • Positive logic (Standard)
    • DC-DC ON: Open or 3V<Vr<12V
    • DC-DC OFF: Short or OV<Vr<1.2V
  • Negative logic (Option)
    • DC-DC ON: Short or 0V<Vr<1.2V
    • DC-DC OFF: Open or 3V<Vr<12V
  • Input current of remote control pin
    • Nominal Vin: -0.5 mA - 0.5 mA
  • Remote off state input current
    • Nominal Vin: 2.5 mA

OUTPUT

  • Output power: 20 Watts, max.
  • Voltage accuracy
    • Full load and nominal Vin: ±1%
  • Minimum load: 0%
  • Voltage adjustability
    • Single output: ±10%
  • Line regulation
    • LL to HL at Full Load Single: ±0.2%
    • Dual: ±0.5%
  • Load regulation
    • No Load to Full Load Single: ±0.5%
    • Dual: ±1%
  • Cross regulation (Dual)
    • Asymmetrical load 25%/100% FL: ±5%
  • Ripple and noise (20 MHz bandwidth): 60 - 100 mVp-p (Measured with a 0.1μF/50V MLCC)
  • Temperature coefficient: ±0.02%/°C, max
  • Transient response recovery time
    • 25% load step change: 250μS
    • 3.3V output: 3.9Vdc
  • Over voltage protection
    • 5V output: 6.2 Vdc
  • Zener diode clamp
    • 12V output: 15 Vdc
    • 15V output: 18 Vdc
  • Over load protection
    • Percent of FL at nominal input: 150% typ.
  • Short circuit protection: Hiccup, automatic recovery

GENERAL

  • Efficiency: 85 - 88%
  • Isolation Voltage
    • Input to Output: 1600 Vdc, min
    • Input (Output) to Case: 1600 Vdc, min
  • Case grounding
    • Connect case to –Vin with decoupling y Cap
  • Isolation resistance: 109 ohms, min
  • Isolation capacitance: 1500 pF, max.
  • Switching frequency: 400 KHz. typ.
  • Approvals and standard: IEC60950-1, UL60950-1 EN60950-1 * Case material: Nickel-coated copper
  • Base material: FR4 PCB
  • Potting material: Epoxy (UL94-VO)
  • Dimensions: 2.00 x 1.00 x 0.40 inches (50.8 x 25.4 x 10.2 mm)
  • Weight: 27 g (0.95 oz)
  • MTBF
    • BELLCORE-TR-NWT-000332: 1.620 x 10^6 hrs
    • MIL-HDBK-217F: 6.590 x 105 hrs.

ENVIRONMENTAL

  • Operating ambient temperature
    • -40 to 66°C without derating
    • 66 to 105°C with derating
  • Maximum case temperature: 105°C
  • Storage temperature range: -55 to 125°C
  • Thermal impedance
    • Nature convection: 12°C/Watt
    • Nature convection with heat –sink: 10°C/Watt
  • Thermal shock: MIL-STD-810F
  • Vibration: MIL-STD-810F
  • Relative humidity: 5 - 95% RH

EMC CHARACTERISTICS

  • EMI: EN55022, Class A
  • ESD: EN61000-4-2
    • Air ±8KV
    • Contact ±6KV, Perf. Criteria B
  • Radiated immunity: EN61000-4-3, 10V/m, Perf. Criteria A * Fast transient: EN61000-4-4, ±2KV, Perf. Criteria B
  • Surge: EN61000-4-5, ±1KV, Perf. Criteria A
  • Conducted immunity: EN61000-4-6, 10 Vrms, Perf. Criteria A
    Output Current (mA)   Input Current (mA)      
Input Voltage Range (Vdc) Output Voltage (Vdc) Min. Load Full Load Output Ripple & Noise (mVp-p) No Load Full Load Efficiency  % Capacitor Load Max Model Number
Single Output
9 – 36 3.3 0 5500 60 50 934 85 18000μF LWB20-24S33 
5 0 4000 75 65 992 88 9600μF LWB20-24S5 
12 0 1670 75 22 1018 86 1650μF LWB20-24S12 
15 0 1330 75 22 1014 86 1050μF LWB20-24S15 
18 – 75 3.3 0 5500 60 35 467 85 18000μF LWB20-48S33 
5 0 4000 75 35 496 88 9600μF LWB20-48S5 
12 0 1670 75 15 503 87 1650μF LWB20-48S12 
15 0 1330 75 15 501 87 1050μF LWB20-48S15 
Dual Output
9 – 36 ±5   0 ±2000  100 55 992 88 ±4800μF LWB20-24-5 
±12  0 ±833  100 30 1004 87 ±825μF LWB20-24-12 
±15  0 ±667  100 30 1005 87 ±525μF LWB20-24-15 
18 – 75 ±5  0 ±2000  100 35 490 89 ±4800μF LWB20-48-5 
±12  0 ±833  100 17 496 88 ±825μF LWB20-48-12 
±15  0 ±667  100 17 496 88 ±525μF LWB20-48-15