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20 Watt

2:1 and 4:1 Input Range


CWA20 and CWB20 DC-DC Converters Approved for Medical Applications

With 90-percent efficiency, our CWA20 and CWB20 series of DC-DC converters feature wide input voltage ranges of 2:1 and 4:1, respectively, reinforced insulation of 5,000 Vac and 2 X MOPP. Units integrate EMI Class A filters, as well as overvoltage, overcurrent, overtemperature and short circuit protection—all housed in a 1 x 1.6-inch package. Both series meet medical safety approvals including UL 60601-1, and are compliant to RoHS EU Directive 2011/65/EU.

CWA20_CWB20_Series

INPUT

  • Voltage range, Vdc:
    • 9 Min., 12 Typ., 18 Max. 18 Vin (nom), 2:1
    • 18 Min., 24 Typ., 36 Max. 36 Vin (nom), 2:1
    • 36 Min., 48 Typ., 75 Max. 75 Vin (nom), 2:1
    • 9 Min., 24 Typ., 36 Max. 36 Vin (nom), 4:1
    • 18 Min., 48 Typ., 75 Max. 75 Vin (nom), 4:1
  • Start up voltage, Vdc
    • 9 Max. 12 Vin (nom), 2:1
    • 18 Max. 24 Vin (nom), 2:1
    • 36 Max. 48 Vin (nom), 2:1
    • 9 Max. 24 Vin (nom), 4:1
    • 18 Max. 48 Vin (nom), 4:1
  • Shutdown voltage, Vdc
    • 7.8 Min., 8 Typ., 8.6 Max. 12 Vin (nom), 2:1
    • 15.8 Min., 16 Typ., 17.4 Max. 24 Vin (nom), 2:1
    • 32 Min., 33 Typ., 34 Max. 48 Vin (nom), 2:1
    • 7.8 Min., 8 Typ., 8.6 Max. 24 Vin (nom), 4:1
    • 15.8 Min., 16 Typ., 17.4 Max. 48 Vin (nom), 4:1
  • Start up time, ms
    • 30 Typ., 60 Max. Power up, Constant resistive load
    • 30 Typ., 60 Max. Remote ON/OFF
  • Input surge voltage, Vdc
    • 3 seconds, Max.
    • 25 Max. 12 Vin (nom), 2:1
    • 50 Max. 24 Vin (nom), 2:1
    • 100 Max. 48 Vin (nom), 2:1
    • 50 Max. 24 Vin (nom), 4:1
    • 100 Max. 48 Vin (nom), 4:1
  • Input filter: Pi type
  • Remote ON/OFF, mA
    • Referred to - Vin pin
    • Open or 3.5 - 12 Vdc DC-DC ON, Positive logic
    • Short or 0 - 1.2 Vdc DC-DC OFF, Positive logic
    • Short or 0 - 1.2 Vdc DC-DC ON, Negative logic
    • Open or 3.5 - 12 Vdc DC-DC OFF, Positive logic
    • -0.5 Min., 1 Max. Input current of Ctrl pin
    • 2.5 Typ. Remote off input current

OUTPUT

  • Voltage accuracy, % -1 Min., 1 Max.
  • Line regulation, %:
    • -0.2 Min., 0.2 Max., Low line to high line at full load, Single
    • -0.5 Min., 0.5 Max., Dual
  • Load regulation, %:
    • -0.2 Min., 0.2 Max. No load to full load, Single
    • -1 Min., 1 Max. Dual
  • Cross regulation, %: -5 Min., 5 Max. Asymmetrical load 25%/100% FL, Dual
  • Voltage adjustability, %:
    • -10 Min., 10 Max. Single output, 5Vout, 12Vout
    • -10 Min., 20 Max. 15Vout, 24Vout
  • Ripple and noise, mVp-p:
    • Measured by 20MHz bandwidth
    • 50 Typ. Single, 5Vout, With a 10µF/25V X7R MLCC
    • 75 Typ. Single, 12Vout, With a 10µF/25V X7R MLCC
    • 75 Typ. Single, 15Vout, With a 10µF/25V X7R MLCC
    • 100 Typ. Single, 24Vout, With a 4.7µF/50V X7R MLCC
    • 50 Typ. Dual, ±5Vout, With a 10µF/25V X7R MLCC
    • 75 Typ. Dual, ±12Vout, With a 10µF/25V X7R MLCC
    • 75 Typ. Dual, ±15Vout, With a 10µF/25V X7R MLCC
  • Temperature coefficient, %/ºC: -0.02 Min., 0.02 Max
  • Transient response recovery time, μs: 250 Typ. 25% load step change
  • Over voltage protection, Vdc:
    • 6.2, 5Vout, Zener diode clamp
    • 15, 12Vout
    • 20, 15Vout
    • 30, 24Vout
  • Over load protection, %: 150 Typ., 185 Max., % of lout rated; Hiccup mode
  • Short circuit protection: Continuous, automatic recovery

GENERAL SPECIFICATIONS

  • Isolation Voltage, Vac: 1 minute, input to output, reinforced insulation for 250 Vac working voltage, 5000 Min.
  • Isolation capacitance, pF: 20 Typ.
  • Leakage currect, μA: 240 Vac, 60 Hz, 2 Typ., 2.5 Max.
  • Switching frequency, kHz: 225 Min., 250 Typ., 285 Max.
  • Clearance/creepage, mm: 8 Min.

ENVIRONMENTAL SPECIFICATIONS

  • Operating ambient temperature °C: With derating -40 Min. +105 Max.
  • Maximum case temperature, °C: +105 Max.
  • Over temperature protection °C: 115 Typ.
  • Storage temperature range: -55 Min., 125 Max.
  • Thermal impedance: 14.36 Typ.
  • Operating Altitude, m: 5000 Max.
  • Thermal shock: MIL-STD-810-F
  • Vibration: MIL-STD-810-F
  • Relative humidity: 5% to 95% RH

PHYSICAL SPECIFICATIONS

  • Design meet safety standard:
    • IEC/EN/ANSI/AAMI ES 60601-1, UL:E360199
    • IEC/EN/UL 60950-1, 62368-1, UL:E193009, CB:UL(Demko)
  • Case material: Non-conductive black plastic
  • Base material: Non-conductive black plastic
  • Potting material: Silicone, (UL94 V-0)
  • Dimensions: 1.0" x 1.6" x 0.4" (25.4 x 40.6 x 10.2 mm)
  • Weight: 24g (0.85oz)
  • MTBF: 1.712 × 106 hrs, MIL-HDBK-217F, Full load

EMC SPECIFICATIONS

  • EMI: EN55011, EN55032 and FCC Part 18, Without external components, Class A | With external components, Class B
  • ESD: EN61000-4-2, Air ±15kV and Contact ±8kV, Perf. Criteria A
  • Radiated immunity: EN61000-4-3, 10V/m, Perf. Criteria A
  • Fast transient: EN61000-4-4, ±2KV, Perf. Criteria A
  • Surge: EN61000-4-6, ±2KV, Perf. Criteria A
  • Conducted immunity: EN61000-4-6, 10Vr.m.s, Perf. Criteria A
  • Power frequency magnetic field: EN61000-4-8, 100A/m continuous; 1000A/m 1 second, Perf. Criteria A
Input Range
(Vdc)
Output Voltage
(Vdc)
Output Current @ Full load
(mA)
Input Current
@ No Load
(mA)
Efficiency
(%)
Max. Capacitor Load
(μF)
Model Number
9 - 18 5 4000 8 88.5 5000 CWA20-12S5
9 - 18 12 1670 12 88.5 850 CWA20-12S12
9 - 18 15 1330 13 89 700 CWA20-12S15
9 - 18 24 833 11 89 220 CWA20-12S24
18 - 36 5 4000 8 90 5000 CWA20-24S5
18 - 36 12 1670 9 90 850 CWA20-24S12
18 - 36 15 1330 9 90 700 CWA20-24S15
18 - 36 24 833 9 90 220 CWA20-24S24
36 - 75 5 4000 9 89.5 5000 CWA20-48S5
36 - 75 12 1670 9 88.5 850 CWA20-48S12
36 - 75 15 1330 9 89 700 CWA20-48S15
36 - 75 24 833 9 88.5 220 CWA20-48S24
9 - 18 ±5 ±2000 11 86 ±2500 CWA20-12-5
9 - 18 ±12 ±833 11 89 ±500 CWA20-12-12
9 - 18 ±15 ±667 14 89 ±350 CWA20-12-15
18 - 36 ±5 ±2000 11 86 ±2500 CWA20-24-5
18 - 36 ±12 ±833 9 90 ±500 CWA20-24-12
18 - 36 ±15 ±667 11 90 ±350 CWA20-24-15
36 - 75 ±5 ±2000 9 86 ±2500 CWA20-48-5
36 - 75 ±12 ±833 9 88.5 ±500 CWA20-48-12
36 - 75 ±15 ±667 9 89 ±350 CWA20-48-15
9 - 36 5 4000 8 88.5 5000 CWB20-24S5
9 - 36 12 1670 11 88.5 850 CWB20-24S12
9 - 36 15 1330 10 89 700 CWB20-24S15
9 - 36 24 833 10 88.5 220 CWB20-24S24
18 - 75 5 4000 9 89.5 5000 CWB20-48S5
18 - 75 12 1670 9 89.5 850 CWB20-48S12
18 - 75 15 1330 9 89 700 CWB20-48S15
18 - 75 24 833 9 88.5 220 CWB20-48S24
9 - 36 ±5 ±2000 9 86 ±2500 CWB20-24-5
9 - 36 ±12 ±833 10 88.5 ±500 CWB20-24-12
9 - 36 ±15 ±667 11 89 ±350 CWB20-24-15
18 - 75 ±5 ±2000 9 86 ±2500 CWB20-48-5
18 - 75 ±12 ±833 9 88.5 ±500 CWB20-48-12
18 - 75 ±15 ±667 9 89 ±360 CWB20-48-15