DCDC
Specification
20 Watts
•72 & 110 VDC Input for Railway Applications
•Single and Dual Outputs
•1500 VAC Basic Isolation
•High Power Density
•High Efficiency Up to 88%
•Remote On/Off
•3 Year Warranty
RDC Series
Input
Input Voltage Range • 72 V (36-140 VDC), 110 V (55-176 VDC)
Input Current • See table
Input Reflected Ripple • 20 mA pk-pk through 12 µH inductor
Input Filter • Pi network
Undervoltage Lockout • 72 V models: ON 33.5 V, OFF 30.5 V typ.
110 V models: ON 52.5 V, OFF 48.5 V typ.
Input Surge • 72 V models 150 VDC for 100 ms
110 V models 185 VDC for 100 ms
Output
Output Voltage • See table
Output Voltage Trim • ±10% on single outputs models only
Minimum Load • No minimum load required
Line Regulation • ±0.2% max
Load Regulation • Single output models: ±0.5% max,
Dual output models: ±1% max balanced
outputs
Cross Regulation • ±5% (see note 2)
Setpoint Accuracy • ±1%
Start Up Time • 30 ms typical
Ripple & Noise • 100 mV or 1% pk-pk for single output
models, 150 mV or 1% pk-pk for dual
output model, whichever is greater,
20 MHz bandwidth (see note 3)
Transient Response • 4% max deviation, recovery to within
1% in <500 µs for a 25% load change
Temp. Coefficient • 0.02%/°C
Overvoltage Protection • 3.3 V models: 3.9 V typical, 5 V models:
6.2 V typical, 12 V models: 15 V typical
15 V models: 18 V typical, ±5 V models:
±6.2 V typical, ±12 V models: ±15 V typical
±15 V models: ±18 V typical
Overload Protection • >150% of full load
Short Circuit Protection • Trip & restart (hiccup mode), auto recovery
Overtemperature • 115 °C typical
Protection
Remote On/Off • On = Logic High (>3.0) or Open
Off = Logic Low (<1.2 V) or short pin 2 to 3
Maximum Capacitive • See table
Load
xppower.com
General
Efficiency • See table
Isolation Voltage • 1500 VAC Input to Output
1600 VDC Input to Case
1600 VDC Output to Case
Isolation Capacitance • 2000 pF
Switching Frequency • 270 kHz typical
Power Density • 25 W/in3
MTBF • 400 kHrs min to MIL-HDBK-217F at 25 °C,
GB
Environmental
Operating Temperature • -40 °C to +85 °C (see derating curve)
Case Temperature • +105 °C max
Cooling • Convection-cooled
Operating Humidity • 5-95% RH, non-condensing
Storage Temperature • -40 °C to +125 °C
EMC
General • Complies with EN50121-3-2, Railway
Applications - Electromagnetic
Compatibility for Rolling Stock Apparatus
Emissions • EN55011, 79 dBµV (0.15-0.5 MHz)
73 dBµV (0.5-30 MHz)
ESD Immunity • EN61000-4-2, level 3, Perf Criteria A
Radiated Immunity • EN61000-4-3 20 V/m Perf Criteria A*
EFT/Burst • EN61000-4-4 level 3, Perf Criteria A*
Surge • EN61000-4-5 level 2, Perf Criteria A
Conducted Immunity • EN61000-4-6 10 V/rms, Perf Criteria A
Magnetic Field • EN61000-4-8 10 A/m, Perf Criteria A
*External input capacitor required 220 µF/250 V
03-Mar-14
DCDC
RDC20
Notes
1. Input current specified at nominal 72 V or 110 V input.
2. Cross regulation for duals is ±5% when one output is at 100% and the other is
varied between 25% and 100%.
3. Measured with 1 µF ceramic capacitor in parallel with 10 µF electrolytic
capacitor across output rails.
4. Add suffix ‘-HK’ for optional heatsink.
6
45
2
1
Bottom View
Single & Dual
Output Models
3
0.10
(2.54)
0.10
(2.54)
DIA
0.04
(1.00) DIA
0.04
(1.00)
0.10
(2.54)
0.32
(8.00)
0.30
(7.62)
0.30
(7.62)
0.20
(5.08)
0.17
(4.36)
1.73
(43.9)
2.00
(50.8)
0.02
(0.50)
0.24
(6.00)
0.64
(16.3)
0.10
(2.54)
0.40
(10.16)
0.40
(10.16)
0.40
(10.16) Optional
Heatsink
Mechanical Details
Application Notes
Load (%)
Ambient Temperature (°C)
-40
0
10
20
30
40
50
60
70
80
90
100
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
without heat-sink
with heat-sink
Derating Curve
PIN CONNECTIONS
Pin
Single Dual
1
+Vin +Vin
2
-Vin -Vin
3
Remote On/Off Remote On/Off
4
+Vout +Vout
5
-Vout Com
6
Trim -Vout
Typical Resistor
S3V3
S05 S12 S15
Trim Down 10% 15.3 kΩ5.31 kΩ5.3 kΩ5.8 kΩ
Trim Up 10% 10.3 kΩ10.6 kΩ22.1 kΩ20.0 kΩ
1. All dimensions are in inches (mm).
2. Weight: 0.07 lbs (30 g) approx
3. Pin diameter: 0.04 ±0.002 (1.0 ±0.05)
4. Pin pitch tolerance: ±0.014 (±0.35)
5. Case tolerance: ±0.02 (±0.5)
Notes
External Output Trim
R trim-up R trim-down
6
5
6
4
Output can be externally
trimmed using this method.
Contact sales for details.
On single output versions only.
Models and Ratings
Input Voltage Output Voltage Output Current Input Current(1) Maximum
Capacitive Load Efficiency Model Number(4)
No Load Full Load
36-140 VDC
3.3 V 6.00 A 20 mA 312 mA 10000 µF 88.0% RDC2072S3V3
5.0 V 4.00 A 25 mA 313 mA 6800 µF 88.5% RDC2072S05
12.0 V 1.65 A 15 mA 318 mA 1000 µF 86.5% RDC2072S12
15.0 V 1.33 A 20 mA 318 mA 700 µF 87.0% RDC2072S15
±5.0 V ±2.00 A 35 mA 319 mA ±1000 µF 87.0% RDC2072D05
±12.0 V ±0.83 A 20 mA 323 mA ±470 µF 85.5% RDC2072D12
±15.0 V ±0.67 A 20 mA 324 mA ±330 µF 86.0% RDC2072D15
55-176 VDC
3.3 V 6.00 A 15 mA 208 mA 10000 µF 86.5% RDC20110S3V3
5.0 V 4.00 A 20 mA 209 mA 6800 µF 87.0% RDC20110S05
12.0 V 1.65 A 15 mA 212 mA 1000 µF 85.0% RDC20110S12
15.0 V 1.33 A 15 mA 211 mA 700 µF 86.0% RDC20110S15
±5.0 V ±2.00 A 30 mA 211 mA ±1000 µF 86.0% RDC20110D05
±12.0 V ±0.83 A 15 mA 215 mA ±470 µF 84.0% RDC20110D12
±15.0 V ±0.67 A 15 mA 215 mA ±330 µF 85.0% RDC20110D15