POWER ELECTRONICS DIVISION
TWR A-Series
20W, Triple Output DC/DC Converters
Among the three families of triple-output DC/DC converters in C&D’s
A-Series, the 20W 2" x 2" devices are distinguished by their unique
"power-sharing" architecture. This feature enables devices to deliver
the full 20 Watts of output power under a variety of output-loading
conditions.
FEATURES
n
cost! Highly reliable!
Low
n
20 Watts output power
Full
n
Power "user-allocated" among outputs
n
Proven SMT-on-pcb construction
n
tested; HALT tested; EMC tested
Qual
n
Output voltages: +5V/±2V or +5V/±5V
n
Ultra-wide input voltage ranges: 9-36V or 8-75V
n
Designed to meet UL950/EN60950.
BASIC insulation (all 48VIN models)
n
mark available (75V input models)
CE
n
Small packages, 2" x 2" x 0.45"
Fully
n
isolated, 500Vdc guaranteed
n
Guaranteed efficiencies to 82%
n
to +00°C operating temperature
–40
n
Modifications and customs for OEM’s
PRODUCT OVERVIEW
Each unit’s primary +5V output can source any cur-
rent up to 3 Amps (primary power = 5W); while its
auxiliary ±2/5V outputs can source currents up to
±500mA (auxiliary power = 2/5W). Devices deliver
any combination of primary plus auxiliary power as
long as the total output power does not exceed 20
Watts. This feature enables designers to select a
single device to fulfill any number of different require-
ments.
As members of C&D’s new A-Series, the 20W triples
exhibit both low cost and outstanding long-term reli-
ability. Their design combines straightforward circuit
topologies, the newest components, proven SMT-on-
pcb construction methods, and highly repeatable auto-
matic-assembly techniques. Their superior durability
is substantiated by a rigorous in-house qualification
program that includes HALT (Highly Accelerated Life
Testing).
Each device has a +5V primary output and either
±2V or ±5V auxiliary outputs. "D2A" models
achieve fully rated performance with inputs ranging
from 9 to 36 Volts. "D48A" models operate over an
input range of 8-75 Volts.
These full-featured triples have non-latching output
current limiting, input overvoltage shutdown, input
reverse-polarity protection, and output overvoltage
clamping to protect both the power converters and
their loads.
SIMPLIFIED SCHEMATIC
+V
IN
(1)
+5V
(6)
–
V
IN
(2)
ON /O FF
CONTROL
PWM
CONTROLLER
–12V (–15V)
(8)
+12V (+15V)
(5)
(4)
COMMON
(7)
OPTO
ISOLAT ION
ERROR
AMPLIFIER
For full details go to
www.cd4power.com/rohs
DC/DC CONVERTERS
MDC_TWR20W.A03
Page of 8
www.cd4power.com
POWER ELECTRONICS DIVISION
TWR A-Series
20W, Triple Output DC/DC Converters
Output
R/N (mVp-p)
Typ.
Max.
50
75
50
75
50
75
50
75
00
25
00
25
00
50
00
50
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Input
Regulation
Line
Load
±%
±%
±%
±%
±%
±%
±%
±%
±2%
±5%
±2%
±5%
±2%
±5%
±2%
±5%
Model Family
TWR-5/3000-12/500-D12A
TWR-5/3000-12/500-D48A
TWR-5/3000-15/500-D12A
TWR-5/3000-15/500-D48A
V
OUT
(V)
+5
±2
+5
±2
+5
±5
+5
±5
I
OUT
(mA)
3000
±500
3000
±500
3000
±500
3000
±500
V
IN
Nom.
(Volts)
2
48
2
48
Range
(Volts)
9-36
8-75
9-36
8-75
I
IN
(mA)
75/8
40/559
75/8
40/559
Efficiency
Min.
8%
82%
8%
8%
Typ.
82%
83%
82%
82%
Package
(Case/
Pinout)
C4, P3
C4, P3
C4, P3
C4, P3
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
For the +5V output, listed spec applies over the 0% to 00% load range. For the ±2/5V outputs,
For testing and specification purposes, "full load" is defined as 2.75A on the primary +5V output
and ±250/200mA on the auxiliary ±2/5V outputs. This corresponds to a total output power of
listed spec applies for balanced loads over the 20% to 00% load range.
Nominal line voltage, no-load/full-load conditions.
9.75W.
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
T WR
-
5
/
3000
-
15
/
500
-
D48 A
-
C
Output
Configuration:
T
= Triple
2.00
(50.80)
ME T A L C A S E
RoHS-6 compliant*
A-Series
High Reliability
Wide Range Input
Input Voltage Range:
Nominal Primary Output:
D12
= 9-36V (2V nominal)
Voltage (+5V)
D48
= 8-75V (48V nominal)
Maximum Auxilliary Output:
Maximum Primary Output
Current in mA
Currents in mA from each output
Nominal Auxiliary Output:
* Contact C&D
Voltages (±2 or ±5V)
Technologies for
availability.
0.45
(11.43)
Case C4
IN S U LA T E D B A S E
0.20 MIN
(5.08)
0.040 ±0.002 D IA .
(1.016 ±0.051)
1.800
(45.72)
0.10
(2.54)
0.200
(5.08)
5
TEMPERATURE DERATING
20
19
18
17
16
15
14
13
0.100
(2.54)
0.400
(10.16)
1
2
6
7
4
8
1.200
(30.48)
3 E Q . SP. @
0.400 ( 10.16)
2.00
(50.80)
0.40
(10.16)
B O T T O M V IE W
DIMENSIONS ARE IN INCHES (MM)
Output Power (Watts)
12
11
10
9
8
7
6
5
4
3
2
1
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
INPUT/OUTPUT CONNECTIONS
Pin
2
3
4
5
6
7
8
Ambient Temperature (°C)
Function P3
+Input
-Input
No Pin
On/Off Control
+2V/5V Output
+5V Output
Common
-2V/5V Output
Note:
For "D2A" models, the case
is connected to pin 2 (–V
IN
).
For "D48A" models, the case is
connected to pin (+V
IN
).
Dimensions are in inches (mm)
DC/DC CONVERTERS
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MDC_TWR20W.A03
Page 2 of 8
POWER ELECTRONICS DIVISION
TWR A-Series
20W, Triple Output DC/DC Converters
Absolute Maximum Ratings
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and "full-load" conditions, unless noted.
Input
Input Voltage Range:
D2A Models
D48A Models
Input Current
Input Filter Type
Overvoltage Shutdown:
D2A Models
D48A Models
Reverse-Polarity Protection
On/Off (Sync.) Control (Pin 4)
9-36 Volts (24V nominal)
8-75 Volts (48V nominal)
See Ordering Guide
Pi
40 Volts
80 Volts
Yes (Instantaneous, 6A maximum)
TTL high = off, low (or open) = on
20W max., sum of all outputs
±%
±3%
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
500Vdc, minimum
500pF
Power down to restart
5 min. max, 5V output
30 sec max.2/5V outputs
Zener/transorb clamps, magnetic feed-
Input Voltage:
"D2" Models
"D48" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
+5V Output
±2V Outputs
±5V Outputs
Output Current
Storage Temperature
Lead Temperature (soldering, 0 sec.)
44 Volts
88 Volts
Current must be <6A. Brief
duration only. Fusing recommended.
6.8 Volts, limited duration
±5 Volts, limited duration
±8 Volts, limited duration
Current limited.
Max. currents are
model dependent.
–40 to +05°C
+300°C
Output
Total Output Power
V
OUT
Accuracy (50% loads):
+5V Output
±2V or ±5V Outputs
Temperature Coefficient
Ripple/Noise (20MHz BW)
Line/Load Regulation
Efficiency
Isolation Voltage
Isolation Capacitance
Current Limiting
Short Circuit Protection at 25ºC
Overvoltage Protection
back
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in
the Performance/Functional Specifications Table is not implied.
Technical Notes
Dynamic Characteristics
Transient Response (50% load step)
Switching Frequency
300µsec max. to ±2% of final value
65kHz (±5kHz)
Environmental
Operating Temperature (ambient):
Without Derating
With Derating
Storage Temperature
–40 to +55°C
to +00°C (See Derating Curve)
–40 to +05°C
2" x 2" x 0.45" (5 x 5 x .4mm)
5-sided
Pin 2 (–V
IN
)
Pin (+V
IN
)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Copper alloy with gold plate over nickel
underplate
2.7 ounces (77 grams)
Physical
Dimensions
Shielding
Case Connections:
D2A Models
D48A Models
Case Material
Filtering and Noise Reduction
All A-Series TWR 20 Watt DC/DC Converters achieve their rated ripple and
noise specifications without the use of external input/output capacitors. In
critical applications, input/output noise may be further reduced by installing
electrolytic capacitors across the input terminals and/or low-ESR tantalum or
electrolytic capacitors across the output terminals. Output capacitors should
be connected between their respective output pin (pin 5, 6 or 8) and Common
(pin 7). The caps should be located as close to the power converters as
possible. Typical values are listed below. In many applications, using values
greater than those listed will yield better results.
To Reduce Input Ripple
D2A Models
20µF, 50V
D48A Models
0µF, 00V
To Reduce Output Ripple
+5V Output
47µF, 0V, Low ESR
±2/5V Outputs
33µF, 20V, Low ESR
In critical, space-sensitive applications, C&D may be able to tailor the internal
input/output filtering of these units to meet your specific requirements. Con-
tact our Applications Engineering Group for additional details.
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For C&D A-Series TWR
20 Watt DC/DC Converters, you should use slow-blow type fuses with values
no greater than 4A for "D2A" models and 2A for "D48A" models.
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A TTL
logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the converter.
A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection, enables the
converter. Control voltages should be referenced to pin 2 (–Input). Applying a
voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
Pin Material
Weight
These converters require 0% min. loading on their primary output and 20% min.
loading on their auxiliary outputs to maintain specified regulation. Operation under no-load
conditions will not damage the devices; however they may not meet all listed specifications. For
testing and specification purposes, "full load" is defined as 2.75A on the primary +5V output and
±250/200mA on the auxiliary ±2/5V outputs. This corresponds to a total output power of 9.75W.
Application-specific internal input/output filtering can be recommended or perhaps added
internally upon request. Contact C&D Applications Engineering for details.
Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
D48A models have BASIC, D2A models have Functional insulation.Devices can be screened
or modified for higher guaranteed isolation voltages. Contact C&D Applications Engineering
for details.
To avoid damage to the surface finish, please do not use certain cleaning agents such as Vigon.
Contact C&D Technologies for information.
DC/DC CONVERTERS
MDC_TWR20W.A03
Page 3 of 8
www.cd4power.com
POWER ELECTRONICS DIVISION
TWR A-Series
20W, Triple Output DC/DC Converters
Typical Performance Curves (T
A
= +25°C)
The performance curves below were derived from actual test data for a single model number (TWR-5/3000-2/250-D48).
Since all devices in this series have the same circuit architecture, the performance curves are representative for all devices.
Efficiency vs. Input Voltage
(+5V output loaded @ 2.75A, ±12V outputs loaded @ ±250mA)
84.0
83.5
83.0
88
86
84
Efficiency vs. +5V Output Loading
(±12V outputs loaded @ ±250mA)
V
IN
= 18V
Efficiency (%)
Efficiency (%)
82.5
82.0
81.5
81.0
80.5
80.0
18
24
36
48
60
72
82
80
78
76
74
72
0.25
0.75
1.25
1.75
2.25
2.75
V
IN
= 72V
V
IN
= 48V
Input Voltage (V)
+5V Output Current (A)
Efficiency vs. ±12V Output Loading
(+5V output loaded @ 0.55A)
89
86
83
V
IN
= 48V
V
IN
= 18V
84
83
82
Efficiency vs. ±12V Output Loading
(+5V output loaded @ 2.75A)
V
IN
= 18V
Efficiency (%)
77
74
71
68
65
25
50
100
150
V
IN
= 72V
Efficiency (%)
80
81
80
79
78
77
V
IN
= 48V
V
IN
= 72V
200
250
76
25
50
100
150
200
250
±12V Output Currents (±mA)
±12V Output Currents (±mA)
DC/DC CONVERTERS
www.cd4power.com
MDC_TWR20W.A03
Page 4 of 8
POWER ELECTRONICS DIVISION
TWR A-Series
20W, Triple Output DC/DC Converters
+5V Output Load Regulation
(±12V outputs loaded @ ±250mA)
+5.02
V
IN
= 18V
+5.01
V
IN
= 48V
+5.00
+5.00
+4.99
+4.98
+5V Output Load Regulation
(±12V outputs loaded @ ±25mA)
V
IN
= 18 V
V
IN
= 48 V
+5V Output Voltage (V)
+4.97
+4.96
V
IN
= 72V
+4.95
+4.94
+4.93
+4.92
0.25
0.75
1.25
1.75
2.25
2.75
+5V Output Voltage (V)
+4.99
+4.98
+4.97
V
IN
= 72 V
+4.96
+4.95
+4.94
0.25
0.75
1.25
1.75
2.25
2.75
+5V Output Current (A)
+5V Output Current (A)
+12.35
+12.25
+12V Output Load Regulation
(+5V output loaded @ 0.55A)
+13.20
+13.05
V
IN
= 72 V
+12V Output Load Regulation
(+5V outputs loaded @ 2.75A)
V
IN
= 48 V
+12V Output Voltage (V)
+12V Output Voltage (V)
+12.15
+12.05
+11.95
+11.85
+11.75
V
IN
= 18 V
+11.65
+11.55
25
50
100
150
+12.90
V
IN
= 72 V
+12.75
+12.60
+12.45
+12.30
+12.15
V
IN
= 18 V
25
50
100
V
IN
= 48 V
150
200
250
200
250
+12.00
±12V Output Currents (±mA)
±12V Output Currents (±mA)
–11.60
–11.70
–11.80
-12V Output Load Regulation
(+5V output loaded @ 0.55A)
–12.00
–12.15
-12V Output Load Regulation
(+5V output loaded @ 2.75A)
V
IN
= 18 V
V
IN
= 48 V
V
IN
= 18 V
-12V Output Voltage (V)
–11.90
–12.00
–12.10
–12.20
–12.30
–12.40
25
50
V
IN
= 72 V
V
IN
= 48 V
-12V Output Voltage (V)
–12.30
–12.45
V
IN
= 72 V
–12.60
–12.75
–12.90
–13.05
100
150
200
250
–13.20
25
50
100
150
200
250
±12V Output Currents (±mA)
±12V Output Currents (±mA)
DC/DC CONVERTERS
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MDC_TWR20W.A03
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