Among the three families of triple-output DC/DC converters in MPS’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.
PRODUCT OVERVIEW
Each unit’s primary +5V output can source any cur-
rent up to 3 Amps (primary power = 15W); while its
auxiliary ±12/15V outputs can source currents up to
±500mA (auxiliary power = 12/15W). 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 MPS’s new A-Series, the 20W triples
exhibit both low cost and outstanding long-term
reliability. Their design combines straightforward
circuit topologies, the newest components, proven
SMT-on-pcb construction methods, and highly repeat-
able automatic-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
±12V or ±15V auxiliary outputs. “D12A” models
achieve fully rated performance with inputs ranging
from 9 to 36 Volts. “D48A” models operate over an
input range of 18-75 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.
FEATURES
cost! Highly reliable!
Low
20 Watts output power
Full
Power “user-allocated” among outputs
Proven SMT-on-pcb construction
tested; HALT tested; EMC tested
Qual
Output voltages: +5V/±12V or +5V/±15V
Ultra-wide input voltage ranges: 9-36V or 18-75V
Designed to meet UL1950/EN60950.
BASIC insulation (all 48VIN models)
mark available (75V input models)
CE
Small packages, 2" x 2" x 0.45"
isolated, 1500Vdc guaranteed
Fully
Guaranteed efficiencies to 82%
to +100°C operating temperature
–40
cations and customs for OEM’s
Modifi
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.murata-ps.com/rohs
www.murata-ps.com/support
MDC_TWR20W.E02
Page 1 of 8
TWR A-Series
20W, Triple Output DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
R/N (mVp-p)
Regulation
V
OUT
I
OUT
Model Family
(V)
(mA)
Typ.
Max.
Line
Load
TWR-5/3000-12/500-D12A-C
TWR-5/3000-12/500-D48A-C
TWR-5/3000-15/500-D12A-C
TWR-5/3000-15/500-D48A-C
+5
±12
+5
±12
+5
±15
+5
±15
3000
±500
3000
±500
3000
±500
3000
±500
50
75
50
75
50
75
50
75
100
125
100
125
100
150
100
150
±0.2%
±0.5%
±1%
±1%
±0.1%
±0.5%
±1%
±1%
±0.5%
±6%
±2%
±5%
±0.25%
±4%
±2%
±5%
Input
V
IN
Nom.
(Volts)
12
48
12
48
Range
(Volts)
9-36
18-75
9-36
18-75
I
IN
(mA)
20/1004
40/559
40/1173
40/559
Efficiency
Min.
81%
82%
81%
81%
Typ.
82%
83%
82%
82%
Package
(Case/
Pinout)
C4, P13
C4, P13
C4, P13
C4, P13
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless otherwise noted.
For the +5V output, listed spec applies over the 10% to 100% load range. For the ±12/15V outputs,
For testing and specification purposes, “full load” is defined as 2.75A on the primary +5V output and listed spec applies for balanced loads over the 20% to 100% load range.
±250/200mA on the auxiliary ±12/15V outputs. This corresponds to a total output power of 19.75W.
Nominal line voltage, no-load/full-load conditions.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
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 (12V nominal)
Voltage (+5V)
D48
= 18-75V (48V nominal)
Maximum Auxilliary Output:
Maximum Primary Output
Current in mA
Currents in mA from each output
Nominal Auxiliary Output:
* Contact Murata
Voltages (±12 or ±15V)
Power Solutions 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)
6
1
2
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
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
1
2
3
4
5
6
7
8
Function P13
+Input
-Input
No Pin
On/Off Control
+12V/15V Output
+5V Output
Common
-12V/15V Output
Note:
For “D12A” models, the case
is connected to pin 2 (–V
IN
).
For “D48A” models, the case is
connected to pin 1 (+V
IN
).
Dimensions are in inches (mm)
Ambient Temperature (°C)
www.murata-ps.com/support
MDC_TWR20W.E02
Page 2 of 8
TWR A-Series
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and “full-load” conditions, unless noted.
20W, Triple Output DC-DC Converters
Absolute Maximum Ratings
Input
Input Voltage Range:
D12A Models
D48A Models
Input Current
Input Filter Type
Overvoltage Shutdown:
D12A Models
D48A Models
Reverse-Polarity Protection
On/Off (Sync.) Control (Pin 4)
9-36 Volts (24V nominal)
18-75 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
±1%
±3%
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1500Vdc, minimum
500pF
Power down to restart
5 min. max, 5V output
30 sec max.12/15V outputs
Zener/transorb clamps, magnetic feed-
Input Voltage:
“D12” Models
“D48” Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
+5V Output
±12V Outputs
±15V Outputs
Output Current
Storage Temperature
Lead Temperature (soldering, 10 sec.)
44 Volts
88 Volts
Current must be <6A. Brief
duration only. Fusing recommended.
6.8 Volts, limited duration
±15 Volts, limited duration
±18 Volts, limited duration
Current limited.
Max. currents are
model dependent.
–40 to +105°C
+300°C
Output
Total Output Power
V
OUT
Accuracy (50% loads):
+5V Output
±12V or ±15V 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
165kHz (±15kHz)
Environmental
Operating Temperature (ambient):
Without Derating
With Derating
Storage Temperature
–40 to +55°C
to +100°C (See Derating Curve)
–40 to +105°C
2" x 2" x 0.45" (51 x 51 x 11.4mm)
5-sided
Pin 2 (–V
IN
)
Pin 1 (+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:
D12A 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
D12A Models
20μF, 50V
D48A Models
10μF, 100V
To Reduce Output Ripple
+5V Output
47μF, 10V, Low ESR
±12/15V Outputs
33μF, 20V, Low ESR
In critical, space-sensitive applications, MPS 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 MPS A-Series TWR
20 Watt DC/DC Converters, you should use slow-blow type fuses with values
no greater than 4A for “D12A” 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 10% 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 ±12/15V outputs. This corresponds to a total output power of 19.75W.
Application-specific internal input/output filtering can be recommended or perhaps added
internally upon request. Contact MPS 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, D12A models have Functional insulation.Devices can be screened
or modified for higher guaranteed isolation voltages. Contact MPS Applications Engineering
for details.
To avoid damage to the surface finish, please do not use certain cleaning agents such as Vigon.
Contact Murata Power Solutions for information.
www.murata-ps.com/support
MDC_TWR20W.E02
Page 3 of 8
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-5/3000-12/250-D48).
Since all devices in this series have the same circuit architecture, the performance curves are representative for all devices.
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