This family of triple output DC/DC converters was developed for
xDSL line card applications. Two independently regulated converters
in a 2" x 2" x 0.5" plastic package offer 3.3V @ 4.25A and ± 12V @
±625mA or ± 15V @ ±500mA.
PRODUCT OVERVIEW
Unlike topologies that provide auxiliary bipolar
secondary voltages, the TWR-3.3/4250-12/625 and
TWR-3.3/4250-15/500 have fully regulated bipolar
control loops that offer the same ±1% load regula-
tion seen on the 3.3V primary output.
Available with input ranges of 18 to 36V (-D24), or
36 to 75V (-D48), this TWR series offers 87% effi-
ciency, ±1% line regulation, input overvoltage and
undervoltage shutdown circuitry, output overvolt-
age and short circuit protection, as well as current
limiting protection and thermal shutdown.
SIMPLIFIED SCHEMATIC
TWR triple output converters will deliver full output
power in ambient, still air environments rang-
ing from –40 to +65°C. Designed using Basic
Insulation transformer construction, this family of
converters guarantees 1500Vdc of isolation voltage
and meets IEC950, UL1950 and EN60950 safety
standards. "D48" models are CE marked (meet LVD
requirements).
FEATURES
Independently regulated 3.3V and ±12V or
±15V outputs
@ 4.25A and ±12V @ ±625mA
3.3V
or ±15V @ ±500mA
Watts output power
30
efficiency; 75mV ripple/noise
87%
ranges: 18-36V or 36-75V
Input
x 2" plastic package
2"
Designed to meet UL 1950 and EN60950
safety approvals
isolated, 1500Vdc guaranteed
Fully
Insulation transformer construction
Basic
under and overvoltage shutdown
Input
Independent OVP; Short circuit protection
Thermal shutdown
Typical topology is shown
For full details go to
www.murata-ps.com/rohs
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MDC_TWR30.B05
Page 1 of 5
TWR Series
30W, Triple Output DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
R/N (mVp-p)
V
OUT
I
OUT
Model Family
(V)
(mA)
Typ.
Max.
TWR-3.3/4250-12/625-D24
TWR-3.3/4250-12/625-D48
TWR-3.3/4250-15/500-D24
TWR-3.3/4250-15/500-D48
3.3
±12
3.3
±12
3.3
±15
3.3
±15
4250
±625
4250
±625
4250
±500
4250
±500
75
100
75
100
75
100
75
100
125
150
125
150
125
150
125
150
Input
Regulation
Line
Load
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
V
IN
Nom.
(Volts)
24
48
24
48
Range
(Volts)
18-36
36-75
18-36
36-75
I
IN
(mA)
100/1420
50/700
100/1420
50/700
Efficiency
Min.
83%
84%
84%
84%
Typ.
85%
86%
85%
86%
Package
(Case/
Pinout)
C22/P31
C22/P31
C22/P31
C22/P31
Typical at T
A
= +25°C under nominal line voltage and maximum ouput currents.
Any combination of +3.3V and ±12V/±15V rated output current, not to exceed the
published I
OUT
specification (30 Watts).
Ripple/Noise (R/N) measured over a 20MHz bandwidth, specified with 0.2μF ceramic output
capacitors.
Tested from 10% load to 100% load, other outputs at maximum load.
Nominal line voltage, no-load/full-load conditions.
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
T WR
-
3.3
/
4250
-
12
/
625
-
D48
-
C
Output
Configuration:
T
= Triple
Wide Range Input
Nominal Primary Output:
Voltage (+3.3V)
Maximum Primary Output
Current in mA
RoHS-6 hazardous
substance compliant*
Input Voltage Range:
D24
= 18-36V (24V nominal)
D48
= 36-75V (48V nominal)
Maximum Auxilliary Output:
Currents in mA from each output
* Contact Murata Power
Solutions Technologies for
availability.
Case C22
Nominal Auxiliary Output:
Voltages (±12 or ±15V)
TEMPERATURE DERATING
30
28
26
24
22
Output Power (Watts)
20
18
16
14
12
10
8
6
4
2
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
Ambient Temperature ( C)
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
Function P31
+Input
-Input
No Pin
On/Off Control
+12V/15V Output
+3.3V Output
Common
-12V/15V Output
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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MDC_TWR30.B05
Page 2 of 5
TWR Series
30W, Triple Output DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, full-load conditions, unless noted.
Input
Input Voltage Range:
D24 Models
D48 Models
Overvoltage Shutdown:
D24 Models
D48 Models
Start-Up Threshold:
D24 Models
D48 Models
Undervoltage Shutdown:
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance:
D24 Models
D48 Models
Internal Input Filter Type
Reverse-Polarity Protection:
D24 Models
D48 Models
On/Off Control
(Pin 4)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
37-40 Volts (38V nominal)
77-81 Volts (79V nominal)
16-18 Volts (17V nominal)
34-36 Volts (35V nominal)
16-17.5 Volts (16.5V nominal)
32-35.5 Volts (34.5V nominal)
See Ordering Guide
10mA
Output (continued)
Short Circuit Current:
3.3V Output
±12V/±15V Output
Overvoltage Protection:
3.3V Output
±12V Output
±15V Output
Maximum Capacitive Loading:
3.3V Models
5V Models
2.5 Amps average, continuous
2.0 Amps average, continuous
Magnetic feedback, transorb
4.2Vdc
30Vdc (±15V differential)
36Vdc (±18V differential)
1000μF
680μF
Dynamic Characteristics
Dynamic Load Response:
3.3V (50-100% step to 2%V
OUT
)
300μsec maximum
±12V/±15V (50-100% step to 2%V
OUT
) 300μsec maximum
Start-Up Time:
V
IN
to V
OUT
:
3.3V
±12V/±15V
On/Off to V
OUT
Switching Frequency
200mAp-p max., 140mAp-p (typ.)
200mAp-p max., 140mAp-p (typ.)
Pi (0.039μF - 2.2μH - 3.3μF)
1 minute duration, 4A maximum
1 minute duration, 2A maximum
On = open or 13V to +V
IN
,
I
IN
= 50μA @ 13V
Off = 0-0.8V, I
IN
= 1mA @ 0V
10msec
15msec
10msec
350kHz (±30kHz)
Environmental
MTBF:
D24 Models
D48 Models
Operating Temperature
(Ambient):
Without Derating:
D24 Models
D48 Models
With Derating
Case Temperature:
Maximum Operational
For Thermal Shutdown
Storage Temperature
TBC
TBC
Output
V
OUT
Accuracy:
3.3V Output
±12V/±15V Output
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Minimum Loading Per Specification:
+3.3V Output
±12V/±15V Output
Minimum Loading For Stability
Isolation Voltage:
Input-to-Output
Input-to-Case
Ouput-to-Case
Isolation Capacitance
Isolation Resistance
±1.5%
±2%
See Ordering Guide
See Ordering Guide
See Ordering Guide
10% of I
OUT
maximum
±30mA
No load
1500Vdc minimum
Plastic case
Plastic case
470pF
100M
–40 to +55°C
–40 to +55°C
To +100°C (See Derating Curves)
+100°C
+110°C minimum, +118°C maximum
–40 to +120°C
2" x 2" x 0.5" (50.8 x 50.8 x 12.7mm)
Diallyl phthalate, UL94V-0 rated
Gold plate over copper alloy
2.47 ounces (70g)
Basic
Physical
Dimensions
Case Material
Pin Material
Weight:
Primary to Secondary Insulation Level
Current Limit Inception:
3.3V @ 97%V
OUT
(±12/±15V @ I
OUT
max.) 5.8-7.5 Amps (model dependent)
±12V @ 97%V
OUT
(+3.3V @ I
OUT
max.)
0.825-1.35 Amps
±15V @ 97%V
OUT
(+3.3V @ I
OUT
max.)
0.625-1.15 Amps
Temperature Coefficient
±0.02% per °C
All models are specified with external 0.2µF ceramic output capacitors.
See Technical Notes/Graphs for details.
The On/Off control function can be replaced with a Sync function. See Part Number Suffixes
and Technical Notes for details.
Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter
can cause permanent damage.
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the input return pin (–Input).
Demonstrated MTBF available on request.
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
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MDC_TWR30.B05
Page 3 of 5
TWR Series
30W, Triple Output DC/DC Converters
Absolute Maximum Ratings
Input Voltage:
Continuous:
D24A Models
D48A Models
Transient (100msec): D24A Models
D48A Models
42 Volts
81 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
4 Amps
2 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, TWR 30W triples will not begin to regulate
until the ramping input voltage exceeds the Start-Up Threshold Voltage
(typically 17V for "D24" models and 35V for "D48" models). Once operating,
devices will not turn off until the input voltage drops below the Undervoltage
Shutdown/Lockout limit (typically 16.5V for "D24" models and 34.5V for "D48"
models). Subsequent re-start will not occur until the input is brought back
up to the Start-Up Threshold. This built-in hysteresis obviously avoids any
indeterminate on/off conditions at a single voltage.
Start-Up Time
For all models in the TWR 30W Series, V
IN
to V
OUT
Start-Up Time is the
interval between the time at which a rapidly ramping input voltage crosses
the turn-on threshold point and the fully loaded output voltages enter and
remain within their specified accuracy bands. Actual measured times will vary
with output capacitance and load.
The On/Off to V
OUT
Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the con-
verter. The specification defines the interval between the time at which the
converter is turned on and the fully loaded output voltages enter and remain
within their specified accuracy bands.
On/Off Control
The On/Off Control pin (pin 4) is provided for remote on/off operation.
TWR 30W Series converters are designed so that they are enabled when the
control pin is pulled high or left open (normal mode) and disabled when the
control pin is pulled low (to less than +0.8V relative to –Input, pin 2).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current (see
Performance/Functional Specifications) when activated..
Applying an external voltage to pin 4 when no input power is applied to the
converter can cause permanent damage to the converter. The on/off control
function, however, is designed such that the converter can be disabled (pin
4 pulled low) while input power is ramping up and then "released" once the
input has stabilized. The time duration between the point at which the con-
verter is released and its fully loaded output voltage settles to within specified
accuracy can be found in the Performance/Functional Specifications.
Input Reverse-Polarity Protection
D24A Models
D48A Models
Output Current
On/Off Control (Pins 3 & 4) Max. Voltages
Referenced to –Input (pin 2)
No Suffix
+V
IN
"S" Suffix
+5.7 Volts
Storage Temperature
Lead Temperature
–40 to +120°C
See soldering guidelines
These are stress ratings. Exposure of devices to greater than 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, nor recommended.
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All TWR 30W Series models achieve their rated ripple and noise specifica-
tions without the use of external input/output capacitors. In critical applica-
tions, input/output ripple/noise may be further reduced by installing additional
external I/O caps. Input capacitors, which function primarily as energy-
storage elements, should be selected for bulk capacitance, low ESR and
high rms-ripple-current ratings. Output capacitors, which function more as
true filter elements, should be selected for bulk capacitance, low ESR, and
appropriate frequency response. All caps should have appropriate voltage
ratings and be mounted as close to the converters as possible. Temperature
variations for all parameters should obviously be taken into consideration.
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL TWR 30W DC/DC Converters, you should use
slow-blow type fuses with values no greater than the following.
Model Number
TWR-3.3/4250-12/625-D24
TWR-3.3/4250-12/625-D48
TWR-3.3/4250-15/500-D24
TWR-3.3/4250-15/500-D48
Fuse Value
4 Amps
2 Amps
4 Amps
2 Amps
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MDC_TWR30.B05
Page 4 of 5
TWR Series
30W, Triple Output DC/DC Converters
Typical Performance Curves
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica-
tions may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production
environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105° C.
250° C.
6 seconds
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following
operating requirements
and the
Life and Safety Critical Application Sales Policy:
Refer to:
http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
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