www.murata-ps.com
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
OBSOLETE PRODUCT
Last time buy: 04 January 2013
Typical units
FEATURES
±12V/±15V and 3.3V/5V outputs
10-18V, 18-36V or 36-75V inputs
to 22.5 Watts total output power with over-
Up
temperature shutdown
87% efficiency; 80-100mV Ripple and Noise
To
x 2" x 0.5" encapsulated package
1"
1500Vdc isolation for both outputs
ed to UL 60950-1, CSA-C22.2 No. 60950-1,
Certifi
EN60950-1 safety approvals, 2nd Edition
Extensive self-protection with short circuit
shutdown
Output overvoltage and overcurrent protection
under and overvoltage shutdown
Input
for mixed analog/digital systems
Ideal
PRODUCT OVERVIEW
Packaged in 1" x 2" encapsulated modules, the TWR
22W series DC/DC converters offer three outputs
arranged as a unipolar low voltage supply and a
higher voltage bipolar output pair. The unipolar
section supplies either +3.3V at 4A maximum or
+5V at 3A maximum. The bipolar outputs are either
±12Vdc at 300mA maximum or ±15Vdc at 250mA
and are ideal for op amps, linear or analog circuits.
A single TWR converter can power applications
with combined analog and digital circuits such as a
CPU-controlled voice switch, embedded telephone
modem or analytical instruments.
The input section is fully isolated from the outputs
up to 1500Vdc minimum using Basic insulation.
Three wide input ranges are available including
10-18V (12Vdc nominal), 18-36V (24Vdc nomimal)
or 36-75V (48Vdc nominal). Peak-to-peak output
ripple/noise is typically 80-100mV at full load.
Efficiencies range up to 87%.
The TWR 22W series outputs will limit their current
if driven to overload and may be short circuited
indefinitely without damage. The inputs will shut
down if input voltage is either over or under limits
or has reversed input voltage. These converters
will operate at higher temperatures with adequate
airflow.
The unipolar output features line and load regula-
tion of ±1%. Excellent dynamic response assures
transient load change settling within 100 microsec-
onds. Other convenience features include a remote
On/Off control to turn the outputs on via digital
logic, CPU bit, control transistor or a relay.
Fabrication uses DATEL’s advanced surface
mount automated pick-and-place assembly and
computer-controlled parameter testing. All TWR
22W series are certified to safety requirements in
UL, EN60950-1 and CSA-C22.2 No.60950-1, 2nd
Edition.
Figure 1. Simplified block diagram
Typical topography is shown.
For full details go to
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MDC_TWR22.C03
Page 1 of 9
Triple Output/TWR Models
Performance Specifications and Ordering Guide
Output
Isolated, High Reliability 1" x 2" DC/DC Converters
Input
R/N (mvp-p)
Model
TWR-3.3/4-12/300-D12-C
TWR-3.3/4-12/300-D24-C
TWR-3.3/4-12/300-D48N-C
TWR-3.3/4-15/250-D12-C
TWR-3.3/4-15/250-D24-C
TWR-3.3/4-15/250-D48N-C
TWR-5/3-12/300-D12-C
TWR-5/3-12/300-D24-C
TWR-5/3-12/300-D48N-C
TWR-5/3-15/250-D12-C
TWR-5/3-15/250-D24-C
TWR-5/3-15/250-D48N-C
V
OUT
Volts
3.3
±12
3.3
±12
3.3
±12
3.3
±15
3.3
±15
3.3
±15
5
±12
5
±12
5
±12
5
±15
5
±15
5
±15
I
OUT
Amps
4
0.3
4
0.3
4
0.3
4
0.25
4
0.25
4
0.25
3
0.3
3
0.3
3
0.3
3
0.25
3
0.25
3
0.25
Typ.
40
70
Max.
60
150
Regulation (Max.)
Line
±0.05%
±0.35%
Load
±0.4%
±3%
V
IN
Nom.
(Volts)
12
Range
(Volts)
9-18
Input Current
No Load
(mA)
170
Full Load
(Amps)
2.00
Efficiency
Min.
82%
Typ.
85%
Packag
(Case/
Pinout)
C39/P61
C39/P61
Please contact Murata Power Solutions for further information.
C39/P61
C39/P61
80
100
80
100
80
100
80
100
80
100
40
45
80
45
65
45
100
150
100
150
100
150
100
150
100
150
75
65
100
60
100
60
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±0.05%
±0.5%
±0.4%
±0.625%
±0.05%
±0.4%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±0.2%
±4%
±0.2%
±4%
±0.3%
±4%
24
48
12
24
48
12
24
48
18-36
36-75
9-18
18-36
36-75
9-18
18-36
36-75
25
25
120
90
25
170
80
45
1.00
0.50
2.20
1.08
0.53
2.26
1.09
0.54
83%
85%
81.5%
83%
85%
81%
83%
85%
86%
87%
84%
86%
87%
83%
86%
87.5%
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
T WR
-
5
/
3
-
12
/
300
Output Configuration
Wide Range Input
Nominal Primary Output Voltage
Maximum Primary Output Current
D48 N
-
C
RoHS-6 Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b, lead in solder)
On/Off Control Polarity
Input Voltage Range
See page 9 for complete Part Number Structure and Ordering Information
Maximum Auxiliary Output Current
Nominal Auxiliary Output Voltage
MECHANICAL SPECIFICATIONS
2.00
(50.8)
PLASTIC CASE
0.49
(12.5)
STANDOFF
0.020 (0.5)
0.20 MIN
(5.1)
0.040 ±0.002 DIA.
(1.016 ±0.051)
1.800
(45.72)
0.10
(2.5)
4
1
2
5
6
7
BOTTOM VIEW
0.200
(5.08)
I/O Connections
Pin
Function P61
1
+Input
2
–Input
3
On/Off Control
4
+12V/15V Output
5
–12V/15V Output
6
Common
7
+3.3/5V Output
Alternate pin length and/or other output
voltages are available under special
quantity order.
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
0.300
(7.62)
0.800
0.600
(20.32)
(15.24)
1.00
(25.4)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
3
0.10
(2.5)
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MDC_TWR22.C03
Page 2 of 9
Triple Output/TWR Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, nominal output voltage, natural air convection,
external caps and full-load conditions unless noted.
Input
Isolated, High Reliability 1" x 2" DC/DC Converters
Short Circuit Duration (no damage)
Overvoltage Protection:
3.3V Output
5V Output
±12V or ±15V Outputs
Continuous, output shorted to ground
3.3V=3.8Vdc minimum, 4.2Vdc maximum
5V= 6.2Vdc minimum, 7.7Vdc maximum
30Vdc maximum
Method: magnetic feedback
Dynamic Characteristics
Input Voltage Range
Start-Up Threshold:
12V Models
24V Models
48V Models
Undervoltage Shutdown:
12V Models
24V Models
48V Models
Overvoltage Shutdown:
12V Models
24V Models
48V Models
Reflected (Back) Ripple Current
Input Current:
Full Load Conditions
No Load V
IN
= nominal
12V and 24V Models
48V Models
Low-Line Voltage (V
IN
= V
MIN
, full load)
Remote On/Off Control
Positive Logic (no model suffix)
Current
Negative Logic (N model suffix)
Current
See Ordering Guide
9V minimum, 9.5V typical
16.5V minimum, 17V typical
34V minimum, 35V typical
8V minimum, 8.5V typical
15.5V minimum, 16.3V typical
32.5V minimum, 34.5V typical
20V typical, 21V maximum
37V typical, 38V maximum
78.5V typical, 81V maximum
12mA typical, 20mAp-p maximum
Dynamic Load Response (50-100% loadstep)
3.3V or 5V Output
150μsec to ±1.5% of final value
±12V or ±15V Outputs
150μsec to ±10% of final value
Start-Up Time
VIN to VOUT regulated
Switching Frequency
TBD msec for VOUT = nominal
330kHz ±20kHz
Environmental
Calculated MTBF
See Ordering Guide
25mA typical, 50mA maximum
170mA typical, 200mA maximum
TBD
Off = ground pin to +1.2V maximum
On = open pin to +V
IN
maximum
2mA maximum
On = ground pin to +1.2V maximum
Off = open pin to +V
IN
maximum
18mA maximum
Output
TBD
–40 to +65°C
See Derating Curves
–40 to +100°C maximum
–40 to +120°C
+110°C minimum to 120°C maximum
10% to 90%, non-condensing
Physical
Operating Temperature: (Ambient)
No Derating (Natural convection)
With Derating
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Relative Humidity
Dimensions
Case and Header Material
Pin Dimensions/Material
Weight
See Mechanical Specifications
Black Diallyl Phthalate plastic
0.04" (1.016mm) dia. Gold-plated copper
alloy with nickel underplate.
TBD
TBD
Certified to UL/cUL 60950-1 CSA-C22.2
No.234 IEC/EN 60950-1, 2nd Edition
VOUT Range
VOUT Accuracy:
3.3V or 5V Output
±12V or ±15V Outputs
Temperature Coefficient
Minimum Loading:
3.3V or 5V Output
±12V or ±15V Outputs
Ripple/Noise (20MHz BW)
Line/Load Regulation
Efficiency
Maximum Capacitive Loading:
3.3V or 5V Output
±12V or ±15V Outputs
Isolation:
Input to Output Voltage
Resistance
Capacitance
Isolation Safety Rating
Current Limit Inception: (98% of VOUT)
3.3V Output
5V Output
±12V Outputs
±15V Outputs
Short-Circuit Detection:
3.3V or 5V Output
±12V or ±15V Outputs
Short-Circuit Potection Method
Short-Circuit Current:
3.3V or 5V Output
±12V or ±15V Outputs
See Ordering Guide
±1% of VNOM
±10% of VNOM (See Technical Notes)
±0.02% of VOUT range/°C
See Technical Notes
No minimum load
20% minimum of nominal output current,
balanced load
See Ordering Guide
See Ordering Guide & Technical Notes
See Ordering Guide
TBD
TBD
1500Vdc minimum
100MΩ
470pF
Functional insulation
5 Amps minimum, 6.2 Amps maximum
4 Amps minimum, 5.3 Amps maximum
0.36 Amps minimum, 1 Amp maximum
0.36 Amps minimum, 0.9 Amps maximum
Magnetic feedback
Magnetic feedback plus voltage clamp
Current limiting with hiccup autorestore.
Remove overload for recovery.
2 Amps maximum
1 Amp maximum
Electromagnetic Interference
Safety
All models are tested/specified with two external 0.047µF output capacitors. These capacitors
are necessary to accommodate our test equipment and may not be required to achieve speci-
fied performance in your applications. All models are stable and regulate within spec under
no-load conditions.
Input Reflected Ripple Current is tested/specified over a 20MHz bandwidth. Input filtering is
C
IN
= 33µF, 100V tantalum; C
BUS
= 220µF, 100V electrolytic; L
BUS
= 12µH. See Technical Notes.
For consistent operation, the instantaneous input voltage for full output load must not go below
the low shutdown voltage
AT ALL TIMES.
Beware of excessive voltage drop from long input
wiring. For reliable startup, be sure to apply input power promptly and fully as a step function.
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case
3, ground fixed conditions, T
CASE
= +25°C, full load, natural air convection.
The On/Off Control may be driven with external logic or the application of appropriate voltages
(referenced to Common). The On/Off Control input should use either an open collector/open drain
transistor or logic gate which does not exceed +V
IN
. The On/Off Control may be supplied with with
negative logic (LO = on, HI = off) using the "N" model suffix.
Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if
the total RMS current over time does not exceed the derating curve.
All models are fully operational and meet published specifications, including cold start at –40°C.
Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise
Reduction.
The outputs share a common isolated return. The two output sections are not isolated from
each other.
Regulation specifications describe the deviation as the line input voltage or output load current
is varied from a nominal midpoint value to either extreme.
The outputs will not accept appreciable reverse current without possible damage.
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MDC_TWR22.C03
Page 3 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Absolute Maximum Ratings
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the instantaneous input
voltage drops below the Undervoltage Shutdown limit. Subsequent restart
will not occur until the input is brought back up to the Start-Up Threshold.
This built-in hysteresis avoids any unstable on/off situations occurring at a
single input voltage. However, you should be aware that poorly regulated
input sources and/or higher input impedance sources (including long power
leads) which have outputs near these voltages may cause cycling of the
converter outputs.
Ripple Current and Output Noise
All TWR converters are tested and specified for input reflected ripple cur-
rent (also called Back Ripple Current) and output noise using specified filter
components and test circuit layout as shown in the figures below. Input
capacitors must be selected for low ESR, high AC current-carrying capabil-
ity at the converter’s switching frequency and adequate bulk capacitance.
The switching nature of DC/DC converters requires this low AC impedance
to absorb the current pulses reflected back from the converter’s input.
Input Voltage:
Continuous or transient
12V Models
24V Models
48V Models
On/Off Control
(Pin 1)
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
–0.3V minimum or +18V maximum
–0.3V minimum or +36V maximum
–0.3V minimum or +75V maximum
–0.3V minimum or +V
IN
maximum
None. Install external fuse.
V
OUT
+20% maximum
Current limited. Devices can
withstand sustained output short
circuits without damage.
–40 to +120°C
+280°C
Storage Temperature
Lead Temperature
(soldering 10 sec. max.)
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.
T E C H N I C A L
N O T E S
Load Dependency and Regulation
The high voltage bipolar output section derives its regulation as a slave
to the low voltage unipolar output. Be aware that large load changes on
the unipolar section will change the voltage somewhat on the bipolar
section. To retain proper regulation, the bipolar voltage section must have
a minimum load of at least 10% of rated full output. With this minimal
load (or greater), the high voltage bipolar section will meet all its regula-
tion specifications. If there is no load, the output voltage may exceed the
regulation somewhat.
Input Fusing
Certain applications and/or safety agencies require fuses at the inputs
of power conversion components. Fuses should also be used if there is the
possibility of sustained, non-current limited reverse input polarity. DATEL
recommends fast-blow type fuses approximately twice the maximum input
current at nominal input voltage but no greater than 5 Amps. Install these
fuses in the high side (ungrounded input) power lead to the converter.
Input Voltage
12 Volts
24 Volts
48 Volts
Input Source Impedance
The external source supplying input power must have low AC imped-
ance. Failure to insure adequate low AC impedance may cause stability
problems, increased output noise, oscillation, poor settling and aborted
start-up. The converter’s built-in front end filtering will be sufficient in most
applications. However, if additional AC impedance reduction is needed,
consider adding an external capacitor across the input terminals mounted
close to the converter. The capacitor should have low internal Equivalent
Series Resistance (ESR) and low inductance. Often, two or more capaci-
tors are used in parallel. A ceramic capacitor gives very low AC impedance
while a parallel electrolytic capacitor offers improved energy storage.
Fuse Value
4 Amps
2 Amps
1 Amp
Figure 2. Measuring Input Ripple Current
Output Overcurrent Detection
Overloading the power converter’s output for extended periods (but not a
short circuit) at high ambient temperatures may overheat the output com-
ponents and possibly lead to component failure. Brief moderate overcurrent
operation (such as charging up reasonably-sized external bypass capacitors
when first starting) will not cause problems. The TWR series include current
limiting to avoid heat damage. However, you should remove a sustained
overcurrent condition promptly as soon as it is detected. Combinations of
low airflow and/or high ambient temperature for extended periods may
cause overheating even though current limiting is in place.
Current Return Paths
Make sure to use adequately sized conductors between the output
load and the Common connection. Avoid simply connecting high current
returns only through the ground plane unless there is adequate copper
thickness. Also, route the input and output circuits directly to the Common
pins. Failure to observe proper wiring may cause instability, poor regulation,
increased noise, aborted start-up or other undefined operation.
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MDC_TWR22.C03
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Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Safety Considerations
The TWR’s must be installed with consideration for any local safety,
certification or regulatory requirements. These vary widely but generally
are concerned with properly sized conductors, adequate clearance between
higher voltage circuits, life testing, thermal stress analysis of components and
flammability of components.
Remote On/Off Control
The TWR models include an input pin which can turn on or shut off the
converter by remote signal. For positive logic models (no model number
suffix), if this pin is left open, the converter will always be enabled as long
as proper input power is present. On/Off signal currents are referred to the
Input Common pin on the converter. There is a short time delay of several mil-
liseconds (see the specifications) for turn on, assuming there is no significant
external output capacitance.
The On/Off Control may also be supplied with negative logic (LO = on, HI =
off) using the “N” model number suffix. For negative logic, the On/Off pin must
be grounded or pulled LOW to turn on the unit. Positive logic models must
have this control pin pulled down for shutoff. Negative logic models must pull
up this control pin for shutoff.
Dynamic control of this On/Off input is best done with either a mechani-
cal relay, solid state relay (SSR), an open collector or open drain transistor,
CPU bit or a logic gate. The pull down current is 18mA max. for "N" models.
Observe the voltage limits listed in the specifications for proper operation.
Suggested circuits are shown below.
+INPUT
CMOS
LOGIC
ON/OFF
CONTROL
SIGNAL
GROUND
Isolation Considerations
These converters use both transformer and optical coupling to isolate the
inputs from the outputs. Ideal “floating” isolation implies ZERO CURRENT flow-
ing between the two Common return sections of the input and output up to the
working isolation voltage limit. Real-world isolation on this converter includes
both an AC current path (through some small coupling capacitance) and some
DC leakage current between the two ground systems. To avoid difficulties
in your application, be sure that there are not wideband, high amplitude AC
difference voltages between the two ground systems. In addition, ground dif-
ference voltages applied by your external circuits which exceed the isolation
voltage, even momentarily, may damage the converter’s isolation barrier. This
can either destroy the converter or instantly render it non-isolated.
Current Limiting and Short Circuit Condition
As the output load increases above its maximum rated value, the converter
will enter current limiting mode. The output voltage will decrease and the
converter will essentially deliver constant power. This is commonly called
power limiting.
If the current continues to increase, the converter will enter short circuit
operation and the PWM controller will shut down. Following a time-out
period, the converter will automatically attempt to restart. If the short circuit
is detected again, the converter will shut down and the cycle will repeat. This
operation is called hiccup autorecovery. Please be aware that excessive exter-
nal output capacitance may interfere with the hiccup autorestart.
Output Filtering and Noise Reduction
All switching DC/DC converters produce wideband output noise which radi-
ates both through the wiring (conducted emission) and is broadcast into the
air (radiated emission). This output noise may be attenuated by adding a small
amount of capacitance in parallel with the output terminals. Please refer to the
maximum output capacitance in the Specifications.
CONTROLLER
HI = ON
LO = OFF
(for positive
On/Off)
COMMON
Figure 3. On/Off Control With An External CMOS Gate
The amount of capacitance to add depends on the placement of the cap
(near the converter versus near the load), the distance from the converter to
the load (and resulting series inductance), the topology and locations of load
elements if there are multiple parallel loads and the nature of the loads. For
switching loads such as CPU’s and logic, this last item recommends that small
bypass capacitors be placed directly at the load. Very high clock speeds sug-
gest smaller caps unless the instantaneous current changes are high. If the
load is a precision high-gain linear section, additional filtering and shielding
may be needed.
Many applications will need no additional capacitance. However, if more
capacitance is indicated, observe these factors:
1. Understand the noise-reduction objective. Are you improving the switching
threshold of digital logic to reduce errors? (This may need only a small
amount of extra capacitance). Or do you need very low noise for a precision
linear “front end”?
2. Use just enough capacitance to achieve your objective. Additional capaci-
tance trades off increasing instability (actually adding noise rather than
reducing it), poor settling response, possible ringing or outright oscilla-
tion by the converter. Excessive capacitance may also disable the hiccup
autorestart. Do not exceed the maximum output capacitance specification.
Figure 4. On/Off Control With An External Transistor (positive logic)
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