TWR-5/3-12/300-D12-C [MURATA]
Isolated, High Reliability; 孤立的，高可靠性
| 型号： | TWR-5/3-12/300-D12-C |
| 厂家： | 
muRata |
| 描述： | Isolated, High Reliability |
| 文件： | 总9页 (文件大小：231K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Typical units
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
FEATURES
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 applica-
tions with combined analog and digital circuits such as a CPU-controlled voice switch, embed-
ded telephone modem or analytical instruments.
ꢀ
12V/ 15V and 3.3V/5V outputs
ꢀ 10-18V, 18-36V or 36-75V inputs
ꢀ Up to 22.5 Watts total output power with
overtemperature shutdown
The input section is fully isolated from the outputs up to 1500Vdc minimum using Basic insula-
tion. 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%.
ꢀ To 87% efficiency; 80-100mV Ripple and
Noise
ꢀ 1" x 2" x 0.5" encapsulated package
ꢀ 1500Vdc isolation for both outputs
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.
ꢀ Designed to meet UL 60950-1, CSA-C22.2
No. 60950-1, EN60950-1 safety approvals
ꢀ Extensive self-protection with short circuit
shutdown
The unipolar output features line and load regulation of 1%. Excellent dynamic response
assures transient load change settling within 100 microseconds. Other convenience features
include a remote On/Off control to turn the outputs on via digital logic, CPU bit, control transis-
tor or a relay.
ꢀ Output overvoltage and overcurrent
protection
ꢀ Input under and overvoltage shutdown
ꢀ Ideal for mixed analog/digital systems
Fabrication uses DATEL’s advanced surface mount automated pick-and-place assembly and
computer-controlled parameter testing. All TWR 22W series are designed to meet safety
requirements in UL, EN60950-1 and CSA-C22.2 No.60950-1.
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For full details go to
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Typical topography is shown.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 1 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Performance Specifications and Ordering Guide ꢁ
Output
Input
Input Current
R/N (mvp-p)
Regulation (Max.)
Efficiency
Packag
(Case/
Pinout)
VOUT
Volts
IOUT
Amps
VIN Nom.
(Volts)
Range
(Volts)
No Load Full Load
Model
Typ.
40
Max.
60
Line
Load
0.45
2.ꢀ5
(mA)
(Amps)
Min.
Typ.
8ꢀ5
3.3
12
3.3
12
3.3
12
3.3
1ꢀ
3.3
1ꢀ
3.3
1ꢀ
ꢀ
12
ꢀ
12
ꢀ
12
ꢀ
1ꢀ
ꢀ
4
0.3
4
0.3
4
0.3
4
0.2ꢀ
4
0.2ꢀ
4
0.2ꢀ
3
0.3
3
0.3
3
0.3
3
0.2ꢀ
3
0.2ꢀ
3
0.2ꢀ
0.0ꢀ5
0.3ꢀ5
TWR-3.3/4-12/300-D12-C
12
9-18
170
2.00
825
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
C39/P61
70
1ꢀ0
TWR-3.3/4-12/300-D24-C
TWR-3.3/4-12/300-D48N-C
TWR-3.3/4-1ꢀ/2ꢀ0-D12-C
TWR-3.3/4-1ꢀ/2ꢀ0-D24-C
TWR-3.3/4-1ꢀ/2ꢀ0-D48N-C
TWR-ꢀ/3-12/300-D12-C
TWR-ꢀ/3-12/300-D24-C
TWR-ꢀ/3-12/300-D48N-C
TWR-ꢀ/3-1ꢀ/2ꢀ0-D12-C
TWR-ꢀ/3-1ꢀ/2ꢀ0-D24-C
TWR-ꢀ/3-1ꢀ/2ꢀ0-D48N-C
Please contact Murata Power Solutions for further information.
80
100
80
100
80
100
80
100
80
100
1ꢀ0
100
1ꢀ0
100
1ꢀ0
100
1ꢀ0
100
1ꢀ0
7ꢀ
15
ꢀ5
15
ꢀ5
24
48
12
24
48
12
24
48
18-36
36-7ꢀ
9-18
2ꢀ
2ꢀ
1.00
0.ꢀ0
2.20
1.08
0.ꢀ3
2.26
1.09
0.ꢀ4
835
8ꢀ5
81.ꢀ5
835
8ꢀ5
815
835
8ꢀ5
865
875
845
865
875
835
865
15
15
ꢀ5
ꢀ5
15
15
120
90
ꢀ5
ꢀ5
15
15
18-36
36-7ꢀ
9-18
ꢀ5
ꢀ5
15
15
2ꢀ
100
40
ꢀ5
ꢀ5
0.0ꢀ5
0.ꢀ5
0.45
0.45
0.0ꢀ5
0.45
0.25
45
0.25
45
0.35
45
170
80
4ꢀ
6ꢀ
40
7ꢀ
18-36
36-7ꢀ
1ꢀ
ꢀ
1ꢀ
4ꢀ
6ꢀ
6ꢀ
4ꢀ
100
60
4ꢀ
87.ꢀ5 C39/P61
T WR - ꢀ / 3 - 12 / 300 D48 N - C
Output Configuration
Wide Range Input
RoHS-6 Hazardous Substance Compliance
On/Off Control Polarity
Input Voltage Range
See page 9 for complete Part Number Structure and Ordering Information
Nominal Primary Output Voltage
Maximum Primary Output Current
Maximum Auxiliary Output Current
Nominal Auxiliary Output Voltage
MECHANICAL SPECIFICATIONS
2.00
(50.8)
PLASTIC CASE
0.49
(12.5)
Dimensions are in inches (mm shown for ref. only).
I/O Connections
Function P61
Pin
1
STANDOFF
0.020 (0.5)
Third Angle Projection
+Input
0.040 0.002 DIA.
(1.016 0.051)
2
–Input
0.20 MIN
(5.1)
3
On/Off Control
+12V/15V Output
–12V/15V Output
Common
1.800
(45.72)
0.10
(2.5)
4
5
0.200
(5.08)
6
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 2ꢀ
4
5
7
+3.3/5V Output
1
2
1.00
0.800
Alternate pin length and/or other output
voltages are available under special
quantity order.
6
7
0.600
(15.24)
(25.4)
(20.32)
0.300
(7.62)
Components are shown for reference only.
3
BOTTOM VIEW
0.10
(2.5)
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MDC_TWR22.B02 Page 2 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection,
ꢁ
external caps and full-load conditions unless noted.
Short Circuit Duration (no damage)
Continuous, output shorted to ground
Input
Overvoltage Protection:
3.3V or 5V Output
Input Voltage Range
See Ordering Guide
3.8Vdc minimum, 4.2Vdc maximum
30Vdc maximum
Method: magnetic feedback
Start-Up Threshold: ꢃ
12V Models
24V Models
12V or 15V Outputs
9V minimum, 9.5V typical
16.5V minimum, 17V typical
34V minimum, 35V typical
48V Models
Dynamic Characteristics
Dynamic Load Response (50-100% loadstep)
3.3V or 5V Output
12V or 15V Outputs
Undervoltage Shutdown: ꢃ
12V Models
24V Models
8V minimum, 8.5V typical
16V minimum, 16.5V typical
32.5V minimum, 34.5V typical
150μsec to 1.5% of final value
150μsec to 10% of final value
48V Models
Start-Up Time
VIN to VOUT regulated
Overvoltage Shutdown:
12V Models
24V Models
TBD msec for VOUT = nominal
330kHz 20kHz
20V typical, 21V maximum
38V typical, 40V maximum
78.5V typical, 81V maximum
Switching Frequency
48V Models
Environmental
Reflected (Back) Ripple Current ꢂ
12mA typical, 20mAp-p maximum
Calculated MTBF
TBD
Input Current:
Operating Temperature: (Ambient) ꢇ
No Derating (Natural convection)
With Derating
Full Load Conditions
No Load VIN = nominal
12V and 24V Models
48V Models
See Ordering Guide
–40 to +65°C
See Derating Curves
25mA typical, 50mA maximum
170mA typical, 200mA maximum
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Density Altitude
–40 to +100°C maximum
–40 to +120°C
Low-Line Voltage (VIN = VMIN, full load) TBD
+110°C minimum to 120°C maximum
0 to 10,000 feet
Remote On/Off Control ꢅ
Positive Logic (no model suffix)
Off = ground pin to +1.2V maximum
On = open pin to +VIN maximum
2mA maximum
Relative Humidity
10% to 90%, non-condensing
Current
Negative Logic (N model suffix)
On = ground pin to +1.2V maximum
Off = open pin to +VIN maximum
18mA maximum
Physical
Dimensions
See Mechanical Specifications
Black Diallyl Phthalate plastic
Current
Case and Header Material
Pin Dimensions/Material
Output
0.04" (1.016mm) dia. Gold-plated copper
VOUT Range
See Ordering Guide
alloy with nickel underplate.
Weight
VOUT Accuracy:
3.3V or 5V Output
12V or 15V Outputs
1% of VNOM
10% of VNOM (See Technical Notes)
TBD
TBD
Electromagnetic Interference
Safety
Temperature Coefficient
0.02% of VOUT range/°C
UL/cUL 60950-1 CSA-C22.2 No.234
IEC/EN 60950-1
Minimum Loading:
3.3V or 5V Output
12V or 15V Outputs
See Technical Notes
No minimum load
20% minimum of nominal output current,
balanced load
ꢁ 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.
Ripple/Noise (20MHz BW) ꢁꢂꢄ
Line/Load Regulation ꢊ
Efficiency
See Ordering Guide
See Ordering Guide & Technical Notes
See Ordering Guide
ꢂ Input Reflected Ripple Current is tested/specified over a 20MHz bandwidth. Input filtering is
CIN = 33μF, 100V tantalum; CBUS = 220μF, 100V electrolytic; LBUS = 12μH. See Technical Notes.
Maximum Capacitive Loading:
3.3V or 5V Output
ꢃ 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.
TBD
TBD
12V or 15V Outputs
ꢄ Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case
3, ground fixed conditions, TCASE = +25°C, full load, natural air convection.
Isolation:
Input to Output Voltage
Resistance
Capacitance
Isolation Safety Rating
1500Vdc minimum
100M7
ꢅ 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 +VIN.The On/Off Control may be supplied with with
negative logic (LO = on, HI = off) using the "N" model suffix.
470pF
Functional insulation
Current Limit Inception: (98% of VOUT)
3.3V Output
5V Output
ꢆ 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.
5 Amps minimum, 6.2 Amps maximum
4 Amps minimum, 5.2 Amps maximum
0.36 Amps minimum, 1 Amp maximum
0.5 Amps minimum, 1.2 Amps maximum
12V Outputs
15V Outputs
ꢇ All models are fully operational and meet published specifications, including cold start at –40°C.
ꢈ Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise
Reduction.
Short-Circuit Detection:
3.3V or 5V Output
Magnetic feedback
Magnetic feedback plus voltage clamp
ꢉThe outputs share a common isolated return. The two output sections are not isolated from
each other.
12V or 15V Outputs
Short-Circuit Potection Method
Current limiting with hiccup autorestore.
Remove overload for recovery.
ꢊRegulation 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.
Short-Circuit Current:
3.3V or 5V Output
2 Amps maximum
1 Amp maximum
12V or 15V Outputs
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 3 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Input Undervoltage Shutdown and Start-Up Threshold
Absolute Maximum Ratings
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.
Input Voltage:
Continuous or transient
12V Models
24V Models
48V Models
–0.3V minimum or +18V maximum
–0.3V minimum or +36V maximum
–0.3V minimum or +75V maximum
On/Off Control (Pin 1)
–0.3V minimum or +VIN maximum
See Fuse section
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
VOUT +20% maximum
Current limited. Devices can
withstand sustained output short
circuits without damage.
Storage Temperature
–40 to +120°C
Ripple Current and Output Noise
Lead Temperature (soldering 10 sec. max.) +300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
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.
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
4/
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.
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Input Fusing
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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 slow-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.
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.
Input Voltage
12 Volts
Fuse Value
4 Amps
24 Volts
2 Amps
48 Volts
1 Amp
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.
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.B02 Page 4 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Safety Considerations
Isolation 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. Contact DATEL if you need further advice
on these topics.
These converters use both transformer and optical coupling to isolate
the inputs from the outputs. Ideal “floating” isolation implies ZERO CUR-
RENT flowing 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 difference 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.
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
milliseconds (see the specifications) for turn on, assuming there is no
significant external output capacitance.
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.
The On/Off Control may also be supplied with negative logic (LO = on, HI
= off) using the “N” model number suffix. Here again, leaving the pin open
on either model will enable the converter. Positive logic models must have
this control pin pulled down for shutoff. Negative logic models must pull up
this control pin for shutoff.
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 external output capacitance may interfere with the hiccup
autorestart.
Dynamic control of this On/Off input is best done with either a mechani-
cal relay (ground the pin to turn it off), solid state relay (SSR), an open
collector or open drain transistor, CPU bit or a logic gate. The pull down
current is 18mA max. Observe the voltage limits listed in the specifications
for proper operation. Suggested circuits are shown below.
Output Filtering and Noise Reduction
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All switching DC/DC converters produce wideband output noise which
radiates 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.
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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 recom-
mends that small bypass capacitors be placed directly at the load. Very
high clock speeds suggest smaller caps unless the instantaneous current
changes are high. If the load is a precision high-gain linear section, addi-
tional filtering and shielding may be needed.
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Figure 3. On/Off Control With An External CMOS Gate
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Many applications will need no additional capacitance. However, if more
capacitance is indicated, observe these factors:
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1. Understand the noise-reduction objective. Are you improving the switch-
ing 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”?
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2. Use just enough capacitance to achieve your objective. Additional
capacitance trades off increasing instability (actually adding noise rather
than reducing it), poor settling response, possible ringing or outright
oscillation by the converter. Excessive capacitance may also disable
the hiccup autorestart. Do not exceed the maximum output capacitance
specification.
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Figure 4. On/Off Control With An External Transistor
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MDC_TWR22.B02 Page 5 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
3. Any series inductance considerably complicates the added capacitance
therefore try to reduce the inductance seen at the converter’s output. You
may need to add BOTH a cap at the converter end and at the load (effec-
tively creating a Pi filter) for the express purpose of reducing the phase
angle which is seen by the converter’s output loop controller. This tends
to hide (decouple) the inductance from the controller. Make sure your
power conductors are adequate for the current and reduce the distance
to the load as much as possible. Very low noise applications may require
more than one series inductor plus parallel caps.
It is probably more important in your system that all heat is periodically
removed rather than having very high airflow. Consider having the total
enclosure completely recycled at least several times a minute. Failure to
remove the heat causes heat buildup inside your system and even a small
fan (relative to the heat load) is quite effective. A very rough guide for typi-
cal enclosures is one cubic foot per minute of exhausted airflow per 100
Watts of internal heat dissipation.
Efficiency Curves
4. Oscillation or instabilility can occur at several frequencies. For this
reason, you may need both a large electrolytic or tantalum cap (car-
rying most of the capacitance) and a small wideband parallel ceramic
cap (with low internal series inductance). Always remember that inside
real world capacitors are distributed trace inductance (ESL) and series
resistance (ESR). Make sure the input AC impedance is very low before
trying to improve the output.
These curves indicate the ratio of output power divided by input power
at various input voltages and output currents times 100%. All curves are
measured at +25°C ambient temperature and adequate airflow.
Typical Performance Curves for TWR Series
5. It is challenging to offer a complete set of simple equations in reason-
able closed form for the added output capacitance. Part of the difficulty is
accurately modeling your load environment. Therefore your best success
may be a combination of previous experience and empirical approxima-
tion.
472 ꢂꢂ7 3ERIES /UTPUT 0OWER VSꢃ !MBIENT 4EMPERATURE ꢄꢂꢅ#
ꢄꢄ
ꢄꢉ
ꢃꢎ
ꢃꢏ
ꢃꢐ
ꢃꢄ
ꢃꢉ
ꢎ
Maximum Current and Temperature Derating Curves
The curves shown below indicate the maximum average output current
available versus the ambient temperature and airflow. All curves are done
approximately at sea level and you should leave an additional margin for
higher altitude operation and possible fan failure. (Remember that fans are
less efficient at higher altitudes). These curves are an average – current
may be greater than these values for brief periods as long as the average
value is not exceeded.
ꢏ
ꢐ
The “natural convection” area of the curve is that portion where self-
heating causes a small induced convective airflow around the converter
without further mechanical forced airflow from a fan. Natural convection
assumes that the converter is mounted with some spacing to adjacent com-
ponents and there are no nearby high temperature parts. Note that such
self-heating will produce an airflow of typically 25 Linear Feet per Minute
(LFM) without a fan. Heat is removed both through the mounting pins and
the surface of the converter.
ꢄ
ꢉ
nꢐꢉ
ꢉ
ꢐꢉ
ꢐꢅ
ꢅꢉ
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!MBIENT 4EMPERATURE ꢀo#ꢁ
Many systems include fans however it is not always easy to measure
the airflow adjacent to the DC/DC converter. Simply using the cubic feet
per minute (CFM) rating of the fan is not always helpful since it must be
matched to the volume of the enclosure, the outside ambient temperature,
board spacing, the intake area and total internal power dissipation.
Most PWM controllers, including those on the TWR’s, will tolerate opera-
tion up to about +100 degrees Celsius. If in doubt, attach a thermal sensor
to the package near the output components and measure the surface
temperature after allowing a proper warm-up period. Remember that the
temperature inside the output transistors at full power will be higher than
the surface temperature therefore do not exceed operation past approxi-
mately +100 deg. C on the surface. As a rough indication, any circuit which
you cannot touch briefly with your finger warrants further investigation.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 6 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Typical Performance Curves for TWR Series
472ꢆꢇꢃꢇꢈꢉꢆꢊꢂꢈꢇꢋꢋꢆ$ꢊꢂ
472ꢆꢇꢃꢇꢈꢉꢆꢊꢅꢈꢂꢅꢋꢆ$ꢊꢂ
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%FFICIENCY VSꢃ ,INE 6OLTAGE AND ,OAD #URRENT ꢂꢅ#
,OAD #URRENT ꢀ!MPSꢁ
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%FFICIENCY VSꢃ ,INE 6OLTAGE AND ,OAD #URRENT ꢂꢅ#
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www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 7 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Typical Performance Curves for TWR Series
472ꢆꢅꢈꢇꢆꢊꢅꢈꢂꢅꢋꢆ$ꢊꢂ
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www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 8 of 9
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
P A R T N U M B E R S T R U C T U R E
T WR - ꢀ / 3 - 12 / 300 - D48 N - C
Output Configuration:
T = Triple
RoHS-6 Hazardous
Substance Compliance
On/Off Control Polarity
Blank = Positive Logic
N = Negative Logic
Note: Some model number
combinations may not be
available. Contact Murata
Power Solutions.
Wide Range Input
Nominal Primary Output
Voltage (+3.3 or +5 Volts)
Input Voltage Range:
D12 = 10-18 Volts (12V nominal)
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Maximum Primary Output
Current in Amps
Maximum Auxiliary Output
Currents in mA from each output
Nominal Auxiliary Output
Voltages ( 12 or 15 Volts)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED
06/12/08
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
France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 9 of 9
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