UWE-12/20-Q12PC [MURATA]
DC-DC Regulated Power Supply Module, ROHS COMPLIANT PACKAGE-8;型号: | UWE-12/20-Q12PC |
厂家: | muRata |
描述: | DC-DC Regulated Power Supply Module, ROHS COMPLIANT PACKAGE-8 |
文件: | 总12页 (文件大小:1712K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
The UWE Series "Eighth-Brick" DC/DC Converters are high-current isolated
power modules designed for use in high-density system boards.
PRODUCT OVERVIEW
With dimensions of only 0.9 by 2.3 by 0.36
inches, the UWE series open frame DC/DC convert-
ers deliver up to 75 Watts in an industry-standard
“eighth-brick” through-hole package. This format
can plug directly into quarter-brick pinouts. Several
standard fixed-output voltages from 3.3 Vdc to 24
Vdc assure compatibility in embedded equipment,
tight line/load regulation, stable no-load operation
and fast load step response. All units are precision
assembled in a highly automated facility with ISO-
traceable manufacturing quality standards.
Isolation of 1500 Volts assures safety and fully
differential (floating) operation for greatest applica-
tion flexibility. On-board Sense inputs compensate
Typical unit
FEATURES
nꢀ
Industry-standard through-hole eighth-brick
package with 0.9" x 2.3" x 0.36" outline
dimensions
CPU cards and instrument subsystems. The extend- for line drop errors at high output currents. Outputs
ed 4-to-1 input power range (9-36V) is ideal for
battery-powered, telecom or portable applications.
Very high efficiency means no fans or temperature
deratings in many applications. An optional thermal
mounting baseplate extends operation into most
conceivable environments.
are trimmable within 10ꢀ of nominal voltage. The
UWE series are functionally complete.
nꢀ
Choice of two wide input ranges, 9 - 36 Vdc or
18-75 Vdc
A wealth of protection features prevents damage
to both the converter and outside circuits. Inputs
are protected from undervoltage and outputs fea-
ture short circuit protection, overcurrent and excess
temperature shut down. Overloads automatically
recover using the “hiccup” technique upon fault
removal. The UWE is designed to meet all standard
safety and EMI/RFI certifications. All units meet
RoHS-6 (no lead) hazardous materials compliance.
nꢀ
Fixed output from 3.3 to 24 Volts DC up to
75 Watts
The synchronous rectifier design uses the
nꢀ
Synchronous rectification yields very high
efficiency and low power dissipation
maximum available duty cycle for greatest ef-
ficiency and low power dissipation with no reverse
output conduction. Other features include low
on-resistance FET’s, planar magnetics and heavy-
copper PC boards. These deliver low output noise,
nꢀ
Operating temperature range from -40 to
+85˚C. with derating
nꢀ
Up to 1500 Volt DC isolation (basic insulation)
nꢀ
Outstanding thermal performance and
derating
nꢀ
Extensive self-protection, overtemperature and
overload features with no output reverse
conduction
+VOUT
+VIN
SWITCH
DRIVE
nꢀ
On/Off control, trim and remote sense functions
VOLTAGE
REGULATOR
nꢀ
Designed to meet UL/EN/IEC 60950-1, CAN/
CSA-C22.2 No. 60950-1 safety approvals
and FCC RFI/EMI certification
+SENSE
nꢀ
−VOUT
Pre-bias operation for startup protection
SS
PWM
–VIN
−SENSE
ON/OFF
CONTROL
REFERENCE
AMPLIFIER,
TRIM AND FEEDBACK
ISOLATION
TRIM
UV, OT
Typical topology is shown.
Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
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MDC_UWE Series.A11 Page 1 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
SPECIFICATION SUMMARY AND ORDERING GUIDE
Output
Input
Iin, no
Efficiency
Iin, full
load
(A)
R/N (mVp-p) ➂
Regulation (max.)
Vo u t
(V)
Io u t
(A)
Power
(W)
Vin Nom. Range
load
Package
(Case, Pinout)
Root Model
UWE-3.3/20-Q12P-C
UWE-3.3/20-Q48N-C
UWE-5/15-Q12P-C
UWE-5/15-Q48N-C
UWE-12/6-Q12P-C
UWE-12/6-Q48N-C
UWE-24/3-Q12P-C
Typ.
Max.
Line
Load
(V)
(V)
(mA)
Min.
Typ.
3.3
3.3
20
20
15
15
6
66
66
75
75
72
72
72
0.25ꢀ
0.25ꢀ
80
125
12
9-36
160
6.18
87ꢀ
89ꢀ
5.0
Please contact Murata Power Solutions for further information.
5.0
C77, P32
12.0
12.0
24.0
120
190
180
275
0.125ꢀ
0.05ꢀ
12
9-36
75
6.56
90ꢀ
91.5ꢀ
89.5ꢀ
6
Please contact Murata Power Solutions for further information.
0.125ꢀ
3
0.125ꢀ
12
9-36
110
6.70
88.3ꢀ
Please refer to the part number structure for additonal ordering model numbers and options.
All specifications are at nominal line voltage, nominal output voltage and full load, +25° C.
unless otherwise noted. See detailed specifications.
I/O caps are necessary for our test equipment and may not be needed for your application.
Load range: 0.1-3A. This is required only for our test equipment. The converter will operate at
zero output current.
Output capacitors are 1 µF ceramic || 10 µF electrolytic. Input cap is 100 µF. All caps are low
ESR types. Contact Murata Power Solutions for details.
PART NUMBER STRUCTURE
U W E - 12 / 6 - Q12 P B - C
Unipolar, Single-output
RoHS Hazardous Materials Compliance
C=RoHS-6, standard
Wide Input Range
Baseplate (optional)
Blank = No baseplate (standard)
B = Baseplate installed (optional special order)
Eighth-Brick Package
Nominal Output Voltage
On/Off Control Polarity
P = Positive polarity (standard for Q12 models)
N = Negative polarity (optional special order for Q12 models)
Input Voltage Range
Note:
Maximum Rated Output
Current in Amps
Q12 = 9-36 Volts
Q48 = 18-75 Volts
Some model number combinations may
not be available. Contact Murata Power
Solutions for further information.
DETAIL SPECIFICATIONS, Q12 MODELS
18
UWE-3.3/20-Q12
uWE-5/15-Q12
UWE-12/6-Q12
UWE-24/3-Q12
Specs are typical unless noted.
INPUT
Input voltage range
See ordering guide
none
Start-up threshold, Volts
Undervoltage shutdown, V.
Overvoltage shutdown, V.
Reflected (back) ripple current, mA pk-pk
Suggested external fuse, A
Input current
9.5
8.5
9
8
25
25
40
20
40
20
Full load conditions
See ordering guide
See ordering guide
0.1 A2sec
Inrush transient, A2sec
Input current if output is in short circuit, mA
No load, mA
0.1 A2sec
250
250
75
250
110
9.04
5
160
Low line (Vin=min.), Amps
Standby mode, mA
8.33
8
8.89
5
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MDC_UWE Series.A11 Page 2 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
DETAIL SPECIFICATIONS, CONTIUED
INPUT (continued)
UWE-3.3/20-Q12
uWE-5/15-Q12
UWE-12/6-Q12
UWE-24/3-Q12
(Off, UV, OT shutdown)
Internal input filter type
L-C
Reverse polarity protection
Remote On/Off control
Yes
Yes
OFF=Ground pin to +0.8V max.
ON=open pin or +3.5 to +Vin max.
OFF=open pin or +5V to +Vin max.
ON=Ground pin or 0 to +0.8V max.
1
Positive logic ("P" model suffix)
Negative logic ("N" model suffix)
Current, mA
OUTPUT
Voltage output range
Voltage output accuracy
Adjustment range
See ordering guide
1ꢀ of Vnom., (50ꢀ load)
-10 to +10ꢀ of Vnom.
0.02ꢀ of Vout range per °C
No minimum load
Temperature coefficient
Minimum loading
Remote sense compensation
Ripple/noise (20 MHz bandwidth)
Line/Load regulation
Efficiency
+10ꢀ max.
See ordering guide
See ordering guide
See ordering guide
Maximum capacitive loading, μF
low ESR <0.02Ω max., resistive load
10,000
4,700
1500
Isolation voltage
Input to Output, Volts min. DC
Input to baseplate, Volts min. DC
Baseplate to output, Volts min. DC
Isolation resistance, MΩ
Isolation capacitance, pF
Isolation safety rating
1500
1500
750
100
1500
27
1000
1000
4.0
Basic insulation
Current limit inception (98% of
Vout, after warmup), Amps
8.5
Short circuit protection method
Short circuit current, Amps
Short circuit duration
Current limiting, hiccup autorestart. Remove overload for recovery.
0.5
4.5
1.5
1.0
29
Continuous, output shorted to ground. No damage.
Overvoltage protection, Volts
(via magnetic feedback)
15
DYNAMIC CHARACTERISTICS
Dynamic load response, μSec
(50-75-50% load step) to 1%
of final value
50
Start-up time
Vin to Vout regulated, mSec
Remote On/Off to Vout regulated, mSec
Switching frequency, KHz
20
5
40
30
40
30
245 25
275 25
215 15
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MDC_UWE Series.A11 Page 3 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
DETAIL SPECIFICATIONS, CONTIUED
ENVIRONMENTAL
UWE-3.3/20-Q12
uWE-5/15-Q12
UWE-12/6-Q12
UWE-24/3-Q12
3,755,203 hours (UWE-12/6-Q12N-C)
1,248,001 hours (UWE-3.3/20-Q12)
Calculated MTBF (Telcordia SR-332)
Calculated MTBF (MIL-HDBK-217N2)
1,239,521 hours (UWE-12/6-Q12N-C)
1,089,141 hours (UWE-3.3/20-Q12)
Operating temperature range
with derating, °C (see Derating curves)
-40 to +85 with derating
Storage temperature range, °C
Thermal protection/shutdown, °C
Relative humidity
PHYSICAL
-55 to +125
+120
to +85°C/85ꢀ non-condensing
Outline dimensions
Pin material
See mechanical specs
Copper alloy
Pin Finish
Nickel underplate with gold overplate (see mechanical specs for details)
Pin diameter, inches
Pin diameter, mm
Weight, ounces
0.04/0.062
1.016/1.575
0.7
Weight, grams
20
Electromagnetic interference (conducted)
Safety
Designed to meet FCC part 15, class B, EN55022 conducted and CISPR22 class B conducted.
Designed to meet UL/cUL 60950-1, CSA-C22.2 No.60950-1, IEC/EN 60950-1
SPECIFICATION NOTES
CAUTION: This product is not internally fused. To comply with safety agency cer-
tifications and to avoid injury to personnel or equipment, the user must supply an
external fast-blow fuse to the input terminals. See fuse information.
All models are tested and specified with external 1µF and 10µF paralleled ceramic/
tantalum output capacitors and a 100 µF external input capacitor. All capacitors are
low ESR types. Contact Murata Power Solutions for details. These capacitors are
necessary to accommodate our test equipment and may not be required to achieve
specified performance in your applications. However, Murata Power Solutions
recommends using these capacitors in your application. All models are stable and
regulate within spec under no-load conditions.
9
All models are fully operational and meet published specifications, including “cold
start” at –40° C. At full power, the package temperature of all on-board components
must not exceed +128° C.
1
10 Regulation specifications describe the deviation as the line input voltage or output
load current is varied from a nominal midpoint value to either extreme.
11 If the user adjusts the output voltage, accuracy is dependent on user-supplied
trim resistors. To achieve high accuracy, use 1ꢀ or better tolerance metal-film
resistors. If no trim is installed, the converter will achieve its rated accuracy. Do not
exceed maximum power specifications when adjusting the output trim.
12 Output current limit and short circuit protection is non-latching. When the overcur-
rent fault is removed, the converter will immediately recover.
All specifications are typical unless noted. General conditions for Specifications are
+25° C, Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied
for extended testing under power.
13 Alternate pin length and/or other output voltages may be available under special
quantity order.
2
3
Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input
filtering is Cin=33 µF, Cbus=220 µF, Lbus=12 µH.
14 At zero output current, the output may contain low frequency components which
exceed the ripple specification. The output may be operated indefinitely with no
load.
Note that 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 Derating curves are presented at sea level altitude. Be aware
that power dissipation degrades as altitude increases.
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Issue
1, Case 3, Fits 266, ground fixed conditions, Tambient = +30° C, full output load,
natural air convection.
The Remote On/Off Control is normally controlled by a switch or open collector or
open drain transistor. But it may also be driven with external logic or by applying
appropriate external voltages which are referenced to Input Common.
Short circuit shutdown begins when the output voltage degrades approximately 2ꢀ
from the selected setting.
15 Input Fusing: To ensure reverse input protection with full output load, always con-
nect an external input fast-blow fuse in series with the +Vin input. Use approxi-
mately twice the full input current rating at the selected input voltage.
16 “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a
brief, full-current output. If the overcurrent condition still exists, the restart current
will be removed and then tried again. This short current pulse prevents overheating
and damaging the converter. Once the fault is removed, the converter immediately
recovers normal operation.
17 Note that the converter will operate up to the rated baseplate maximum tempera-
ture with the baseplate installed and properly heat sunk. To avoid thermal self-
protection shutdown, do not exceed this maximum baseplate temperature.
18 UWE-24/3-Q12 undervoltage shutdown of 8.0V is at half load.
19 UWE-24/3-Q12 output overvoltage protection requires 0.3A minimum load.
20 Pre-bias operation: Startup will succeed if the output setpoint voltage is higher than
the pre-existing external output voltage.
4
5
6
7
8
The outputs are not intended to sink appreciable reverse current.
Output noise may be further reduced by adding an external filter. See I/O Filtering
and Noise Reduction. Larger caps (especially low-ESR ceramic capacitors) may
slow transient response or degrade stability. Use only as much output filtering as
needed to achieve your noise requirements and no more. Thoroughly test your
system under full load with all components installed.
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MDC_UWE Series.A11 Page 4 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
MECHANICAL SPECIFICATIONS—NO BASEPLATE
2.30
(58.4)
TOP VIEW
ISOMETRIC
VIEW
0.90 (22.9)
.071±.002 STANDOFF
AT EACH
.040 PIN
END VIEW
SIDE VIEW
0.21 (5.3) @
.062 PINS
0.38 (9.7)
MAX
MOUNTING PLANE
.040±.002
AT PINS 1-3, 5-7
0.19 (4.8) @
.040 PINS
I/O CONNECTIONS
.062±.002
AT PINS 4 & 8
Pin
1
Function
- Vin
2
On/Off Control *
+Vin
3
0.15 (3.8)
PIN 1
2.000
(50.8)
4
5
6
7
8
- Vout
- Sense
Trim
PIN 4
PIN 5
+ Sense
+ Vout
BOTTOM VIEW
* The Remote On/Off can
be provided with either
positive (P suffix) or negative
(N suffix) polarity
.45
.300
.150
.600
REF
.600
.150
Connect each sense input to its
respective Vout if sense is not
connected at a remote load.
PIN 2
PIN 3
PIN 6
PIN 7
PIN 8
Dimensions are in inches (mm shown for ref. only).
MATERIAL:
Third Angle Projection
.040 PINS: C26000 BRASS, 3/4 HARD
.062 PINS: C10200 COPPER ALLOY, FULL HARD
FINISH: (ALL PINS)
GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
Components are shown for reference only.
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MDC_UWE Series.A11 Page 5 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
MECHANICAL SPECIFICATIONS (continued)—BASEPLATE INSTALLED
4X THRU
2.30
(58.4)
M2X0.4 - 6H
.15" MAX SCREW
PENETRATION
TOP VIEW
ISOMETRIC
VIEW
0.90 (22.9)
.625
.40
1.500
0.14 (3.6)
.071±.002 STANDOFF
AT EACH .040 PIN
ALUMINUM
BASEPLATE
END VIEW
SIDE VIEW
0.21 (5.3) @
.062 PINS
0.50 (12.7)
MOUNTING PLANE
.040±.002
AT PINS 1-3, 5-7
0.19 (4.8) @
.040 PINS
.062±.002
AT PINS 4 & 8
0.15 (3.8)
PIN 1
2.000
(50.8)
PIN 4
PIN 5
BOTTOM VIEW
.45
.300
.150
.600
REF
.600
.150
PIN 2
PIN 3
PIN 6
PIN 7
PIN 8
Dimensions are in inches (mm shown for ref. only).
MATERIAL:
Third Angle Projection
.040 PINS: C26000 BRASS, 3/4 HARD
.062 PINS: C10200 COPPER ALLOY, FULL HARD
FINISH: (ALL PINS)
GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
Components are shown for reference only.
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MDC_UWE Series.A11 Page 6 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
Soldering Guidelines
Undervoltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Be cautious when there is high atmo-
spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your
production environment may differ; therefore please thoroughly review these guidelines
Start-Up Time
The VIN to VOUT Start-Up Time is the interval of time between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input/output
capacitance, and load. The UWE Series implements a soft start circuit that
limits the duty cycle of its PWM controller at power up, thereby limiting the
input inrush current.
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
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on and the fully loaded output voltage enters and remains within its
specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control
to VOUT start-up time is also governed by the internal soft start circuitry and
external load capacitance.
105° C.
250° C.
6 seconds
Absolute Maximum Ratings
Input Voltage
Q12 Models - Volts, max. continuous
Volts, transient, 100 mSec
Q48 Models - Volts, max. continuous
0-36 VDC
0-50 VDC
0-75 VDC
The difference in start up time from VIN to VOUT and from On/Off Control to
VOUT is therefore insignificant.
Volts, transient, 100 mSec
On/Off Control
0-100 VDC
-0.7 V. min to +Vin max.
Input Source Impedance
UWE converters must be driven from a low ac-impedance input source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances. For optimum performance, compo-
nents should be mounted close to the DC/DC converter. If the application
has a high source impedance, low VIN models can benefit from increased
external input capacitance.
Input Reverse Polarity Protection
Output Overvoltage
See Fuse section.
Vout nom. +20ꢀ max.
Output Current (Note 7)
Devices can
Current-limited.
withstand sustained short circuit
without damage.
Overtemperature Protection
Device includes electronic over-
temperature shutdown protection
under normal operation.
-55 to +125° C.
I/O Filtering, Input Ripple Current, and Output Noise
Storage Temperature
Lead Temperature
All models in the UWE Converters are tested/specified for input reflected ripple
current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures.
See soldering specifications
Absolute maximums 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 or
recommended.
External input capacitors (CIN in Figure 2) serve primarily as energy-storage
elements, minimizing line voltage variations caused by transient IR drops in
conductors from backplane to the DC/DC. Input caps should be selected for bulk
capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current
ratings. The switching nature of DC/DC converters requires that dc voltage
sources have low ac impedance as highly inductive source impedance can affect
system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your
specific system configuration may necessitate additional considerations.
TECHNICAL NOTES
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 exist. For MPS UWE DC/DC Converters, you should use fast-blow type
fuses, installed in the ungrounded input supply line. Refer to the specifications
for fuse values.
TO
CURRENT
PROBE
OSCILLOSCOPE
+INPUT
LBUS
+
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the convert-
ers must be installed in compliance with the requirements of the end-use
safety standard, e.g., IEC/EN/UL60950-1.
VIN
CBUS
CIN
–
–INPUT
CIN = 33µF, ESR < 700mΩ @ 100kHz
CBUS = 220µF, ESR < 100mΩ @ 100kHz
LBUS = 12µH
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 input voltage drops below the
Figure 2. Measuring Input Ripple Current
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MDC_UWE Series.A11 Page 7 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using filter-
ing techniques, the simplest of which is the installation of additional external
output capacitors. These output caps function as true filter elements and
should be selected for bulk capacitance, low ESR and appropriate frequency
response. All external capacitors should have appropriate voltage ratings and
be located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration.
Thermal Shutdown
These UWE converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the internal temperature of the DC/DC converter to
rise above the designed operating temperature, a precision temperature sensor
will power down the unit. When the internal temperature decreases below the
threshold of the temperature sensor, the unit will self start. See Performance/
Functional Specifications.
Output Overvoltage Protection
The most effective combination of external I/O capacitors will be a function
of line voltage and source impedance, as well as particular load and layout
conditions. Our Applications Engineers can recommend potential solutions and
discuss the possibility of our modifying a given device's internal filtering to
meet your specific requirements. Contact our Applications Engineering Group
for additional details.
UWE output voltages are monitored for an overvoltage condition via magnetic
feedback. The signal is coupled to the primary side and if the output voltage
rises to a level which could be damaging to the load, the sensing circuitry will
power down the PWM controller causing the output voltages to decrease. Fol-
lowing a time-out period the PWM will restart, causing the output voltages to
ramp to their appropriate values. If the fault condition persists, and the output
voltages again climb to excessive levels, the overvoltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as "hiccup" mode.
In Figure 3, the two copper strips simulate real-world pcb impedances
between the power supply and its load. In order to minimize measurement
errors, scope measurements should be made using BNC connectors, or the
probe ground should be less than ½ inch and soldered directly to the fixture.
Current Limiting
As soon as the output current increases to substantially above its rated value,
the DC/DC converter will go into a current-limiting mode. In this condition, the
output voltage will decrease proportionately with increases in output current,
thereby maintaining somewhat constant power dissipation. This is commonly
referred to as power limiting. Current limit inception is defined as the point at
which the full-power output voltage falls below the specified tolerance. See
Performance/Functional Specifications. If the load current, being drawn from
the converter, is significant enough, the unit will go into a short circuit condition
as specified under "Performance."
COPPER STRIP
+SENSE
+OUTPUT
R
LOAD
SCOPE
C1
C2
–OUTPUT
–SENSE
COPPER STRIP
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as
the output current demand increases. If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller. Following a time-out period,
the PWM will restart causing the output voltages to begin ramping to their
appropriate values. If the short-circuit condition persists, another shutdown
cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The
hiccup cycling reduces the average output current, thereby preventing internal
temperatures from rising to excessive levels. The UWE is capable of enduring
an indefinite short circuit output condition.
C1 = 0.47µF CERAMIC
C2 = NA
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating" with
respect to their input. Designers will normally use the –Output as the ground/
return of the load circuit. You can, however, use the +Output as ground/return
to effectively reverse the output polarity.
Features and Options
Minimum Output Loading Requirements
On/Off Control
UWE converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
The input-side, remote On/Off Control function can be ordered to operate with
either polarity:
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MDC_UWE Series.A11 Page 8 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
Positive-polarity models (“P" part-number suffix) are enabled when the
On/Off Control is left open or is pulled high, as per Figure 4. Positive-polarity
devices are disabled when the On/Off Control is pulled low.
+OUTPUT
–INPUT
+SENSE
Negative-polarity devices (“N” suffix) are off when the On/Off Control is open
(or pulled high), and on when the On/Off Control is pulled low with respect to
–Vin as shown in Figure 5.
20kΩ
5-20
TURNS
ON/OFF
CONTROL
LOAD
TRIM
–SENSE
+INPUT
–OUTPUT
+ Vcc
ON/OFF CONTROL
CONTROL
Figure 6. Trim Connections Using A Trimpot
+OUTPUT
–INPUT
+SENSE
TRIM
-INPUT
ON/OFF
CONTROL
LOAD
R1
Figure 4. Driving the Positive Polarity On/Off Control Pin
–SENSE
–OUTPUT
+INPUT
+INPUT
+VCC
Figure 7. Trim Connections To Increase Output Voltages Using a Fixed Resistor
ON/OFF
CONTROL
+OUTPUT
–INPUT
+SENSE
–INPUT
ON/OFF
TRIM
–SENSE
LOAD
CONTROL
R2
Figure 5. Driving the Negative Polarity On/Off Control Pin
+INPUT
–OUTPUT
Figure 8. Trim Connections To Decrease Output Voltages
Dynamic control of the remote on/off function is facilitated with a mechanical
relay or an open-collector/open-drain drive circuit (optically isolated if appropri-
A single resistor connected from the Trim to the +Output, or +Sense where
applicable, will increase the output voltage in this configuration. A resistor con-
ate). The drive circuit should be able to sink appropriate current (see Performance nected from the Trim to the –Output, or –Sense where applicable, will decrease
Specs) when activated and withstand appropriate voltage when deactivated.
Applying an external voltage to the On/Off Control when no input power is
applied to the converter can cause permanent damage to the converter.
the output voltage in this configuration.
Trim adjustments greater than the specified range can have an adverse
affect on the converter's performance and are not recommended. Excessive
voltage differences between VOUT and Sense, in conjunction with trim adjust-
ment of the output voltage, can cause the overvoltage protection circuitry to
activate (see Performance Specifications for overvoltage limits). Power derating
is based on maximum output current and voltage at the converter’s output
pins. Use of trim and sense functions can cause output voltages to increase,
thereby increasing output power beyond the converter's specified rating or
cause output voltages to climb into the output overvoltage region. Therefore:
Trimming Output Voltage
UWE converters have a trim capability that allows users to adjust the output
voltages. Adjustments to the output voltages can be accomplished via a trim pot
(Figure 6) or a single fixed resistor as shown in Figures 7 and 8. A single fixed
resistor can increase or decrease the output voltage depending on its connec-
tion. The resistor should be located close to the converter and have a TCR less
than 100ppm/°C to minimize sensitivity to changes in temperature. If the trim
function is not used, leave the trim pin floating.
(VOUT at pins) x (IOUT) <= rated output power
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MDC_UWE Series.A11 Page 9 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
Remote Sense Note: The Sense and VOUT lines are internally connected
through low value resistors. Nevertheless, if the sense function is not used for
remote regulation the user should connect the +Sense to +VOUT and –Sense to
–VOUT at the DC/DC converter pins.
Trim Equations
3.3 Volt Output
Trim Up
Trim Down
UWE series converters have a sense feature to provide point of use regula-
tion, thereby overcoming moderate IR drops in pcb conductors or cabling.
The remote sense lines carry very little current and therefore require minimal
cross-sectional-area conductors. The sense lines are used by the feedback
control-loop to regulate the output. As such, they are not low impedance points
and must be treated with care in layouts and cabling. Sense lines on a pcb
should be run adjacent to dc signals, preferably ground. In cables and discrete
wiring applications, twisted pair or other techniques should be implemented.
16.31
13.3(VO – 1.226)
VO – 3.3
–10.2
–10.2
–10.2
–10.2
–10.2
RTDOWN (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
3.3 – VO
5 Volt Output
25.01
20.4(VO – 1.226)
VO – 5
–10.2
RTDOWN (kΩ) =
5 – VO
12 Volt Output
UWE series converters will compensate for drops between the output volt-
age at the DC/DC and the sense voltage at the DC/DC provided that:
60.45
49.6(VO – 1.226)
VO – 12
–10.2
RTDOWN (kΩ) =
12 – VO
[VOUT(+) –VOUT(–)] –[Sense(+) –Sense (–)] ≤ 5ꢀ VOUT
24 Volt Output
RTDOWN (kΩ) =
Output overvoltage protection is monitored at the output voltage pin, not
the Sense pin. Therefore, excessive voltage differences between VOUT and
Sense in conjunction with trim adjustment of the output voltage can cause the
overvoltage protection circuitry to activate (see Performance Specifications
for overvoltage limits). Power derating is based on maximum output current
and voltage at the converter’s output pins. Use of trim and sense functions can
cause output voltages to increase thereby increasing output power beyond the
UWE’s specified rating or cause output voltages to climb into the output over-
voltage region. Also, the use of Trim Up and Sense combined may not exceed
+10ꢀ of VOUT. Therefore, the designer must ensure:
124.2
101(VO – 1.226)
VO – 24
–10.2
24 – VO
Note: Resistor values are in kΩ. Adjustment accuracy is subject to resistor
tolerances and factory-adjusted output accuracy. VO = desired output voltage.
(VOUT at pins) x (IOUT) ≤ rated output power
Contact and PCB resistance
losses due to IR drops
+OUTPUT
–INPUT
IOUT
+SENSE
Sense Current
ON/OFF
CONTROL
TRIM
–SENSE
LOAD
Sense Return
IOUT Return
+INPUT
–OUTPUT
Contact and PCB resistance
losses due to IR drops
Figure 9. Remote Sense Circuit Configuration
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MDC_UWE Series.A11 Page 10 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
PERFORMANCE DATA
UWE-12/6-Q12N
Efficiency vs. Line Voltage and Load Current @ 25°C
Power Dissipation vs. Load Current @ 25°C
10
9
8
7
6
5
4
3
2
1
94
92
90
88
86
84
82
80
78
76
74
72
70
68
Vin = 36 V
Vin = 30 V
Vin = 24 V
Vin = 12 V
Vin = 10 V
Vin = 9 V
Vin = 36 V
Vin = 30 V
Vin = 24 V
Vin = 12 V
Vin = 10 V
Vin = 9 V
1
2
3
4
5
6
1
2
3
4
5
6
Load Current (Amps)
Load Current (Amps)
UWE-12/6-Q12N
Maximum Current Temperature Derating @ sea level
Maximum Current Temperature Derating @sea level
(Vin = 12V, transverse airflow, no baseplate)
(Vin = 12V, transverse airflow, with baseplate)
6.0
6.0
5.5
5.0
4.5
4.0
Natural Convection
100 LFM
Natural Convection
5.5
200 LFM
300+ LFM
100 LFM
200 LFM
300 LFM
400 LFM
5.0
4.5
4.0
40
45
50
55
60
65
70
75
80
85
90
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
Ambient Temperature (°C)
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MDC_UWE Series.A11 Page 11 of 12
UWE Series
Wide Input, Isolated
Eighth-Brick DC/DC Converters
PERFORMANCE DATA
UWE-24/3-Q12P
Efficiency vs. Line Voltage and Load Current @ 25°C
Power Dissipation vs. Load Current @ 25°C
95
93
91
89
87
85
83
81
79
77
75
73
71
69
67
65
12
11
10
9
8
Vin = 36 V
Vin = 30 V
Vin = 24 V
Vin = 12 V
Vin = 10 V
Vin = 9 V
7
6
Vin = 36 V
Vin = 30 V
Vin = 24 V
Vin = 12 V
Vin = 10 V
Vin = 9 V
5
4
3
0.5
1
1.5
2
2.5
3
2
Load Current (Amps)
0.5
1
1.5
2
2.5
3
Load Current (Amps)
UWE-24/3-Q12P
Maximum Current Temperature Derating @ sea level
Maximum Current Temperature Derating @sea level
(Vin = 12V, transverse airflow, no baseplate)
(Vin = 12V, transverse airflow, with baseplate)
3.20
3.10
3.00
3.20
3.00
2.80
2.60
2.40
2.90
Natural Convection
100 LFM
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
2.80
2.70
2.60
2.50
2.40
200 LFM
300 LFM
400 LFM
40
45
50
55
60
65
70
75
80
85
90
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
Ambient Temperature (°C)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Canada:
UK:
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
France:
Germany:
Japan:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
11/17/08
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
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.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UWE Series.A11 Page 12 of 12
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