ULQ-5/15-D48N-C [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, 75W, Hybrid, PACKAGE-8;型号: | ULQ-5/15-D48N-C |
厂家: | muRata |
描述: | DC-DC Regulated Power Supply Module, 1 Output, 75W, Hybrid, PACKAGE-8 |
文件: | 总17页 (文件大小:851K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ULQ Models
s
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
To Be Discontinued*
Typical units
Features
For applications requiring improved electrical and thermal perfomance at reduced cost DATEL's
new ULQ Series "Quarter-Brick" DC-DC Converters suit perfectly. They measure just 1.45 x 2.30 x
0.35 inches (36.8 x 58.4 x 8.9mm) and fit the industry-standard footprint. You can also "pick-and-
place" the ULQ-SMT version optimizing your automated SMT process.
From an 18-36V or 36-75V input, ULQ's deliver outputs of 1.2, 1.5, 1.8, or 2V fully rated at 15 or
25A, 2.5 or 3.3V at 15 or 20A, 5V at 15A and 12V at 8-10A. They
employ an interleaved, synchronous-rectifier topology that exploits 100% of their duty cycle. They
simultaneously achieve ultra-high efficiency (to 91%), tight line/load regulation ( 0.125/0.25%), low
noise (25-70mVp-p), and quick step response (200µsec).
A state of the art, single-board, open-frame design with reduced component count, high
efficiency, low-on-resistance FET's, and planar magnetics embedded in heavy-copper pc boards all
contribute to impressive thermal derating.
■
Standard quarter-brick package/pinout
in through-hole or SMT version
■
Low cost; Low profile, 0.35" (8.9mm)
■
24V and 48V nominal inputs
■
Output current: 8 to 25 Amps
■
Output voltages: 1.2/1.5/1.8/2/2.5/3.3/5/12V
■
Interleaved synchronous-rectifier topology
·
·
Ultra high efficiency
No output reverse conduction
■
■
■
■
■
■
■
Outstanding thermal performance
On/off control, trim & sense functions
Fully isolated, 2250Vdc (BASIC)
Output overvoltage protection
Fully I/O protected; Thermal shutdown
UL/EN/IEC60950 safety approvals
Qual/HALT/EMI tested
The ULQ's feature set includes high isolation (2250Vdc), input pi filters, input undervoltage shut-
down, output overvoltage protection, current limiting, short-circuit protection and thermal shutdown.
The standard footprint carries on/off control (positive or negative logic), output trim (+10/–20%) and
output sense functions.
All ULQ quarter-bricks are designed to meet the BASIC-insulation requirements of UL/EN/
IEC60950 and they will carry the CE mark. Safety certifications, EMC compliance testing and qualifi-
cation testing (including HALT) are currently in progress. Contact DATEL for latest updates.
+SENSE
(7)
+VOUT
(8)
+VIN
(1)
SWITCH
CONTROL
–VOUT
(4)
–VIN
(3)
–SENSE
(5)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
VOUT
TRIM
(6)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
* Can be ordered with positive (standard) or negative (optional) polarity.
REMOTE
ON/OFF
CONTROL*
(2)
Figure 1. Simplified Schematic
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 1 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Performance Specifications and Ordering Guide ➀
ORDERING GUIDE
Output
R/N (mVp-p) ➁
Input
Package
(Case,
Efficiency
Regulation (Max.)
Root Model ➄
Vout
Vin Nom. Range
Iout ➁
IIN ➃
Pinout)
(Volts)
(Volts) (Volts) (mA/A)
35/0.5
50/1.8 85.5%
30/0.9 85%
(Amps)
Typ.
25
50
45
25
50
70
25
50
70
35
45
50
45
50
50
95
90
45
50
45
50
50
95
90
Max.
50
Line
Min.
87%
Typ.
89%
Load ➂
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.4%
ULQ-1.5/15-D48N-C
ULQ-1.5/25-D24P-C
ULQ-1.5/25-D48N-C
ULQ-1.8/15-D48N-C
ULQ-1.8/25-D24P-C
ULQ-1.8/25-D48N-C
ULQ-2/15-D48N-C
ULQ-2/25-D24P-C
ULQ-2/25-D48N-C
ULQ-2.5/15-D48N-C
ULQ-3.3/15-D48NM-C
ULQ-3.3/20-D24PM-C
ULQ-3.3/20-D48NM-C
ULQ-5/15-D24PM-C
ULQ-5/15-D48NM-C
ULQ-12/8-D24PM-C
ULQ-12/10-D48NM-C
ULQ-3.3/15-D48N-C
ULQ-3.3/20-D24P-C
ULQ-3.3/20-D48N-C
ULQ-5/15-D24P-C
ULQ-5/15-D48N-C
ULQ-12/8-D24P-C
ULQ-12/10-D48N-C
1.5
1.5
1.5
1.8
1.8
1.8
2
15
25
25
15
25
25
15
25
25
15
15
20
20
15
15
8
0.125%
0.125%
0.125%
0.125%
0.125%
0.25%
0.125%
0.125%
0.25%
0.125%
0.125%
0.125%
0.125%
0.25%
0.1%
48
24
48
48
24
48
48
24
48
48
48
24
48
24
48
24
48
48
24
48
24
48
24
48
36-75
18-36
36-75
36-75
18-36
36-75
36-75
18-36
36-75
36-75
36-75
18-36
36-75
18-36
36-75
18-36
36-75
36-75
18-36
36-75
18-36
36-75
18-36
36-75
C37, P32
C37, P32
100
75
87.5%
87%
C37, P32
50
35/0.6 87.5%
90/2.2 85.5%
45/1.1 85.5%
89%
C37, P32
100
100
50
87.5%
87.5%
89%
C37, P32
C37, P32
45/0.6
50/2.4
50/1.2
45/0.9
87%
86%
86%
88%
C37, P32
2
100
100
55
88%
C37, P32
2
88%
C37, P32
2.5
3.3
3.3
3.3
5
89.5%
90.5%
89.5%
90%
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
75
45/1.2 88.5%
80/3.1 87.5%
100
75
45/1.6
50/3.5
50/1.7
90/4.4
80/2.9
88%
89%
89%
89%
88%
100
100
130
130
75
91%
5
91%
12
12
3.3
3.3
3.3
5
0.25%
0.25%
0.125%
0.125%
0.125%
0.25%
0.1%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.4%
90.5%
90%
10
15
20
20
15
15
8
45/1.2 88.5%
80/3.1 87.5%
90.5%
89.5%
90%
100
75
To Be Discontinued*
To Be Discontinued*
45/1.6
50/3.5
50/1.7
90/4.4
80/2.9
88%
89%
89%
89%
88%
100
100
130
130
91%
5
91%
12
12
0.25%
0.25%
0.25%
0.25%
90.5%
90%
To Be Discontinued*
10
*LAST TIME BUY: 4/1/2018. CLICK HERE FOR DISCONTINUANCE NOTICES.
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are
specified with an external 1µF multi-layer ceramic and 10µF capacitors across their output pins.
➁ Ripple/Noise (R/N) measured over a 20MHz bandwidth.
➃ Nominal line voltage, no load/full load condition.
➄ Please refer to the Part Number Structure when ordering.
➅ Not all model number combinations are available. Consult Murata Power Solutions.
➂ Devices have no minimum-load requirements and will regulate under no-load conditions.
Regulation specifications describe the output voltage deviation as the line voltage or load is
varied from its nominal/midpoint value to either extreme. (Load step = 50%.)
ULQ-12/8-D24N-C
ULQ-12/8-D24NL1-C
ULQ-12/8-D24NL2-C
ULQ-12/8-D24P-C
ULQ-12/8-D24PL1-C
ULQ-3.3/15-D48N-C
ULQ-3.3/15-D48P-C
ULQ-3.3/15-D48PL1-C
ULQ-12/10-D48NL2-C
ULQ-3.3/20-D24N-C
ULQ-3.3/20-D24NL2-C
ULQ-3.3/20-D24P-C
ULQ-3.3/20-D24PL1-C
ULQ-12/10-D48PL2-C
ULQ-3.3/20-D24PL2-C
ULQ-5/15-D48N-C
ULQ-5/15-D48P-C
ULQ-5/15-D48PL2-C
ULQ-12/10-D48NL1-C
P A R T N U M B E R S T R U C T U R E
- C
RoHS-6 compliant
U LQ - 3.3 / 20 D48 N M Lx
-
Output
Configuration
Pin Length Option
Quarter-Brick Package
Nominal Output Voltage
Surface-Mount Package
(see list above)
Maximum Rated Output
Remote On/Off Control Logic
Input Voltage Range
See page 16 for complete Part Number Structure.
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MDC_ULQ-15A.E04 Page 2 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Environmental
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, full-load conditions, unless noted. (1)
Input
(13)
Calculated MTBF:
TBD million hours
Input Voltage Range: (2)
D24 Models
D48 Models
(4) (14)
Operating Temperature (Ambient):
See derating curves
–40 to +85°C with derating
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
(4) (7)
PCB Temperature:
Maximum Allowable
Thermal Shutdown
Overvoltage Shutdown
D24 Models
D48 Models
+100°C
+105 to 120°C, +115°C typical
37-41 Volts (39V typical)
None (3)
Physical
See Mechanical Dimensions
Start-Up Threshold: (4)
D24 Models
D48 Models
Dimensions
16-18 Volts (17.5V typical)
34-36 Volts (35V typical)
Pin Material (through-hole)
Gold-plated copper alloy with nickel
underplate
Undervoltage Shutdown: (4)
D24 Models
D48 Models
Pad Material (SMT)
Weight:
Copper alloy, pure tin over nickel underplate
1 ounce (28 grams)
15.5-17.5 Volts (16.75V typical)
32.5-34.5 Volts (33.5V typical)
Primary-to-Secondary Insulation Level Basic
Input Current:
EMI Conducted and Radiated
FCC Part 15, EN55022 may require
external filter
Normal Operating Conditions
Inrush Transient
Short Circuit
See Ordering Guide
0.05A2 sec maximum
50-100mA
Safety
UL/IEC/EN60950-1 CSA-C22.2 No. 234
Standby Mode:
Off, UV, Thermal Shutdown
4-10mA
Input Reflected Ripple Current (5)
Internal Input Filter Type
8-50mAp-p
(1)
All models are tested and specified with external output capacitors (1µF ceramic in parallel
with 10µF tantalum), unless otherwise noted. These converters have no minimum-load require-
ments and will effectively regulate under no-load conditions.
Pi
Reverse-Polarity Protection (3)
1 minute duration, 5A maximum
(2)
(3)
(4)
(5)
Contact Murata Power Solutions for input voltage ranges other than those listed.
See Absolute Maximum Ratings for allowable input voltages.
(6)
Remote On/Off Control (Pin 2):
Positive Logic ("P" Suffix Models)
On = open, open collector or
3.5-13V applied
See Technical Notes/Performance Curves for additional explanations and details.
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF input
Off = pulled low to 0-0.8V IIN = 6mA max.
On = pulled low to 0-0.8V IIN = 6mA max.
Off = open, open collector or
3.5-13V applied
capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input
Ripple Current and Output Noise for details.
(6)
Negative Logic ("N" Suffix Models)
The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the
application of appropriate voltages (referenced to –Input (pin 1)). See Remote On/Off Control
for more details.
(7)
Output
All models are fully operational and meet published specifications, including "cold start," at –40°C.
Minimum Loading
No load
(8)
Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over
all normal operating ranges and combinations of input voltage, output load and temperature.
VOUT Accuracy (Full Load):
Initial
(9)
See Output Trimming for detailed trim equations.
1.25% maximum
0.02% per °C
3%
(10)
The Current-Limit Inception point is the output current level at which the ULQ’s power-limiting
Temperature Coefficient
Extreme (8)
circuitry drops the output voltage 2% from its initial value. See Output Current Limiting and
Short-Circuit Protection for more details.
(11)
VOUT Trim Range (9)
+10%, –20%
See Performance Curves for additional information.
(12)
(4)
For the Start-Up Time specifications, output settling is defined by the output voltage having
reached 1% of its final value.
(13)
Remote Sense Compensation
+10%
Ripple/Noise (20MHz BW)
Line/Load Regulation
Efficiency
See Ordering Guide
See Ordering Guide
See Ordering Guide
MTBF’s are calculated using Telcordia (Bellcore) Method 1 Case 3, ground fixed conditions,
+40°C case temperature, and full-load conditions.
Isolation Voltage: Input-to-Output
2000Vdc minimum, D24 models
2250Vdc minimum, D48 models
Absolute Maximum Ratings
Input Voltage:
Continuous:
D24V Models
See OVP
NA
D48V Models
81 Volts
100 Volts
Isolation Resistance
Isolation Capacitance
100MΩ
470pF
Transient (100msec):
Current Limit Inception (98% VOUT) (10)
After warmup
Input Reverse-Polarity Protection
Input Current must be <5A. 1 minute
duration. Fusing recommended.
+125% of maximum rated current
Short Circuit: (4)
Current
Duration
Output Current
Current limited. Devices can withstand
an indefinite output short circuit.
Hiccup with auto-restart
Continuous
On/Off Control (Pin 2) Max. Voltages
Referenced to –Input (pin 1)
Overvoltage Protection: (4)
OVP method
VOUT nominal +20%
Comparator magnetic feedback
–0.3 to +13.6 Volts
–55 to +125°C
Storage Temperature
Dynamic Characteristics
Dynamic Load Response (11)
(50% Load Step)
Lead Temperature
Through-hole Soldering
SMT Soldering
+300°C, 10 seconds
Refer to solder profile
60-300µsec, model dependent
Start-Up Time: (4) (12)
VIN to VOUT; On/Off to VOUT
30msec typical, 50msec maximum
160-300kHz, model dependent
4700 to 10,000µF, model dependent
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
Switching Frequency
Maximum Capacitive Load
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MDC_ULQ-15A.E04 Page 3 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
A built-in hysterisis for all models will not allow the converter to restart until
T E C H N I C A L N O T E S
Input Fusing
the input voltage is sufficiently reduced.
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 ULQ series DC-DC converters, we recommend
the use of a time delay fuse, installed in the ungrounded input supply line,
with a value no greater than 20 Amps.
All 48VIN models have the overvoltage shutdown function disabled, based
on requirements to withstand brief input surges and transients to 100V for
up to 100msec without voltage interruption. Contact DATEL to have input
overvoltage shutdown for 48VIN models enabled.
Input Source Impedance
As a rule of thumb however, we recommend the use of a normal-blow or
slow-blow fuse with a typical value about twice the maximum input current,
calculated at low line with the converter's minimum efficiency.
The input of ULQ converters must be driven from a low ac-impedance
source. The DC-DC's performance and stability can be compromised by the
use of highly inductive source impedances. The input circuit shown in Figure
2 is a practical solution that can be used to minimize the effects of induc-
tance in the input traces. For optimum performance, components should be
mounted close to the DC-DC converter.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the
converters must be installed in compliance with the requirements of the end-
use safety standard, i.e. IEC/EN/UL60950.
I/O Filtering, Input Ripple Current, and Output Noise
Input Reverse-Polarity Protection
All models in the ULQ Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output compo-
nents/circuits and layout as shown in the following two figures. 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 capaci-
tance (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.
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropiately fused, it
could cause permanent damage to the converter.
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
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 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.
TO
CURRENT
PROBE
OSCILLOSCOPE
1
+VIN
–VIN
Start-Up Time
L
BUS
+
The VIN to VOUT Start-Up Time is the time interval 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 capaci-
tance, and the slew rate and final value of the input voltage as it appears at
the converter. The ULQ Series implements a soft start circuit to limit the duty
cycle of its PWM controller at power up, thereby limiting the input inrush current.
V
IN
C
BUS
CIN
–
3
C
IN = 33µF, ESR < 700mΩ @ 100kHz
BUS = 220µF, ESR < 100mΩ @ 100kHz
C
L
BUS = 12µH
Figure 2. Measuring Input Ripple Current
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 (released) and the fully loaded output voltage enters and remains
within its specified accuracy band.
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using fil-
tering techniques, the simplest of which is the installation of additional exter-
nal output capacitors. They 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. 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.
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. The difference in start up time from VIN to VOUT and from On/Off
Control to VOUT is therefore insignificant.
Input Overvoltage Shutdown
All 24VIN ULQ DC-DC's are equipped with input overvoltage protection. Input
voltages exceeding the input overvoltage shutdown specification listed in the
Performance/Functional Specifications will cause the device to shutdown.
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 4 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
tion, 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 toler-
ance. 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 described below.
7
8
+SENSE
+VOUT
RLOAD
SCOPE
C1
C2
4
5
Short Circuit Condition
–VOUT
–SENSE
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 voltage to begin ramping to their
appropriate value. 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 ULQ Series is
capable of enduring an indefinite short circuit output condition.
C1 = 1µF
C2 = 10µF TANTALUM
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 (pin 4) as the
ground/return of the load circuit.You can however, use the +Output (pin 8) as
ground/return to effectively reverse the output polarity.
F E A T U R E S A N D O P T I O N S
Remote Sense
Minimum Output Loading Requirements
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.
ULQ converters employ a synchronous-rectifier design topology and all
models regulate within spec and are stable under no-load to full load condi-
tions. Operation under no-load conditions however might slightly increase the
output ripple and noise.
ULQ series converters employ 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, which are capacitively
coupled to their respective output 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.
Thermal Shutdown
The ULQ converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the 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
ULQ series converters will compensate for drops between the output voltage
at the DC-DC and the sense voltage at the DC-DC provided that:
The ULQ output voltage is monitored for an overvoltage condition using a
comparator. The signal is optically coupled to the primary side and if the
output voltage rises to a level which could be damaging to the load, the sens-
ing circuitry will power down the PWM controller causing the output voltage
to decrease. Following a time-out period the PWM will restart, causing the
output voltage to ramp to its appropriate value. If the fault condition persists,
and the output voltage again climbs to excessive levels, the overvoltage
circuitry will initiate another shutdown cycle. This on/off cycling is referred to
as "hiccup" mode.
[VOUT(+) –VOUT(–)] – [Sense(+) –Sense (–)] ≤ 10% VOUT
Contact and PCB resistance
losses due to IR drops
8
1
+VOUT
+VIN
IOUT
7
+SENSE
Sense Current
2
3
ON/OFF
CONTROL
6
5
TRIM
–SENSE
–VOUT
LOAD
Sense Return
Current Limiting
IOUT Return
As soon as the output current increases to approximately 130% of its rated
value, the DC-DC converter will go into a current-limiting mode. In this condi-
4
–VIN
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Configuration
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MDC_ULQ-15A.E04 Page 5 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7) will
increase the output voltage. A resistor connected from the Trim Pin (pin 6) to
the –Sense (pin 5) will decrease the output voltage.
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 over-
voltage 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 conveter's specified rating, or cause output voltages to climb into the
output overvoltage region. Therefore, the designer must ensure:
Trim adjustments greater than the specified +10%/–20% 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 adjustment of the output voltage, can cause the overvoltage protection
circuitry to activate (see Performance Specifications for overvoltage limits).
Temperature/power derating is based on maximum output current and volt-
age at the converter's output pins. Use of the 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:
(VOUT at pins) × (IOUT) ≤ rated output power
Trimming Output Voltage
ULQ converters have a trim capability (pin 6) that enables users to adjust
the output voltage from +10% to –20% (refer to the trim equations and trim
graphs that follow). Adjustments to the output voltage can be accomplished
via a trim pot (Figure 5) or a single fixed resistor as shown in Figures 6 and 7.
A single fixed resistor can increase or decrease the output voltage depending
on its connection. Resistors should be located close to the converter and
have TCR's less than 100ppm/°C to minimize sensitivity to changes in
temperature. If the trim function is not used, leave the trim pin open.
(VOUT at pins) x (IOUT) ≤ rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be suscep-
tible to noise pickup when connected to long conductors in noisy environ-
ments. In such cases, a 0.22µF capacitor can be added to reduce this long
lead effect.
Trim Equations
ULQ-1.2/15-D48 & ULQ-1.2/25-D48
1.308(VO – 0.793)
VO – 1.2
1.037
–1.413
–1.413
–10.2
–10.2
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTDOWN (kΩ) =
1.2 – VO
8
1
+VOUT
+VIN
ULQ-1.5/15-D48, ULQ-1.5/25-D24 & D48
7
+SENSE
6.23(VO – 1.226)
7.64
1.5 – VO
6
–10.2
2
5-22
TURNS
RTDOWN (kΩ) =
ON/OFF
CONTROL
TRIM
–SENSE
–VOUT
LOAD
VO – 1.5
5
4
ULQ-1.8/15-D48, ULQ-1.8/25-D24 & D48
3
9.12
1.8 – VO
7.44(VO – 1.226)
–VIN
–10.2
RTDOWN (kΩ) =
VO – 1.8
Figure 5.Trim Connections Using A Trimpot
ULQ-2/15-D48, ULQ-2/15-D24 & D48
10.15
2 – VO
8.28(VO – 1.226)
–10.2
–10.2
8
–10.2
RTDOWN (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
1
+VOUT
+VIN
VO – 2
7
ULQ-2.5/15-D48, ULQ-2.5/20-D24 & D48
+SENSE
2
6
10(VO – 1.226)
VO – 2.5
12.26
2.5 – VO
ON/OFF
CONTROL
TRIM
LOAD
–10.2
RTDOWN (kΩ) =
RTRIM UP
5
–SENSE
ULQ-3.3/15-D48, ULQ-3.3/20-D24 & D48
3
4
–VIN
–VOUT
16.31
13.3(VO – 1.226)
–10.2
–10.2
–10.2
–10.2
RTDOWN (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
3.3 – VO
VO – 3.3
Figure 6.Trim Connections To Increase Output Voltages Using Fixed Resistors
ULQ-5/15-D24, -D48
8
25.01
20.4(VO – 1.226)
VO – 5
1
+VOUT
+VIN
–10.2
RTDOWN (kΩ) =
5 – VO
7
+SENSE
ULQ-12/8-D24, ULQ-12/10-D48
2
3
6
5
4
ON/OFF
CONTROL
TRIM
–SENSE
–VOUT
LOAD
60.45
49.6(VO – 1.226)
RTRIM DOWN
–10.2
RTDOWN (kΩ) =
12 – VO
VO – 12
–VIN
Note: Resistor values are in kΩ. Adjustment accuracy is subject to resistor
tolerances and factory-adjusted output accuracy. VO = desired output voltage.
Figure 7.Trim Connections To Decrease Output Voltages Using Fixed Resistors
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 6 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Trim-Up Resistance vs. Percentage Increase in Output Voltage
Model ULQ-2.5
1 x 107
1 x 106
1 x 105
Model ULQ-1.5
1 x 107
1 x 106
1 x 105
1 x104
1 x104
1 x103
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
VOUT INCREASE (%)
VOUT INCREASE (%)
Model ULQ-3.3
Model ULQ-1.8
1 x 107
1 x 107
1 x 106
1 x 105
1 x104
1 x 106
1 x 105
1 x104
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
VOUT INCREASE (%)
VOUT INCREASE (%)
Trim-Down Resistance vs. Percentage Decrease
Model ULQ-2
1 x 107
in Output Voltage
1 x 107
Model ULQ-1.5
Model ULQ-1.8
Model ULQ-2
Model ULQ-2.5
Model ULQ-3.3
1 x 106
1 x 105
1 x104
1 x 106
1 x 105
0
1
2
3
4
5
6
7
8
9
10
1 x104
0
2
4
6
8
10
12
14
16
18
20
VOUT INCREASE (%)
VOUT DECREASE (%)
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MDC_ULQ-15A.E04 Page 7 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
On/Off Control ("P" or "N" suffix)
The input-side, remote On/Off Control function (pin 2) can be ordered to
operate with either logic type:
+VIN
1
2
+VCC
"P" suffix: Standard models are equipped with Positive-logic and these
devices are enabled when pin 2 is left open (or is pulled high, applying +3.5V
to +13 with respect to –Input, pin 1) as per Figure 8. Positive-logic devices
are disabled when pin 2 is pulled low (0 to 0.8V with respect to –Input).
ON/OFF
CONTROL
"N" suffix: Optional Negative-logic devices are off when pin 2 is left open (or
pulled high, applying +3.5V to +13V), and on when pin 2 is pulled low (0 to
0.8V) with respect to –Input as shown in Figure 9.
–VIN
3
Figure 9. Driving the Negative Logic On/Off Control Pin
+VIN
1
2
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically iso-
lated if appropriate). The drive circuit should be able to sink appropriate cur-
rent (see Performance Specifications) when activated and withstand appro-
priate voltage when deactivated. Applying an external voltage to pin 2 when
no input power is applied to the converter can cause permanent damage
to the converter.
13V CIRCUIT
5V CIRCUIT
ON/OFF
CONTROL
–VIN
3
Figure 8. Driving the Positive Logic On/Off Control Pin
Surface-Mount Package ("M" suffix)
DATEL is not exempted from the Laws of Physics. And we do not have magic
solders no one else has. Nevertheless, we have a simple and practical,
straightforward approach that works. We assemble our SMT DC-DC's on
a hightemperature, plastic lead-frame (nylon 46, UL94V-0 rated) using a
high-temperature (+216°C), lead-free alloy (Sn96.2%, Ag2.5%, Cu0.8%,
Sb0.5%). The lead-frame ensures coplanarity (to within 0.004 in.) of the unit's
tin-plated (150 microinches) copper leads and also supports a removable
heat shield.
DATEL's ULQ series SMT DC-DC converters are the only higher-power (to
66W) DC-DC's that can be automatically "pick-and-placed" using standard
vacuum-pickup equipment and subsequently reflowed using high-tempera-
ture, lead-free solder.
Virtually all SMT DC-DC's today are unprotected "open-frame" devices
assembled by their vendors with high-temperature solder (usually Sn96.5/
Ag3.5 with a melting point +221°C) so that you may attach them to your
board using low-temperature solder (usually Sn63/Pb37 with a melting point
of +183°C). Conceptually straightforward, this "stepped" solder approach has
its limitations . . . and is clearly out of step with an industry trending toward
the broad use of lead-free solders. No need to experiment and develop reflow
profiles that ensure the components on their DC-DC never exceed 215-
216°C. If those components get too hot, "double-reflow" could compromise
the reliability of their solder joints. Virtually all these devices demand you
"cool down" the Sn63 profile you are likely using today.
The disposable heat shield, which has a cutaway exposing the package
leads, provides thermal insulation to internal components during reflow and
also doubles as the vacuum pick-up location. The insulation properties of the
heat shield are so effective that temperature differentials as high as 50°C
develop inside-to-outside the shield. Oven temperature profiles with peaks of
250-260°C and dwell times exceeding 2 minutes above 221°C (the melting
point of Sn96.5/Ag3.5) are easily achieved. DATEL's new-generation SMT
units are shipped in stackable, JEDEC-style plastic.
250
200
150
100
50
Heat Shield
Test Board
Air Under Shield
Z1
Z2
Z3
Z4
Z5
Z6
300
Z7
Seconds
100
200
400
500
600
Figure 11. Recommended Solder Profile
(When The Heat-shield Temperature Exceeds +250°C,The Air Within Is 50°C Cooler)
Figure 10. ULQ SMT DC-DC
With Disposable Heat Shield
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MDC_ULQ-15A.E04 Page 8 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 1.5V Models
ULQ-1.5/25-D24 Efficiency vs. Line Voltage and Load Current
ULQ-1.5/25-D24
Output Current vs. Ambient Temperature
(No air flow)
92
90
88
86
84
82
80
78
76
74
72
70
30
25
20
15
10
5
V
IN = 18V
VIN = 18V
VIN = 24V
V
IN = 24V
VIN = 36V
V
IN = 36V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Ambient Temperature (°C)
Load Current (Amps)
ULQ-1.5/15-D48 Efficiency vs. Line Voltage and Load Current
ULQ-1.5/15-D48
Output Current vs. Ambient Temperature
(No air flow)
92
90
88
86
84
82
80
78
76
74
72
70
68
66
18
15
12
9
VIN = 36V
V
IN = 36V
VIN = 48V
V
IN = 48V
6
VIN = 75V
3
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (°C)
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Load Current (Amps)
ULQ-1.5/25-D48 Efficiency vs. Line Voltage and Load Current
ULQ-1.5/25-D48
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
91
89
87
85
83
81
79
77
75
73
30
25
20
15
10
5
0 lfm
V
IN = 36V
100 lfm
V
IN = 48V
200 lfm
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Load Current (Amps)
Ambient Temperature (°C)
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MDC_ULQ-15A.E04 Page 9 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 1.8V Models
ULQ-1.8/15-D48 Efficiency vs. Line Voltage and Load Current
ULQ-1.8/15-D48
Output Current vs. Ambient Temperature
(No air flow)
92
90
88
86
84
82
80
78
76
74
72
70
68
18
15
12
9
VIN = 36V
VIN = 48V
V
IN = 36V
6
V
IN = 48V
VIN = 75V
3
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (°C)
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Load Current (Amps)
ULQ-1.8/25-D24 Efficiency vs. Line Voltage and Load Current
ULQ-1.8/25-D24
92
90
88
86
84
82
80
78
76
74
72
70
68
Output Current vs. Ambient Temperature
(No air flow)
30
25
20
15
10
5
V
IN = 18V
VIN = 18V
VIN = 24V
V
IN = 24V
V
IN = 36V
VIN = 36V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Ambient Temperature (°C)
Load Current (Amps)
ULQ-1.8/25-D48 Efficiency vs. Line Voltage and Load Current
ULQ-1.8/25-D48
92
90
88
86
84
82
80
78
76
74
72
70
68
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
30
25
20
15
10
5
0 lfm
V
IN = 36V
100 lfm
200 lfm
V
IN = 48V
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2.1
4.2 6.25 8.3 10.4 12.5 14.6 16.7 18.75 20.8 22.9 25
Load Current (Amps)
Ambient Temperature (°C)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 10 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 2V Models
ULQ-2/15-D48 Efficiency vs. Line Voltage and Load Current
ULQ-2/15-D48
Output Current vs. Ambient Temperature
(No air flow)
92
90
88
86
84
82
80
78
76
74
72
70
68
18
15
12
9
VIN = 36V
V
IN = 36V
VIN = 48V
6
V
IN = 48V
VIN = 75V
3
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (°C)
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Load Current (Amps)
ULQ-2/25-D24 Efficiency vs. Line Voltage and Load Current
ULQ-2/25-D24
Output Current vs. Ambient Temperature
(No air flow)
92
90
88
86
84
82
80
78
76
74
72
70
30
25
20
15
10
5
V
IN = 18V
VIN = 18V
VIN = 24V
V
IN = 24V
VIN = 36V
V
IN = 36V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Ambient Temperature (°C)
Load Current (Amps)
ULQ-2/25-D48 Efficiency vs. Line Voltage and Load Current
ULQ-2/25-D48
92
90
88
86
84
82
80
78
76
74
72
70
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
30
25
20
15
10
5
0 lfm
V
IN = 36V
100 lfm
200 lfm
V
IN = 48V
V
IN = 75V
0
–40
0
22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Ambient Temperature (°C)
Load Current (Amps)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 11 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 2.5V Models
ULQ-2.5/15-D48 Efficiency vs. Line Voltage and Load Current
ULQ-2.5/15-D48
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
94
92
90
88
86
84
82
80
78
76
74
72
18
15
12
9
Natural Convection
100 lfm
V
IN = 36V
200 lfm
300 lfm
400 lfm
6
V
IN = 48V
3
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Ambient Temperature (°C)
Load Current (Amps)
ULQ-2.5/20-D48 Efficiency vs. Line Voltage and Load Current
ULQ-2.5/20-D48
93
91
89
87
85
83
81
79
77
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
25
20
15
10
5
V
IN = 36V
100 lfm
200 lfm
300 lfm
V
IN = 48V
V
IN = 75V
400 lfm
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2
4
6
8
10
12
14
16
18
20
Load Current (Amps)
Ambient Temperature (°C)
ULQ-2.5/20-D24 Power Dissipation vs. Load Current
11
10
9
8
7
6
5
4
3
2
1
VIN = 36V
V
IN = 24V
V
IN = 18V
2
4
6
8
10
12
14
16
18
20
22
Load Current (Amps)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 12 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 3.3V Models
ULQ-3.3/15-D48
ULQ-3.3/15-D48 Efficiency vs. Line Voltage and Load Current
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
94
90
86
82
78
74
70
18
15
12
9
Natural Convection
100 lfm
V
IN = 36V
200 lfm
300 lfm
400 lfm
6
V
IN = 48V
3
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (°C)
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
Load Current (Amps)
ULQ-3.3/20-D24 Efficiency vs. Line Voltage and Load Current
ULQ-3.3/20-D24
Output Current vs. Ambient Temperature
(VIN = 24V, air flow direction from Input pin to Output pin)
93
91
89
87
85
83
81
79
77
25
20
15
10
5
V
IN = 18V
V
IN = 24V
0 lfm
100 lfm
V
IN = 36V
200 lfm
400 lfm
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2
4
6
8
10
12
14
16
18
20
Ambient Temperature (°C)
Load Current (Amps)
ULQ-3.3/20-D48 Efficiency vs. Line Voltage and Load Current
ULQ-3.3/20-D48
Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
93
91
89
87
85
83
81
79
77
25
20
15
10
5
V
IN = 36V
100 lfm
V
IN = 48V
200 lfm
300 lfm
V
IN = 75V
0
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
2
4
6
8
10
12
14
16
18
20
Ambient Temperature (°C)
Load Current (Amps)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 13 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 5V Models
ULQ-5/15-D48N Efficiency Vs. Line Voltage And Load Current
ULQ-5/15-D48N
Maximum Output Current vs. Ambient Temperature
(VIN = 48V, air flow direction from Input pin to Output pin)
90.0
80.0
70.0
60.0
50.0
40.0
16
15
14
13
12
11
10
9
Vin = 36V
Vin = 48V
100 lfm
Vin = 60V
Vin = 75V
200 lfm
300 lfm
400 lfm
–40
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Ambient Temperature (°C)
Load Current (Amps)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 14 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical Performance Curves, 12V Models
ULQ-12/8-D24N
Efficiency vs. Line Voltage and Load Current @25°C
ULQ-12/8-D24
Maximum Output Current vs. Ambient Temperature
(VIN = 24V, transverse air flow direction from –Output to +Output pin)
95
90
85
80
75
70
9
8
7
6
5
4
3
2
1
0
0 lfm
200 lfm
V
IN = 18V
400 lfm
600 lfm
V
IN = 24V
V
IN = 36V
–40
0
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
0.8
1.6
2.4
3.2
4
4.8
5.6
6.4
7.2
8
Load Current (Amps)
ULQ-12/10-D48N
Efficiency vs. Line Voltage and Load Current @25°C
ULQ-12/10-D48
Output Current vs. Ambient Temperature
95
90
85
80
75
70
(VIN = 48V, air flow direction from Input pin to Output pin)
10.5
10
9.5
9
500 lfm
8.5
8
100 lfm
200 lfm
V
IN = 36V
V
IN = 48V
7.5
7
300 lfm
V
IN = 75V
6.5
6
–40
0
22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90
1
2
3
4
5
6
7
8
9
10
Ambient Temperature (°C)
Load Current (Amps)
ULQ-12/10-D48 Power Dissipation vs. Load Current
19
17
15
13
11
9
VIN = 75V
V
IN = 48V
V
IN = 36V
7
5
3
1
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 15 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
SMT
Lead
For the surface mount versions of the ULQ, use the Recommended SMT Pad
Layout illustration as a starting point to locate pads to mount the converter.
This diagram is for the pads on the mating printed circuit board—it is not
the dimensions of the lead terminals on the converter. Note: the pads are
slightly larger than the lead terminals to accomodate solder wetting and
meniscus. Also, your particular application may require some deviation from
this diagram.
SMT Unit
PCB
0.020
(0.51)
Copper Pad
2.340 (59.44)
1.975 (50.17)
0.183
(4.65)
0.130
(3.30)
*
*
0.150 TYP.
(3.81)
0.020 REF.
(0.51)
* These two pads are for alignment and positioning only.
They are not required for electrical contact.
Recommended SMT Pad Layout
P A R T N U M B E R S T R U C T U R E
U LQ - 3.3 / 20 D48 N M Lx
- C
RoHS-6 Hazardous
Substance Compliant
-
Output
Configuration:
U = Unipolar
Pin Length Option: Through-hole packages only
Quarter-Brick Package
L1 Pin length 0.110 0.010 inches (2.7ꢀ 0.25mm) ➀
Nominal Output Voltage:
1.2,1.5, 1.8, 2, 2.5, 3.3, 5, 12 Volts
L2 Pin length 0.145 0.010 inches (3.68 0.25mm) ➀
Blank is standard pin length
Maximum Rated Output :
Current in Amps
Surface-Mount Package ➁ ➂
Remote On/Off Control Logic
Add "P" for positive logic
(pin 2 open = converter on)
Input Voltage Range:
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Add "N" for negative logic
(pin 2 open = converter off)
Positive logic is standard for D24 models. Nega-
tive logic is standard for D48 models. Alternate
logic may require a special order.
➀ Special quantity order is required; samples available with standard pin length only.
➁ SMT (M) versions not available in sample quantities.
➂ See list on pg. 2 using the C40 SMT package.
➃ Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 16 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
M E C H A N I C A L S P E C I F I C A T I O N S
2.30 (58.4)
A
0.375 MAX.
(9.53)
OVERALL DIMENSIONS :
2.22 (56.4)
A
2.30 (58.4) x 1.45 (36.8) x 0.70 (17.8)
BEFORE REMOVAL OF PROTECTIVE
HEAT SHIELD
PINS 1-3, 5-7:
0.040 0.001
(1.016 0.025)
PINS 4, 8:
0.062 0.001
(1.575 0.025)
0.35
(8.9)
PROTECTIVE
HEAT SHIELD
0.125
(3.2)
PLASTIC STANDOFFS
ARE RELIEVED 0.030 (0.76)
IN SOLDER JOINT AREA
0.125 MIN.
(3.2)
Case C40
0.150
(3.81)
2.00 (50.8)
A
3 Surface-mount Package
4
5
6
See page 16 for the
recommneded pad
layout dimensions.
2
7
8
1
4
3
2
1
0.600
(15.2)
0.110
(2.79)
5
6
0.300
(7.6)
7
8
BOTTOM VIEW
0.600 (15.2)
4 EQ. SP. @ 0.150 (3.81)
0.600
(15.2)
0.300
(7.6)
BOTTOM VIEW
0.600 (15.2)
4 EQ. SP.
Case C37, Through-Hole Package @ 0.150 (3.81)
DOSA-Compatible I/O Connections
Dimensions are in inches (mm) shown for ref. only.
Pin
1
Function P32
+Vin
Pin
5
Function P32
–Sense
Trim
ꢀꢁꢂꢃd ꢄꢅꢆle ꢇꢃoꢈeꢉꢊꢂoꢅ
2
Remote On/Off*
–Vin
6
3
7
+Sense
+Vout
4
–Vout
8
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
*
The Remote On/Off can be provided with either positive ("P" suffix)
or negative ("N" suffix) logic.
Components are shown for reference only.
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.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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
notice.
© 2017 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_ULQ-15A.E04 Page 17 of 17
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