ULQ-5/15-D24PML1-C_技术文档

ULQ Models

www.murata-ps.com

Single Output, Low-Proﬁle, Quarter-Brick

8-25 Amp Isolated DC/DC Converters

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 polarity), 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)

+V^OUT

(8)

+V^IN

(3)

SWITCH

CONTROL

–V^OUT

(4)

–VIN

(1)

–SENSE

(5)

PWM

CONTROLLER

OPTO

ISOLATION

REFERENCE &

ERROR AMP

V

OUT

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

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21 Feb 2011 MDC_ULQ-15A.B03 Page 1 of 16

Typical topology is shown

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.

(Volts)

Range

(Volts)

I^OUT➁

IIN ➃

Pinout)

(Volts)

(mA/A)

(Amps)

Typ.

25

50

45

25

50

70

25

50

70

35

45

50

45

50

95

90

Max.

50

Line

Min.

Typ.

89%

Load ➂

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-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

1.8

2

15

25

15

25

15

25

15

20

15

8

0.125%

0.25%

48

24

48

24

48

24

48

24

48

24

48

24

48

36-75

18-36

36-75

18-36

36-75

18-36

36-75

18-36

36-75

18-36

36-75

18-36

36-75

35/0.5

50/1.8

30/0.9

35/0.6

90/2.2

45/1.1

45/0.6

50/2.4

50/1.2

45/0.9

45/1.2

80/3.1

45/1.6

50/3.5

50/1.7

90/4.4

80/2.9

87%

85.5%

85%

C37, P32

100

75

87.5%

87%

C37, P32

50

87.5%

85.5%

87%

89%

C37, P32

100

50

87.5%

89%

C37, P32

0.125%

0.25%

C37, P32

2

100

55

86%

88%

C37, P32

2

86%

88%

C37, P32

2.5

3.3

5

0.125%

0.25%

88%

89.5%

90.5%

89.5%

90%

C37/C40, P32

75

88.5%

87.5%

88%

100

75

100

130

89%

91%

5

0.1%

89%

91%

12

0.25%

89%

90.5%

90%

10

0.25%

88%

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%.)

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

₁Surface-mount Package

4

5

6

See page 16 for the

recommneded pad

layout dimensions.

2

7

8

3

4

1

2

3

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)

P A R T N U M B E R S T R U C T U R E

DOSA-Compatible I/O Connections

Dimensions are in inches (mm) shown for ref. only.

1

Function P32

–Input*

5

Function P32

–Sense

Third Angle Projection

- C

RoHS-6 compliant

U LQ - 3.3 / 20 D48 N M Lx

-

Output

Conﬁguration

2

Remote On/Off**

+Input*

6

Output Trim

+Sense

3

7

Pin Length Option

Quarter-Brick Package

Nominal Output Voltage

4

–Output

8

+Output

Surface-Mount Package

(see list above)

Tolerances (unless otherwise speciﬁed):

.XX 0.02 (0.5)

.XXX 0.010 (0.25)

Angles 2ꢀ

*

These converters are pin-for-pin/plug-compatible to competitive

units. Other units may use different pin numbering or alternate

outline views. When laying out your PC board, follow the pin

FUNCTION. DOSA designates Pin 1 as +Input and Pin 3 as -Input.

Maximum Rated Output

Remote On/Off Control Polarity

Input Voltage Range

Components are shown for reference only.

** The Remote On/Off can be provided with either positive ("P" sufﬁx)

or negative ("N" sufﬁx) polarity.

See page 16 for complete Part Number Structure.

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21 Feb 2011 MDC_ULQ-15A.B03 Page 2 of 16

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

0.05A²sec 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 I^IN= 6mA max.

On = pulled low to 0-0.8V I^IN= 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

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% V^OUT) ⁽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)}

V^INto 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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21 Feb 2011 MDC_ULQ-15A.B03 Page 3 of 16

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 48V^INmodels 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 48V^INmodels 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

inductance 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

components/circuits and layout as shown in the following two ﬁgures. External

input capacitors (C^INin 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, C^BUSand LBUS simulate a typical dc

voltage bus.Your speciﬁc system conﬁguration may necessitate additional

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.

considerations.

TO

CURRENT

PROBE

OSCILLOSCOPE

3

+INPUT

L

BUS

Start-Up Time

+

–

VIN

C

BUS

CIN

The V^INto 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.

1

–INPUT

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 V^OUTstart-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 V^INto 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 V^INto VOUT and from On/Off

Control to V^OUTis therefore insigniﬁcant.

Input Overvoltage Shutdown

All 24V^INULQ 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.

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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

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 described below.

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.

7

COPPER STRIP

+SENSE

8

+OUTPUT

Short Circuit Condition

RLOAD

SCOPE

C1

C2

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.

4

5

–OUTPUT

–SENSE

COPPER STRIP

C1 = 0.1μF CERAMIC

C2 = 10μF TANTALUM

LOAD 2-3 INCHES (51-76mm) FROM MODULE

Figure 3. Measuring Output Ripple/Noise (PARD)

F E A T U R E S A N D O P T I O N S

Floating Outputs

Remote Sense

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.

Note: The Sense and V^OUTlines 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 +V^OUTand -Sense to –VOUT at the

DC/DC converter pins.

Minimum Output Loading Requirements

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.

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.

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.

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:

[V^OUT(+) –VOUT(–)] – [Sense(+) –Sense (–)] ≤ 10% VOUT

Output Overvoltage Protection

Contact and PCB resistance

losses due to IR drops

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.

8

1

+OUTPUT

–INPUT

IOUT

7

+SENSE

Sense Current

2

3

ON/OFF

CONTROL

6

5

TRIM

–SENSE

LOAD

Sense Return

IOUT Return

4

+INPUT

–OUTPUT

Contact and PCB resistance

losses due to IR drops

Current Limiting

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-

Figure 4. Remote Sense Circuit Conﬁguration

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21 Feb 2011 MDC_ULQ-15A.B03 Page 5 of 16

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 V^OUTand 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 V^OUTand 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:

(V^OUTat 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.

(V^OUTat 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

–10.2

R^T_UP(kΩ) =

RT_DOWN(kΩ) =

8

1

+OUTPUT

–INPUT

1.2 – VO

7

ULQ-1.5/15-D48, ULQ-1.5/25-D24 & D48

+SENSE

6.23(VO – 1.226)

7.64

1.5 – V^O

6

5

4

2

3

5-22

TURNS

ON/OFF

CONTROL

–10.2

RT_DOWN(kΩ) =

TRIM

–SENSE

LOAD

VO – 1.5

ULQ-1.8/15-D48, ULQ-1.8/25-D24 & D48

9.12

1.8 – V^O

+INPUT

7.44(VO – 1.226)

–OUTPUT

–10.2

RT_DOWN(kΩ) =

VO – 1.8

Figure 5.Trim Connections Using A Trimpot

ULQ-2/15-D48, ULQ-2/15-D24 & D48

10.15

2 – V^O

8.28(VO – 1.226)

8

1

+OUTPUT

–INPUT

–10.2

RT_DOWN(kΩ) =

R^T_UP(kΩ) =

VO – 2

7

+SENSE

ULQ-2.5/15-D48, ULQ-2.5/20-D24 & D48

2

3

6

5

4

ON/OFF

CONTROL

10(VO – 1.226)

VO – 2.5

12.26

2.5 – V^O

TRIM

–SENSE

LOAD

–10.2

RT_DOWN(kΩ) =

R^{TRIM UP}

ULQ-3.3/15-D48, ULQ-3.3/20-D24 & D48

+INPUT

–OUTPUT

16.31

13.3(VO – 1.226)

–10.2

RT_DOWN(kΩ) =

R^T_UP(kΩ) =

3.3 – V^O

VO – 3.3

Figure 6.Trim Connections To Increase Output Voltages Using Fixed Resistors

ULQ-5/15-D24, -D48

8

1

+OUTPUT

–INPUT

25.01

20.4(VO – 1.226)

VO – 5

–10.2

RT_DOWN(kΩ) =

5 – V^O

7

+SENSE

ULQ-12/8-D24, ULQ-12/10-D48

2

3

6

5

4

ON/OFF

CONTROL

TRIM

–SENSE

LOAD

60.45

49.6(VO – 1.226)

R^{TRIM DOWN}

–10.2

RT_DOWN(kΩ) =

12 – V^O

VO – 12

+INPUT

–OUTPUT

Note: Resistor values are in kΩ. Adjustment accuracy is subject to resistor

tolerances and factory-adjusted output accuracy. V^O= desired output voltage.

Figure 7.Trim Connections To Decrease Output Voltages Using Fixed Resistors

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21 Feb 2011 MDC_ULQ-15A.B03 Page 6 of 16

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 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 (%)

Model ULQ-3.3

Model ULQ-1.8

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 (%)

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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21 Feb 2011 MDC_ULQ-15A.B03 Page 7 of 16

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 polarity:

+INPUT

3

+V^CC

"P" sufﬁx: Standard models are equipped with Positive-polarity 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-polarity devices

are disabled when pin 2 is pulled low (0 to 0.8V with respect to –Input).

2

ON/OFF

CONTROL

"N" sufﬁx: Optional Negative-polarity 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.

–INPUT

1

Figure 9. Driving the Negative Polarity On/Off Control Pin

+INPUT

3

2

13V CIRCUIT

5V CIRCUIT

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.

ON/OFF

CONTROL

–INPUT

1

Figure 8. Driving the Positive Polarity 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

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.

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 melt-

ing 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.

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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21 Feb 2011 MDC_ULQ-15A.B03 Page 8 of 16

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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21 Feb 2011 MDC_ULQ-15A.B03 Page 9 of 16

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)

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21 Feb 2011 MDC_ULQ-15A.B03 Page 10 of 16

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

(V^IN= 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)

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21 Feb 2011 MDC_ULQ-15A.B03 Page 11 of 16

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)

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21 Feb 2011 MDC_ULQ-15A.B03 Page 12 of 16

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)

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21 Feb 2011 MDC_ULQ-15A.B03 Page 13 of 16

ULQ Models

Single Output, Low-Proﬁle, Quarter-Brick

8-25 Amp Isolated DC/DC Converters

Typical Performance Curves, 5V Models

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6IN ꢀ ꢍꢊ6

ꢅꢋꢋ LFM

ꢁꢋꢋ LFM

ꢆꢋꢋ LFM

nꢆꢋ

ꢋ

ꢅꢊ ꢁꢋ ꢁꢊ ꢆꢋ ꢆꢊ ꢊꢋ ꢊꢊ ꢂꢋ ꢂꢊ ꢍꢋ ꢍꢊ ꢄꢋ ꢄꢊ ꢌꢋ ꢌꢊ ꢃꢋꢋ

ꢀꢊꢆ

ꢈ

ꢇꢊꢆ

ꢅ

ꢄꢊꢆ

ꢂ

ꢀꢁꢊꢆ

ꢀꢉ

ꢀꢈꢊꢆ

ꢀꢆ

!MBIENT 4EMPERATURE ꢇo#ꢈ

,OAD #URRENT ꢇ!MPSꢈ

www.murata-ps.com

email: sales@murata-ps.com

21 Feb 2011 MDC_ULQ-15A.B03 Page 14 of 16

ULQ Models

Single Output, Low-Proﬁle, Quarter-Brick

8-25 Amp Isolated DC/DC Converters

Typical Performance Curves, 12V Models

5,1ꢀꢉꢁꢄꢊꢀ$ꢁꢆ.

%FFICIENCY VSꢂ ,INE 6OLTAGE AND ,OAD #URRENT ꢁꢃ#

5,1ꢀꢉꢁꢄꢊꢀ$ꢁꢆ

-AXIMUM /UTPUT #URRENT VSꢂ !MBIENT 4EMPERATURE

ꢇ6). ꢀ ꢅꢆ6ꢈ TRANSVERSE AIR FLOW DIRECTION FROM n/UTPUT TO ꢏ/UTPUT PINꢉ

ꢂꢆ

ꢂꢁ

ꢃꢆ

ꢃꢁ

ꢄꢆ

ꢄꢁ

ꢌ

ꢄ

ꢍ

ꢂ

ꢊ

ꢆ

ꢁ

ꢅ

ꢃ

ꢋ

ꢋ LFM

ꢅꢋꢋ LFM

6

). ꢀ ꢃꢄ6

ꢆꢋꢋ LFM

ꢂꢋꢋ LFM

6

). ꢀ ꢅꢆ6

6

). ꢀ ꢁꢂ6

nꢆꢋ

ꢋ

ꢅꢊ

ꢁꢋ

ꢁꢊ

ꢆꢋ

ꢆꢊ

ꢊꢋ

ꢊꢊ

ꢂꢋ

ꢂꢊ

ꢍꢋ

ꢍꢊ

ꢄꢋ

ꢄꢊ

ꢌꢋ

!MBIENT 4EMPERATURE ꢇo#ꢈ

ꢁꢊꢃ

ꢀꢊꢅ

ꢉꢊꢇ

ꢈꢊꢉ

ꢇ

ꢇꢊꢃ

ꢆꢊꢅ

ꢅꢊꢇ

ꢄꢊꢉ

ꢃ

,OAD #URRENT ꢇ!MPSꢈ

5,1ꢀꢉꢁꢄꢉꢅꢀ$ꢆꢊ.

%FFICIENCY VSꢂ ,INE 6OLTAGE AND ,OAD #URRENT ꢁꢃ#

ULQ-12/10-D48

Output Current vs. Ambient Temperature

ꢂꢆ

ꢂꢁ

ꢃꢆ

ꢃꢁ

ꢄꢆ

ꢄꢁ

(V^IN= 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

6

). ꢀ ꢁꢂ6

6

). ꢀ ꢆꢄ6

7.5

7

300 lfm

6

). ꢀ ꢍꢊ6

6.5

6

–40

0

22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90

ꢀ

ꢉ

ꢈ

ꢇ

ꢆ

ꢅ

ꢄ

ꢃ

ꢂ

ꢀꢁ

Ambient Temperature (°C)

,OAD #URRENT ꢇ!MPSꢈ

5,1ꢀꢉꢁꢄꢉꢅꢀ$ꢆꢊ 0OWER $ISSIPATION VSꢂ ,OAD #URRENT

ꢀꢂ

ꢀꢄ

ꢀꢆ

ꢀꢈ

ꢀꢀ

ꢂ

6

). ꢀ ꢍꢊ6

6

). ꢀ ꢆꢄ6

6

). ꢀ ꢁꢂ6

ꢄ

ꢆ

ꢈ

ꢀ

ꢉ

ꢈ

ꢇ

ꢆ

ꢅ

ꢄ

ꢃ

ꢂ

ꢀꢁ

,OAD #URRENT ꢇ!MPSꢈ

www.murata-ps.com

email: sales@murata-ps.com

21 Feb 2011 MDC_ULQ-15A.B03 Page 15 of 16

ULQ Models

Single Output, Low-Proﬁle, Quarter-Brick

8-25 Amp Isolated DC/DC Converters

3-4

,EAD

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.

3-4 5NIT

0#"

ꢋꢐꢋꢅꢋ

ꢇꢋꢐꢊꢃꢉ

#OPPER 0AD

ꢅꢐꢁꢆꢋ ꢇꢊꢌꢐꢆꢆꢉ

ꢃꢐꢌꢍꢊ ꢇꢊꢋꢐꢃꢍꢉ

ꢋꢐꢃꢄꢁ

ꢇꢆꢐꢂꢊꢉ

ꢋꢐꢃꢁꢋ

ꢇꢁꢐꢁꢋꢉ

ꢑ

ꢋꢐꢃꢊꢋ 49 ꢐ

ꢇꢁꢐꢄꢃꢉ

ꢋꢐꢋꢅꢋ 2%&ꢐ

ꢇꢋꢐꢊꢃꢉ

ꢑ 4HESE TWO PADS ARE FOR ALIGNMENT AND POSITIONING ONLYꢐ

4HEY ARE NOT REQUIRED FOR ELECTRICAL CONTACTꢐ

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

Note: Standard pin length with no

Pin Length Option: Through-hole packages only

L1 Pin length 0.110 0.010 inches (2.79 0.25mm)

L2 Pin length 0.145 0.010 inches (3.68 0.25mm)

Blank is standard pin length

"Lx" sufﬁx is 0.125" (3.18mm). The

L1 and L2 lengths require a sched-

uled quantity order.

Quarter-Brick Package

Nominal Output Voltage:

1.2,1.5, 1.8, 2, 2.5, 3.3, 5, 12 Volts

Maximum Rated Output :

Current in Amps

Surface-Mount Package*

Note:

Some model number combinations

may not be available. Contact Murata

Power Solutions.

Remote On/Off Control Polarity

Add "P" for positive polarity

(pin 2 open = converter on)

Input Voltage Range:

D24 = 18-36 Volts (24V nominal)

D48 = 36-75 Volts (48V nominal)

Add "N" for negative polarity

(pin 2 open = converter off)

Positive polarity is standard for D24 models.

Negative polarity is standard for D48 models.

Alternate polarities may require a special order.

*See list on pg. 2 using the C40 SMT package.

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.

www.murata-ps.com/locations

email: sales@murata-ps.com

21 Feb 2011 MDC_ULQ-15A.B03 Page 16 of 16


型号：	ULQ-5/15-D24PML1-C
厂家：	muRata
描述：	DC-DC Regulated Power Supply Module, 1 Output, 75W, Hybrid, ROHS COMPLIANT, QUARTER BRICK, SMT-8
文件：	总16页 (文件大小：338K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ULQ-5/15-D24PML1-C [MURATA]

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