ULS-15/2-D48NM-C_技术文档

ULS Series

www.murata-ps.com

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

FEATURES

ꢀSmall footprint DC/DC converter, ideal for

high current applications

ꢀTiny 0.9" x 1.3" x 0.40" open frame package

Typical unit

ꢀIndustry standard DOSA "brick" format

and pinout

PRODUCT OVERVIEW

ꢀ36-75 Volts DC input range

The world of “brick” DC/DC converters has seen

a steady size reduction. The ULS series makes

another dramatic size shrink down to a “sixteenth- On/Off control may use a switch, transistor or digital

brick” width (0.9 inches) while still retaining a

66 Watt output and full 2250 Volt DC isolation.

The PC-board mount converter family accepts

minimum load is required. For systems requiring

controlled startup/shutdown, an external remote

ꢀ2250 Volt Basic input/output isolation

(48V models)

ꢀUp to 66 Watts total output power with

overtemperature shutdown

logic. Remote Sense inputs compensate for resis-

tive line drops at high currents.

Many self-protection features on the ULS series

ꢀHigh efﬁciency synchronous rectiﬁer forward

topology

36 to 75 Volts DC inputs and delivers ﬁxed outputs avoid both converter and external circuit hazards.

regulated to within 0.2ꢀ. The ULS converters

are ideal for datacom and telecom applications,

cell phone towers, data centers, server farms and

network repeaters.

ULS outputs may be trimmed within 10ꢀ of

nominal output while delivering fast settling to

current step loads and no adverse effects from

higher capacitive loads. Excellent ripple and noise

speciﬁcations assure compatibility to circuits using

CPU’s, ASIC’s, programmable logic and FPGA’s. No

These include input undervoltage lockout and

overtemperature shutdown. The outputs current

limit using the “hiccup” autorestart technique and

the outputs may be short-circuited indeﬁnitely.

Additional features include output overvoltage and

reverse conduction elimination.

The synchronous rectiﬁer forward topology yields

high efﬁciency for minimal heat buildup and “no

fan” operation.

ꢀStable no-load operation with no required

external components

ꢀOperating temperature range -40 to +85°C

with derating

ꢀUL 60950-1, CSA-C22.2 No. 234,

EN60950-1 safety approvals, 2nd Edition

(pending)

ꢀExtensive self-protection shut down features

SIMPLIFIED BLOCK DIAGRAM

+SENSE

(7)

+Vin

(1)

+Vout

(8)

SWITCH

CONTROL

-Vout

(4)

-Vin

(3)

PULSE

TRANSFORMER

-SENSE

(5)

INPUT

UNDER VOLTAGE,

OVER TEMPERATURE,

AND OUTPUT

OVER VOLTAGE

COMPARATORS

PWM

CONTROLLER

OPTO

ISOLATION

REFERENCE

ERROR AMP

Vout

TRIM

(6)

REMOTE

ON/OFF

CONTROL

(2)

Typical topology is shown

Figure 1. Simpliﬁed Block Diagram

For full details go to

www.murata-ps.com/rohs

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 1 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

ꢀ

PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE

Output

Input

VIN Nom. Range IIN, no load

C76

Package

Efﬁciency

Root Model ꢀ

R/N (mV pk-pk) ꢁ Regulation (max.) ꢂ

VOUT

I^OUT

Power

IIN, full

(V)

(A, max.) (W)

(V)

(mA)

load (A)

Typ.

70

Max.

120

80

Line

Load

Min. Typ. Case (inches)

89ꢀ 90ꢀ 0.9x1.3x0.40

88ꢀ 90ꢀ 0.9x1.3x0.40

88ꢀ 91ꢀ 0.9x1.3x0.40

0.9x1.3x0.40

ULS-3.3/20-D48N-C

ULS-5/12-D48N-C

ULS-12/5-D48N-C

ULS-15/2-D48N-C

ULS-12/2.5-D48N-C

3.3

5

20

12

5

66

60

0.1ꢀ

0.2ꢀ

48

36-75

20

40

50

1.53

1.39

1.37

50

0.125ꢀ

0.25ꢀ

12

15

12

80

120

2

PRELIMINARY – Please contact Murata Power Solutions for further information.

2.5

0.9x1.3x0.40

ꢀ

ꢁ

ꢃ

Please refer to the Part Number Structure when ordering.

These speciﬁcations are preliminary. Contact Murata Power Solutions for availability.

All speciﬁcations are at nominal line voltage and full load, +25°C unless otherwise noted. See detailed ➄ Models ULS-12/2.5-D48N-C and ULS-15/2-D48N-C do not include sense pins.

speciﬁcations. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF electrolytic.

I/O caps are necessary for our test equipment and may not be needed for your application.

➃ Regulation speciﬁcations describe output voltage deviations from a nominal/midpoint value to either

extreme (50% load step).

PART NUMBER STRUCTURE

ULS - 3.3 / 20 - D48 N H Lx - C

RoHS Hazardous Substance Compliance

(does not claim EU RoHS exemption 7b–lead in solder)

C = RoHS-6

Y = RoHS-5

Sixteenth Brick Series

Pin Length Option (Thru-hole only)

Blank = Standard pin length 0.180˝ (4.6mm)

L1 = 0.110˝ (2.79mm)

L2 = 0.145˝ (3.68mm)

Nominal Output Voltage:

Conformal Coating:

Blank = No coating, standard

H = Coating added, optional special order

Maximum Rated Output Current

Current in Amps

Note:

Some model number combinations

may not be available. Contact Murata

Power Solutions.

On/Off Control Polarity:

N = Negative, standard

P = Positive, optional special order

Input Voltage Range:

D48 = 36-75 Volts (48V nominal)

DC/DC Converter

+ Vin

Preferred location

of On/Off control

adjacent to -Vin

terminal

On/Off Enable Control Ground Bounce Protection

To improve reliability, if you use a small signal transistor or other external

circuit to select the Remote On/Off control, make sure to return the LO side

directly to the –Vin power input on the DC/DC converter. To avoid ground

bounce errors, do not connect the On/Off return to a distant ground plane or

current-carrying bus. If necessary, run a separate small return wire directly to

the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off

control however, large current changes on a return ground plane or ground

bus can accidentally trigger the converter on or off. If possible, mount the On/

Off transistor or other control circuit adjacent to the converter.

On/Off Enable

-Vin return

On/Off

Control

Transistor

Ground plane or power return bus

Install separate

return wire for

On/Off control

with remote

transistor

Do not connect

control transistor

through remote

power bus

Figure 2. On/Off Enable Control Ground Bounce Protection

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 2 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MECHANICAL SPECIFICATIONS

BOTTOM PIN SIDE VIEW

1.30

3

4

5

END VIEW

2

6

7

8

1

INPUT/OUTPUT CONNECTIONS P75

Function

Negative Input

4

Function

Negative Output

–Sense In*

Trim

3

SIDE VIEW

5

2

1

On/Off Control

Positive Input

6

7

+Sense In*

Positive Output

8

PINS 1-3,5-7:

φ0.040 0.001ꢀ1.016 0.025ꢁ

1.100

Important! Always connect the sense pins. If they

are not connected to a remote load, wire each

sense pin to its respective voltage output at the

converter pins.

PINS 4,8:

φ0.062 0.001ꢀ1.575 0.025ꢁ

* Models ULS-12/2.5-D48N-C and ULS-15/2-D48N-C do

not include sense pins.

The 0.145-inch pin length is shown. Please refer to the

part number structure for alternate pin lengths.

Pin material: Copper alloy. Plating: Gold over nickel

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

TOP VIEW

Third Angle Projection

Tolerances (unless otherwise speciﬁed):

.XX 0.02 (0.5)

.XXX 0.010 (0.25)

Angles 2ꢁ

Components are shown for reference only

and may vary between units.

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 3 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

Absolute Maximum Ratings

Output, continued

Input Voltage

Efﬁciency

See Ordering Guide

Maximum Capacitive Loading (Low 1000μF max. (ULS-3.3 &-5)

Continuous

+75 Volts

ESR > 0.02 Ω min., resistive load)

Isolation Voltage

Input to Output

2000μF (ULS-12/2.5)

Transient (100 mS)

On/Off Control

Input Reverse Polarity Protection

+100 Volts

0 V. min to +15 V. max.

None, install external fuse

Current-limited. Devices can withstand

sustained short circuit without damage.

2250 Vdc min.

Isolation Resistance

10 Megohms min.

1000 pF

Basic insulation

26 Amps (ULS-3.3/20-D48, ULS-5/12-D48)

Output Current

Isolation Capacitance

Isolation Safety Rating

Current Limit Inception

Storage Temperature

Lead Temperature

–55 to +125°C

See soldering guidelines

(13)

(97ꢀ of V^OUTsetting, after warmup) 6.8 Amps (ULS-12/5-D48)

3.5 Amps (ULS-12/2.5)

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.

(5)

Short Circuit

Current limiting with hiccup autorestart.

Protection Method

Remove overload for recovery.

6.6 Amps (ULS-3.3/20-D48)

0.5 Amps (ULS-5/12-D48)

0.6 Amps (ULS-12/5-D48)

Performance/Functional Speciﬁcations

Short Circuit Current

Typical at TA = +25°C under nominal line voltage, nominal output voltage, natural air

convection, 1 μF || 10 μF output external caps, 22μF low ESR input external cap and

full-load conditions unless otherwise noted.⁽¹⁾

0.04 Amps (ULS-12/2.5)

Continuous, output shorted to ground (no

damage)

Input

Input Voltage Range

Start-up Threshold

See Ordering Guide

34.5 Volts (ULS-3.3 & -5)

33.5 Volts (ULS-12/2.5)

32.5 Volts

None

20 mA pk-pk

Short Circuit Duration

Overvoltage Protection

via Magnetic feedback

4.29 Volts (ULS-3.3/20-D48)

6.5 Volts (ULS-5/12-D48)

14.5 Volts (ULS-12/5-D48)

15 Volts (ULS-12/2.5)

(12)

Undervoltage Shutdown

Overvoltage Shutdown

Reﬂected (Back) Ripple Current

Input Current

Full Load Conditions

Inrush Transient

Output Short Circuit Current

Low Line (V^IN= Vmin.)

(2)

150 μSec to 1ꢀ of ﬁnal value

(ULS-3.3/20-D48)

Dynamic Load Response

See Ordering Guide

0.05 A²Sec.

100 mA

2.08 Amps (ULS-3.3/20-D48)

1.85 Amps (ULS-5/12-D48)

1.83 Amps (ULS-12/5-D48)

0.95 Amps (ULS-12/2.5)

25-50-25 μSec to 1ꢀ of ﬁnal value

(ULS-5/12-D48, ULS-12/5-D48)

(50-75ꢀ load step)

Start-Up Time

5 mSec (ULS-3.3/20-D48)

10 mSec (ULS-5/12-D48)

30 mSec (ULS-12/5-D48)

400-520 kHz (ULS-3.3 & -5)

260-310 kHz (ULS-12/2.5)

The converter will start if the external load

pre-bias does not exceed Vnominal

V^INon to VOUT regulated

Remote On/Off to VOUT regulated

Switching Frequency

Standby Mode(Off, UV, OT shut-

down)

Internal Input Filter Type

5 mA

Capacitive

Pre-Bias Load Startup

Recommended External

Fast Blow Fuse

10 Amps (ULS-3.5 & -5)

2 Amps (ULS-12/2.5)

Environmental

Calculated MTBF⁽⁴⁾

Operating Temperature Range

With derating

Storage Temperature Range

Thermal Protection/Shutdown

3.2M Hours

Reverse Polarity Protection

Remote On/Off Control

None, install external fuse

–40 to +85°C⁽¹¹⁾

See Derating Curves

–55 to +125°C

(6)

Positive Logic ("P" model sufﬁx)

Negative Logic ("N" model sufﬁx)

Current, mA

Off = ground pin to +1.0 V Max

On = open pin or + 10 V min. to +15 V Max

Off = open pin or +2.5 V min. to +15 V Max

On = -0.1 V to +0.8 V Max

1-5

+110-130°C (hot spot)

Relative Humidity (non-condensing) to +85ꢀRH/+85°C

Physical

See Mechanical Speciﬁcations

Gold-plated copper alloy with nickel

underplate

Outline Dimensions

Pin Material

Out

Output

See Ordering Guide

(3)(15)

Voltage Output Range

Pin Diameter

Voltage Output Accuracy

Adjustment Range

1ꢀ of Vnominal

(Pins 1-3, 5-7)

(Pins 4 & 8)

Weight

0.04" (1.02mm)

0.062" (1.58mm)

0.58 ounce (16.4 grams)

EN55022/CISPR22 (requires external ﬁlter)

(8)

-10ꢀ to +10ꢀ of Vnominal (ULS-3.3 &-5)

-20ꢀ to +10ꢀ (ULS-12/2.5)

0.02ꢀ of Vout range per °C

No minimum load

10ꢀ max. of Vset ⁽¹⁸⁾

See Ordering Guide

Temperature Coefﬁcient

Minimum Loading

Remote Sense Compensation

Ripple/Noise (20 MHz bandwidth)

Electromagnetic Interference

UL/cUL 60950-1, CSA-C22.2 No.234,

IEC/EN 60950-1, 2nd Edition

Safety (designed to meet)

Flammability Rating

(9)(14)

UL94V-0 (designed to meet)

(7)

Line/Load Regulation

See Ordering Guide

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 4 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

Performance Speciﬁcation Notes

8. Do not exceed maximum power ratings, Sense limits or output overvoltage

1. All speciﬁcations are typical unless noted. Ambient temperature =

+25°Celsius, V^INis nominal, output current is maximum rated nominal.

External output capacitance is 1 μF multilayer ceramic paralleled with

10 μF electrolytic. All caps are low ESR. These capacitors are necessary for

our test equipment and may not be needed in your application.

Testing must be kept short enough that the converter does not appreciably

heat up during testing. For extended testing, use plenty of airﬂow. See

Derating Curves for temperature performance. All models are stable and

regulate within spec without external cacacitance.

when adjusting output trim values.

9. At zero output current, Vout may contain components which slightly

exceed the ripple and noise speciﬁcations.

10. Output overload protection is non-latching. When the output overload

is removed, the output will automatically recover.

11. All models are fully operational and meet published speciﬁcations,

including “cold start” at –40°C.

12. The converter will shut off if the input falls below the undervoltage thresh-

old. It will not restart until the input exceeds the Input Start Up Voltage.

2. Input Ripple Current is tested and speciﬁed over a 5-20 MHz bandwidth

and uses a special set of external ﬁlters only for the Ripple Current speci-

ﬁcations. Input ﬁltering is C^IN= 33 μF, CBUS = 220 μF, LBUS = 12 μH. Use

capacitor rated voltages which are twice the maximum expected voltage.

Capacitors must accept high speed AC switching currents.

13. Short circuit shutdown begins when the output voltage degrades approxi-

mately 2ꢀ from the selected setting.

14. Output noise may be further reduced by installing an external ﬁlter. See

the Application Notes. Use only as much output ﬁltering as needed and no

more. Larger caps (especially low-ESR ceramic types) may slow transient

response or degrade dynamic performance. Thoroughly test your applica-

tion with all components installed.

3. Note that Maximum Current Derating Curves indicate an average current

at nominal input voltage. At higher temperatures and/or lower airﬂow, the

converter will tolerate brief full current outputs if the average RMS current

over time does not exceed the Derating curve. All Derating curves are

presented at sea level altitude. Be aware of reduced power dissipation

with increasing density altitude.

15. To avoid damage or unplanned shutdown, do not sink appreciable reverse

output current.

16. If reverse polarity is accidentally applied to the input, to ensure reverse

input protection with full output load, always connect an external fast blow

input fuse in series with the +V^INinput.

4. Mean Time Before Failure (MTBF) is calculated using the Telcordia

(Belcore) SR-332 Method 1, Case 3, Issue 1, ground ﬁxed conditions. Oper-

ating temperature = +30°C, full output load, natural air convection.

17. Although extremely unlikely, failure of the internal components of this

product may expose external application circuits to dangerous voltages,

currents, temperatures or power levels. Please thoroughly verify all appli-

cations before committing them to service. Be sure to include appropri-

ately-rated FUSES (see speciﬁcations and Application Notes) to reduce the

risk of failure.

5. The output may be shorted to ground indeﬁnitely with no damage. The

Output Short Circuit Current shown in the speciﬁcations is an average con-

sisting of very short bursts of full rated current to test whether the output

circuit can be repowered.

6. The On/Off Control is normally driven from a switch or relay. An open

collector/open drain transistor may be used in saturation and cut-off

(pinch-off) modes. External logic may also be used if voltage levels are

fully compliant to the speciﬁcations.

18. Models ULS-12/2.5-D48 and ULS-15/2-D48 do not include sense pins.

7. Regulation speciﬁcations describe the deviation as the input line voltage

or output load current is varied from a nominal midpoint value to either

extreme (50ꢀ load).

Soldering Guidelines

Murata Power Solutions recommends the speciﬁcations below when installing these converters. These speciﬁcations vary depending on the solder type. Exceeding these speciﬁca-

tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.

Wave Solder Operations for through-hole mounted products (THMT)

For Sn/Ag/Cu based solders:

For Sn/Pb based solders:

Maximum Preheat Temperature 115° C.

Maximum Preheat Temperature 105° C.

Maximum Pot Temperature

Maximum Solder Dwell Time

270° C.

Maximum Pot Temperature

250° C.

7 seconds Maximum Solder Dwell Time

6 seconds

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 5 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

Input Fusing

I/O Filtering, Input Ripple Current, and Output Noise

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 ULS series DC/DC converters, we recommend the

use of a fast blow fuse, installed in the ungrounded input supply line with a

typical value about twice the maximum input current, calculated at low line

with the converter’s minimum efﬁciency.

All models in the ULS 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 capaci-

tors (C^INin Figure 3) serve primarily as energy-storage elements, minimiz-

ing 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 sta-

bility. In Figure 3, C^BUSand LBUS simulate a typical dc voltage bus. Your speciﬁc

system conﬁguration may necessitate additional considerations.

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, i.e. IEC/EN/UL60950-1.

TO

Input Reverse-Polarity Protection

CURRENT

PROBE

OSCILLOSCOPE

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 appropriately fused, it

could cause permanent damage to the converter.

+INPUT

–INPUT

LBUS

+

V

IN

CBUS

CIN

–

Input Under-Voltage 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

Under-Voltage 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.

C

IN = 33μF, ESR < 700m7 @ 100kHz

BUS = 220μF, ESR < 100m7 @ 100kHz

C

L

BUS = 12μH

Figure 3. Measuring Input Ripple Current

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. They function as true ﬁlter elements and should be selected

for bulk capacitance, low ESR and appropriate frequency response.

Start-Up Time

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 ULS Series implements a soft start circuit to limit the duty cycle

of its PWM controller at power up, thereby limiting the input inrush current.

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.

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. Similar to the V^INto VOUT start-up, the On/Off

Control to V^OUTstart-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.

In Figure 4, 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.

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.

Input Source Impedance

The input of ULS 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 3 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.

Minimum Output Loading Requirements

ULS 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.

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 6 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated 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 +V^OUTand –Sense to –VOUT at the DC/

DC converter pins. ULS series converters employ a sense feature to provide

point of use regulation, thereby overcoming moderate IR drops in PCB conduc-

tors 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.

COPPER STRIP

+SENSE

+OUTPUT

R

LOAD

SCOPE

C1

C2

–OUTPUT

–SENSE

COPPER STRIP

C1 = 1μF CERAMIC

C2 = 10μF TANTALUM

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

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

Figure 4. Measuring Output Ripple/Noise (PARD)

Thermal Shutdown

In cables and discrete wiring applications, twisted pair or other techniques

should be used. Output over-voltage protection is monitored at the output volt-

age 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 Speci-

ﬁcations for over-voltage limits). Power derating is based on maximum output

current and voltage at the converter’s output pins. Use of trim and sense func-

tions 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 over-voltage region. Therefore, the designer must ensure:

The ULS converters are equipped with thermal-shutdown circuitry. If environ-

mental 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 Over-Voltage Protection

The ULS output voltage is monitored for an over-voltage condition using a com-

parator. The signal is optically coupled to the primary side and if the output volt-

age rises to a level which could be damaging to the load, the sensing 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 over-voltage circuitry will initiate

another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.

(V^OUTat pins) x (IOUT) ꢀ rated output power

Contact and PCB resistance

losses due to IR drops

+OUTPUT

–INPUT

IOUT

+SENSE

Current Limiting

Sense Current

ON/OFF

CONTROL

As soon as the output current increases to approximately 130ꢀ of its rated

value, the DC/DC converter will go into a current-limiting mode. In this condi-

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.

TRIM

–SENSE

LOAD

Sense Return

IOUT Return

+INPUT

–OUTPUT

Contact and PCB resistance

losses due to IR drops

Figure 5. Remote Sense Circuit Conﬁguration

Short Circuit Condition

On/Off Control

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 mag-

netically 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 appropri-

ate 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 ULS Series is capable of enduring an indeﬁ-

nite short circuit output condition.

The input-side, remote On/Off Control function can be ordered to operate with

either polarity:

Positive ("P" sufﬁx) polarity models are enabled when the on/off pin is left

open (or is pulled high, applying +3.5V to +13.5V with respect to –Input) as per

Figure 6. Positive-polarity devices are disabled when the on/off pin is pulled

low (0 to 0.8V with respect to –Input).

Negative (“N” sufﬁx) polarity devices are off when pin is left open (or pulled

high, applying +3.5V to +13.5V), and on when pin is pulled low (0 to 1V) with

respect to –Input as shown in Figure 10.

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 7 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

Dynamic control of the remote on/off function is best accomplished with a

mechanical relay or an open-collector/open-drain drive circuit (optically isolated

if appropriate). The drive circuit should be able to sink appropriate current (see

Performance Speciﬁcations) when activated and withstand appropriate 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.

+INPUT

+Vcc

13V CIRCUIT

ON/OFF

CONTROL

5V CIRCUIT

–INPUT

Figure 6. Driving the Negative Polarity On/Off Control Pin

(simpliﬁed circuit)

OUTPUT VOLTAGE ADJUSTMENT

Trim Equations

Trim Down

5.11

+OUTPUT

–INPUT

RT _DOWN(kꢁ) =

– 10.22

+SENSE

TRIM

Δ

VOUT – VNOM

Where Δꢂꢃꢂꢄꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂ ꢄ

ON/OFF

CONTROL

LOAD

VNOM

R^{TRIM UP}

Trim Up

–SENSE

–OUTPUT

5.11 × VNOM x (1 + Δ)

1.225 × Δ

5.11

Δ

– 10.22

–

RT _UP(kꢁ) =

+INPUT

VOUT – VNOM

Where Δꢂꢃꢂꢄꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂꢂ ꢄ

Figure 3.Trim Connections To Increase Output Voltages

VNOM

Connect sense to its respective VOUT pin if sense is not used with a remote load.

Note: “Δ” is always a positive value.

“V^NOM” is the nominal, rated output voltage.

“V^OUT” is the desired, changed output voltage.

+OUTPUT

–INPUT

+SENSE

R^{TRIM DOWN}

ON/OFF

CONTROL

TRIM

–SENSE

LOAD

+INPUT

–OUTPUT

Figure 4.Trim Connections To Decrease Output Voltages

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 8 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES, ULS-3.3/20-D48

Efﬁciency vs. Line Voltage and Load Current @ 25°C

Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, longitudinal airﬂow)

25

20

15

10

5

100

95

90

Natural convection

100 LFM

85

200 LFM

300 LFM

400 LFM

VIN = 75V

V^IN= 48V

V^IN= 36V

80

75

70

65

60

0

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature (ºC)

3

4

6

8

10

12

14

16

18

20

Load Current (Amps)

TYPICAL PERFORMANCE CURVES, ULS-5/12-D48

Efﬁciency and Power Dissipation @ 25°C

Maximum Current Temperature Derating at Sea Level

(VIN = 48V, airﬂow is from Vin to Vout)

13

12

11

10

9

100

95

90

85

80

75

70

65

60

55

50

12

11

10

9

Natural convection

VIN = 75V

V^IN= 48V

V^IN= 36V

8

7

6

5

8

4

Power Dissipation

(Vin = 48V)

3

7

2

30

35

40

45

50

55

60

65

70

75

80

85

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

12.0

Ambient Temperature (ºC)

Load Current (Amps)

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 9 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

TRANSIENT RESPONSE, ULS-3.3/20-D48

(Resistive loads 50ꢀ with +25ꢀ step Vin=48V)

Transient Response (Load from 75ꢀ to 50ꢀ)

Enable Start-up

Transient Response (Load from 50ꢀ to 75ꢀ)

Enable Start-up (Vin=48V Iout=20A)

Enable Start-up (Vin=48V Iout=0A)

Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)

R/N Waveform (Vin=48V Iout=20A)

R/N Waveform (Vin=48V Iout=0A)

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 10 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES, ULS-12/2.5-D48

Efﬁciency vs. Line Voltage and Load Current @ 25°C

Power Dissipation vs. Load Current @ 25°C

89

88

87

86

85

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

84

83

82

81

80

79

78

77

76

75

VIN = 75V

VIN = 60V

V^IN= 48V

V^IN= 36V

VIN = 75V

V^IN= 60V

V^IN= 48V

V^IN= 36V

0.3

0.5

0.7

0.9

1.2

1.4

1.6

1.8

2.1

2.3

2.5

0.25 0.48 0.70 0.93 1.15 1.38 1.60 1.83 2.05 2.28 2.50

Load Current (Amps)

Maximum Current Temperature Derating at Sea Level

(VIN = 36, 48, and 75V, airﬂow is from pin 3 to pin 1)

Maximum Current Temperature Derating at Sea Level

(VIN = 60V, airﬂow is from pin 3 to pin 1)

3.0

2.5

2.0

2.5

2.0

100 LFM

65 LFM

30

35

40

45

50

55

60

65

70

75

80

85

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature (ºC)

www.murata-ps.com

email: sales@murata-ps.com

19 Jul 2010 MDC_ULS Series.B16 Page 11 of 12

ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES, ULS-12/5-D48

Efﬁciency and Power Dissipation vs. Line Voltage and Load Current @ 25°C

Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, airﬂow is from Vin to Vout)

6

5

4

3

2

1

0

100

95

90

85

80

75

70

65

60

55

50

12

11

10

9

Natural convection

100 LFM

8

VIN = 75V

V^IN= 48V

V^IN= 36V

200 LFM

300 LFM

400 LFM

7

6

5

4

Power Dissipation

(Vin = 48V)

3

2

5.00

30

35

40

45

50

55

60

65

70

75

80

85

0.50

0.95

1.40

1.85

2.30

2.75

3.20

3.65

4.10

4.55

Ambient Temperature (ºC)

Load Current (Amps)

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

19 Jul 2010 MDC_ULS Series.B16 Page 12 of 12


型号：	ULS-15/2-D48NM-C
厂家：	muRata
描述：	民用设备,工业设备电源电路
文件：	总12页 (文件大小：348K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ULS-15/2-D48NM-C [MURATA]

相关型号：

ULS-15/2-D48P-C

ULS-15/2-D48PM-C

ULS-2001H

ULS-2001H-883

ULS-2001R

ULS-2001R-883

ULS-2001RMIL

ULS-2002H

ULS-2002H-883

ULS-2002R-883

ULS-2002RMIL

ULS-2003H-883