UWE-12/3-Q48NBC [MURATA]

DC-DC Regulated Power Supply Module, ROHS COMPLIANT PACKAGE-8;


型号：	UWE-12/3-Q48NBC
厂家：	muRata
描述：	DC-DC Regulated Power Supply Module, ROHS COMPLIANT PACKAGE-8
文件：	总12页 (文件大小：1712K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

The UWE Series "Eighth-Brick" DC/DC Converters are high-current isolated

power modules designed for use in high-density system boards.

PRODUCT OVERVIEW

With dimensions of only 0.9 by 2.3 by 0.36

inches, the UWE series open frame DC/DC convert-

ers deliver up to 75 Watts in an industry-standard

“eighth-brick” through-hole package. This format

can plug directly into quarter-brick pinouts. Several

standard ﬁxed-output voltages from 3.3 Vdc to 24

Vdc assure compatibility in embedded equipment,

tight line/load regulation, stable no-load operation

and fast load step response. All units are precision

assembled in a highly automated facility with ISO-

traceable manufacturing quality standards.

Isolation of 1500 Volts assures safety and fully

differential (ﬂoating) operation for greatest applica-

tion ﬂexibility. On-board Sense inputs compensate

Typical unit

FEATURES

nꢀ

Industry-standard through-hole eighth-brick

package with 0.9" x 2.3" x 0.36" outline

dimensions

CPU cards and instrument subsystems. The extend- for line drop errors at high output currents. Outputs

ed 4-to-1 input power range (9-36V) is ideal for

battery-powered, telecom or portable applications.

Very high efﬁciency means no fans or temperature

deratings in many applications. An optional thermal

mounting baseplate extends operation into most

conceivable environments.

are trimmable within 10ꢀ of nominal voltage. The

UWE series are functionally complete.

nꢀ

Choice of two wide input ranges, 9 - 36 Vdc or

18-75 Vdc

A wealth of protection features prevents damage

to both the converter and outside circuits. Inputs

are protected from undervoltage and outputs fea-

ture short circuit protection, overcurrent and excess

temperature shut down. Overloads automatically

recover using the “hiccup” technique upon fault

removal. The UWE is designed to meet all standard

safety and EMI/RFI certiﬁcations. All units meet

RoHS-6 (no lead) hazardous materials compliance.

nꢀ

Fixed output from 3.3 to 24 Volts DC up to

75 Watts

The synchronous rectiﬁer design uses the

nꢀ

Synchronous rectiﬁcation yields very high

efﬁciency and low power dissipation

maximum available duty cycle for greatest ef-

ﬁciency and low power dissipation with no reverse

output conduction. Other features include low

on-resistance FET’s, planar magnetics and heavy-

copper PC boards. These deliver low output noise,

nꢀ

Operating temperature range from -40 to

+85˚C. with derating

nꢀ

Up to 1500 Volt DC isolation (basic insulation)

nꢀ

Outstanding thermal performance and

derating

nꢀ

Extensive self-protection, overtemperature and

overload features with no output reverse

conduction

+VOUT

+VIN

SWITCH

DRIVE

nꢀ

On/Off control, trim and remote sense functions

VOLTAGE

REGULATOR

nꢀ

Designed to meet UL/EN/IEC 60950-1, CAN/

CSA-C22.2 No. 60950-1 safety approvals

and FCC RFI/EMI certiﬁcation

+SENSE

nꢀ

−VOUT

Pre-bias operation for startup protection

PWM

–VIN

−SENSE

ON/OFF

CONTROL

REFERENCE

AMPLIFIER,

TRIM AND FEEDBACK

ISOLATION

TRIM

UV, OT

Typical topology is shown.

Simpliﬁed Block Diagram

For full details go to

www.murata-ps.com/rohs

www.murata-ps.com

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 1 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters



SPECIFICATION SUMMARY AND ORDERING GUIDE

Output

Input

Iin, no

Efﬁciency

Iin, full

load

(A)

R/N (mVp-p) ➂

Regulation (max.)

Vo u t

(V)

Io u t

(A)

Power

(W)

Vin Nom. Range

load

Package

(Case, Pinout)

Root Model 

UWE-3.3/20-Q12P-C

UWE-3.3/20-Q48N-C

UWE-5/15-Q12P-C

UWE-5/15-Q48N-C

UWE-12/6-Q12P-C

UWE-12/6-Q48N-C

UWE-24/3-Q12P-C

Typ.

Max.

Line

Load

(V)

(mA)

Min.

Typ.

3.3

0.25ꢀ

125

9-36

160

6.18

87ꢀ

89ꢀ

5.0

Please contact Murata Power Solutions for further information.

5.0

C77, P32

12.0

24.0

120

190

180

275

0.125ꢀ

0.05ꢀ

9-36

6.56

90ꢀ

91.5ꢀ

89.5ꢀ

Please contact Murata Power Solutions for further information.

0.125ꢀ

9-36

110

6.70

88.3ꢀ

 Please refer to the part number structure for additonal ordering model numbers and options.

 All speciﬁcations are at nominal line voltage, nominal output voltage and full load, +25° C.

unless otherwise noted. See detailed speciﬁcations.

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

 Load range: 0.1-3A. This is required only for our test equipment. The converter will operate at

zero output current.

 Output capacitors are 1 µF ceramic || 10 µF electrolytic. Input cap is 100 µF. All caps are low

ESR types. Contact Murata Power Solutions for details.

PART NUMBER STRUCTURE

U W E - 12 / 6 - Q12 P B - C

Unipolar, Single-output

RoHS Hazardous Materials Compliance

C=RoHS-6, standard

Wide Input Range

Baseplate (optional)

Blank = No baseplate (standard)

B = Baseplate installed (optional special order)

Eighth-Brick Package

Nominal Output Voltage

On/Off Control Polarity

P = Positive polarity (standard for Q12 models)

N = Negative polarity (optional special order for Q12 models)

Input Voltage Range

Note:

Maximum Rated Output

Current in Amps

Q12 = 9-36 Volts

Q48 = 18-75 Volts

Some model number combinations may

not be available. Contact Murata Power

Solutions for further information.

DETAIL SPECIFICATIONS, Q12 MODELS

UWE-3.3/20-Q12

uWE-5/15-Q12

UWE-12/6-Q12

UWE-24/3-Q12

Specs are typical unless noted.

INPUT

Input voltage range

See ordering guide

none

Start-up threshold, Volts

Undervoltage shutdown, V.

Overvoltage shutdown, V.

Reﬂected (back) ripple current, mA pk-pk

Suggested external fuse, A

Input current

9.5

8.5

Full load conditions

See ordering guide

0.1 A²sec

Inrush transient, A²sec

Input current if output is in short circuit, mA

No load, mA

0.1 A²sec

250

110

9.04

160

Low line (Vin=min.), Amps

Standby mode, mA

8.33

8.89

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 2 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

DETAIL SPECIFICATIONS, CONTIUED

INPUT (continued)

UWE-3.3/20-Q12

uWE-5/15-Q12

UWE-12/6-Q12

UWE-24/3-Q12

(Off, UV, OT shutdown)

Internal input ﬁlter type

L-C

Reverse polarity protection

Remote On/Off control

Yes

OFF=Ground pin to +0.8V max.

ON=open pin or +3.5 to +Vin max.

OFF=open pin or +5V to +Vin max.

ON=Ground pin or 0 to +0.8V max.

Positive logic ("P" model sufﬁx)

Negative logic ("N" model sufﬁx)

Current, mA

OUTPUT

Voltage output range

Voltage output accuracy

Adjustment range

See ordering guide

1ꢀ of Vnom., (50ꢀ load)

-10 to +10ꢀ of Vnom.

0.02ꢀ of Vout range per °C

No minimum load

Temperature coefﬁcient

Minimum loading

Remote sense compensation

Ripple/noise (20 MHz bandwidth)

Line/Load regulation

Efﬁciency

+10ꢀ max.

See ordering guide

Maximum capacitive loading, μF

low ESR <0.02Ω max., resistive load

10,000

4,700

1500

Isolation voltage

Input to Output, Volts min. DC

Input to baseplate, Volts min. DC

Baseplate to output, Volts min. DC

Isolation resistance, MΩ

Isolation capacitance, pF

Isolation safety rating

1500

750

100

1500

1000

4.0

Basic insulation

Current limit inception (98% of

Vout, after warmup), Amps

8.5

Short circuit protection method

Short circuit current, Amps

Short circuit duration

Current limiting, hiccup autorestart. Remove overload for recovery.

0.5

4.5

1.5

1.0

Continuous, output shorted to ground. No damage.

Overvoltage protection, Volts

(via magnetic feedback)

DYNAMIC CHARACTERISTICS

Dynamic load response, μSec

(50-75-50% load step) to 1%

of ﬁnal value

Start-up time

Vin to Vout regulated, mSec

Remote On/Off to Vout regulated, mSec

Switching frequency, KHz

245 25

275 25

215 15

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 3 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

DETAIL SPECIFICATIONS, CONTIUED

ENVIRONMENTAL

UWE-3.3/20-Q12

uWE-5/15-Q12

UWE-12/6-Q12

UWE-24/3-Q12

3,755,203 hours (UWE-12/6-Q12N-C)

1,248,001 hours (UWE-3.3/20-Q12)

Calculated MTBF (Telcordia SR-332)

Calculated MTBF (MIL-HDBK-217N2)

1,239,521 hours (UWE-12/6-Q12N-C)

1,089,141 hours (UWE-3.3/20-Q12)

Operating temperature range

with derating, °C (see Derating curves)

-40 to +85 with derating

Storage temperature range, °C

Thermal protection/shutdown, °C

Relative humidity

PHYSICAL

-55 to +125

+120

to +85°C/85ꢀ non-condensing

Outline dimensions

Pin material

See mechanical specs

Copper alloy

Pin Finish

Nickel underplate with gold overplate (see mechanical specs for details)

Pin diameter, inches

Pin diameter, mm

Weight, ounces

0.04/0.062

1.016/1.575

0.7

Weight, grams

Electromagnetic interference (conducted)

Safety

Designed to meet FCC part 15, class B, EN55022 conducted and CISPR22 class B conducted.

Designed to meet UL/cUL 60950-1, CSA-C22.2 No.60950-1, IEC/EN 60950-1

SPECIFICATION NOTES

CAUTION: This product is not internally fused. To comply with safety agency cer-

tiﬁcations and to avoid injury to personnel or equipment, the user must supply an

external fast-blow fuse to the input terminals. See fuse information.

All models are tested and speciﬁed with external 1µF and 10µF paralleled ceramic/

tantalum output capacitors and a 100 µF external input capacitor. All capacitors are

low ESR types. Contact Murata Power Solutions for details. These capacitors are

necessary to accommodate our test equipment and may not be required to achieve

speciﬁed performance in your applications. However, Murata Power Solutions

recommends using these capacitors in your application. All models are stable and

regulate within spec under no-load conditions.

All models are fully operational and meet published speciﬁcations, including “cold

start” at –40° C. At full power, the package temperature of all on-board components

must not exceed +128° C.

10 Regulation speciﬁcations describe the deviation as the line input voltage or output

load current is varied from a nominal midpoint value to either extreme.

11 If the user adjusts the output voltage, accuracy is dependent on user-supplied

trim resistors. To achieve high accuracy, use 1ꢀ or better tolerance metal-ﬁlm

resistors. If no trim is installed, the converter will achieve its rated accuracy. Do not

exceed maximum power speciﬁcations when adjusting the output trim.

12 Output current limit and short circuit protection is non-latching. When the overcur-

rent fault is removed, the converter will immediately recover.

All speciﬁcations are typical unless noted. General conditions for Speciﬁcations are

+25° C, Vin=nominal, Vout=nominal, full load. Adequate airﬂow must be supplied

for extended testing under power.

13 Alternate pin length and/or other output voltages may be available under special

quantity order.

Input Ripple Current is tested and speciﬁed over a 5 Hz to 20 MHz bandwidth. Input

ﬁltering is Cin=33 µF, Cbus=220 µF, Lbus=12 µH.

14 At zero output current, the output may contain low frequency components which

exceed the ripple speciﬁcation. The output may be operated indeﬁnitely with no

load.

Note that Maximum Power Derating curves indicate an average current at nominal

input voltage. At higher temperatures and/or lower airﬂow, the DC/DC converter will

tolerate brief full current outputs if the total RMS current over time does not exceed

the Derating curve. All Derating curves are presented at sea level altitude. Be aware

that power dissipation degrades as altitude increases.

Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Issue

1, Case 3, Fits 266, ground ﬁxed conditions, Tambient = +30° C, full output load,

natural air convection.

The Remote On/Off Control is normally controlled by a switch or open collector or

open drain transistor. But it may also be driven with external logic or by applying

appropriate external voltages which are referenced to Input Common.

Short circuit shutdown begins when the output voltage degrades approximately 2ꢀ

from the selected setting.

15 Input Fusing: To ensure reverse input protection with full output load, always con-

nect an external input fast-blow fuse in series with the +Vin input. Use approxi-

mately twice the full input current rating at the selected input voltage.

16 “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a

brief, full-current output. If the overcurrent condition still exists, the restart current

will be removed and then tried again. This short current pulse prevents overheating

and damaging the converter. Once the fault is removed, the converter immediately

recovers normal operation.

17 Note that the converter will operate up to the rated baseplate maximum tempera-

ture with the baseplate installed and properly heat sunk. To avoid thermal self-

protection shutdown, do not exceed this maximum baseplate temperature.

18 UWE-24/3-Q12 undervoltage shutdown of 8.0V is at half load.

19 UWE-24/3-Q12 output overvoltage protection requires 0.3A minimum load.

20 Pre-bias operation: Startup will succeed if the output setpoint voltage is higher than

the pre-existing external output voltage.

The outputs are not intended to sink appreciable reverse current.

Output noise may be further reduced by adding an external ﬁlter. See I/O Filtering

and Noise Reduction. Larger caps (especially low-ESR ceramic capacitors) may

slow transient response or degrade stability. Use only as much output ﬁltering as

needed to achieve your noise requirements and no more. Thoroughly test your

system under full load with all components installed.

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 4 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

MECHANICAL SPECIFICATIONS—NO BASEPLATE

2.30

(58.4)

TOP VIEW

ISOMETRIC

VIEW

0.90 (22.9)

.071±.002 STANDOFF

AT EACH

.040 PIN

END VIEW

SIDE VIEW

0.21 (5.3) @

.062 PINS

0.38 (9.7)

MAX

MOUNTING PLANE

.040±.002

AT PINS 1-3, 5-7

0.19 (4.8) @

.040 PINS

I/O CONNECTIONS

.062±.002

AT PINS 4 & 8

Function

- Vin

On/Off Control *

+Vin

0.15 (3.8)

PIN 1

2.000

(50.8)

- Vout

- Sense

Trim

PIN 4

PIN 5

+ Sense

+ Vout

BOTTOM VIEW

* The Remote On/Off can

be provided with either

positive (P suffix) or negative

(N suffix) polarity

.45

.300

.150

.600

REF

.600

.150

Connect each sense input to its

respective Vout if sense is not

connected at a remote load.

PIN 2

PIN 3

PIN 6

PIN 7

PIN 8

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

MATERIAL:

Third Angle Projection

.040 PINS: C26000 BRASS, 3/4 HARD

.062 PINS: C10200 COPPER ALLOY, FULL HARD

FINISH: (ALL PINS)

GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)

Tolerances (unless otherwise speciﬁed):

.XX ꢀ.ꢀ0 (ꢀ.ꢁ)

.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)

Angles 02

Components are shown for reference only.

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 5 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

MECHANICAL SPECIFICATIONS (continued)—BASEPLATE INSTALLED

4X THRU

2.30

(58.4)

M2X0.4 - 6H

.15" MAX SCREW

PENETRATION

TOP VIEW

ISOMETRIC

VIEW

0.90 (22.9)

.625

.40

1.500

0.14 (3.6)

.071±.002 STANDOFF

AT EACH .040 PIN

ALUMINUM

BASEPLATE

END VIEW

SIDE VIEW

0.21 (5.3) @

.062 PINS

0.50 (12.7)

MOUNTING PLANE

.040±.002

AT PINS 1-3, 5-7

0.19 (4.8) @

.040 PINS

.062±.002

AT PINS 4 & 8

0.15 (3.8)

PIN 1

2.000

(50.8)

PIN 4

PIN 5

BOTTOM VIEW

.45

.300

.150

.600

REF

.600

.150

PIN 2

PIN 3

PIN 6

PIN 7

PIN 8

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

MATERIAL:

Third Angle Projection

.040 PINS: C26000 BRASS, 3/4 HARD

.062 PINS: C10200 COPPER ALLOY, FULL HARD

FINISH: (ALL PINS)

GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)

Tolerances (unless otherwise speciﬁed):

.XX ꢀ.ꢀ0 (ꢀ.ꢁ)

.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)

Angles 02

Components are shown for reference only.

www.murata-ps.com

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UWE Series.A11 Page 6 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

Soldering Guidelines

Undervoltage Shutdown limit. Subsequent re-start will not occur until the input

is brought back up to the Start-Up Threshold. This built in hysteresis prevents

any unstable on/off situations from occurring at a single input voltage.

Murata Power Solutions recommends the speciﬁcations below when installing these

converters. These speciﬁcations vary depending on the solder type. Exceeding these

speciﬁcations may cause damage to the product. Be cautious when there is high atmo-

spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your

production environment may differ; therefore please thoroughly review these guidelines

Start-Up Time

The VIN to VOUT Start-Up Time is the interval of time between the point at which

the ramping input voltage crosses the Start-Up Threshold and the fully loaded

output voltage enters and remains within its speciﬁed accuracy band. Actual

measured times will vary with input source impedance, external input/output

capacitance, and load. The UWE Series implements a soft start circuit that

limits the duty cycle of its PWM controller at power up, thereby limiting the

input inrush current.

with your process engineers.

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

For Sn/Ag/Cu based solders:

Maximum Preheat Temperature

Maximum Pot Temperature

Maximum Solder Dwell Time

For Sn/Pb based solders:

Maximum Preheat Temperature

Maximum Pot Temperature

Maximum Solder Dwell Time

115° C.

270° C.

7 seconds

The On/Off Control to VOUT start-up time assumes the converter has its

nominal input voltage applied but is turned off via the On/Off Control pin. The

speciﬁcation deﬁnes the interval between the point at which the converter is

turned on and the fully loaded output voltage enters and remains within its

speciﬁed accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control

to VOUT start-up time is also governed by the internal soft start circuitry and

external load capacitance.

105° C.

250° C.

6 seconds

Absolute Maximum Ratings

Input Voltage

Q12 Models - Volts, max. continuous

Volts, transient, 100 mSec

Q48 Models - Volts, max. continuous

0-36 VDC

0-50 VDC

0-75 VDC

The difference in start up time from VIN to VOUT and from On/Off Control to

VOUT is therefore insigniﬁcant.

Volts, transient, 100 mSec

On/Off Control

0-100 VDC

-0.7 V. min to +Vin max.

Input Source Impedance

UWE converters must be driven from a low ac-impedance input source.

The DC/DC’s performance and stability can be compromised by the use of

highly inductive source impedances. For optimum performance, compo-

nents should be mounted close to the DC/DC converter. If the application

has a high source impedance, low VIN models can benefit from increased

external input capacitance.

Input Reverse Polarity Protection

Output Overvoltage

See Fuse section.

Vout nom. +20ꢀ max.

Output Current (Note 7)

Devices can

Current-limited.

withstand sustained short circuit

without damage.

Overtemperature Protection

Device includes electronic over-

temperature shutdown protection

under normal operation.

-55 to +125° C.

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

Storage Temperature

Lead Temperature

All models in the UWE Converters are tested/speciﬁed for input reﬂected ripple

current and output noise using the speciﬁed external input/output components/

circuits and layout as shown in the following two ﬁgures.

See soldering speciﬁcations

Absolute maximums are stress ratings. Exposure of devices to greater than any of these

conditions may adversely affect long-term reliability. Proper operation under conditions

other than those listed in the Performance/Functional Speciﬁcations Table is not implied or

recommended.

External input capacitors (CIN in Figure 2) serve primarily as energy-storage

elements, minimizing line voltage variations caused by transient IR drops in

conductors from backplane to the DC/DC. Input caps should be selected for bulk

capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current

ratings. The switching nature of DC/DC converters requires that dc voltage

sources have low ac impedance as highly inductive source impedance can affect

system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your

speciﬁc system conﬁguration may necessitate additional considerations.

TECHNICAL NOTES

Input Fusing

Certain applications and/or safety agencies may require the installation of

fuses at the inputs of power conversion components. Fuses should also be

used if the possibility of sustained, non-current-limited, input-voltage polarity

reversals exist. For MPS UWE DC/DC Converters, you should use fast-blow type

fuses, installed in the ungrounded input supply line. Refer to the speciﬁcations

for fuse values.

CURRENT

PROBE

OSCILLOSCOPE

+INPUT

LBUS

All relevant national and international safety standards and regulations must

be observed by the installer. For system safety agency approvals, the convert-

ers must be installed in compliance with the requirements of the end-use

safety standard, e.g., IEC/EN/UL60950-1.

VIN

CBUS

CIN

–

–INPUT

CIN = 33µF, ESR < 700mΩ @ 100kHz

CBUS = 220µF, ESR < 100mΩ @ 100kHz

LBUS = 12µH

Input Undervoltage Shutdown and Start-Up Threshold

Under normal start-up conditions, devices will not begin to regulate until

the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once

operating, devices will not turn off until the input voltage drops below the

Figure 2. Measuring Input Ripple Current

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MDC_UWE Series.A11 Page 7 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

In critical applications, output ripple/noise (also referred to as periodic and

random deviations or PARD) may be reduced below speciﬁed limits using ﬁlter-

ing techniques, the simplest of which is the installation of additional external

output capacitors. These output caps function as true ﬁlter elements and

should be selected for bulk capacitance, low ESR and appropriate frequency

response. All external capacitors should have appropriate voltage ratings and

be located as close to the converter as possible. Temperature variations for all

relevant parameters should also be taken carefully into consideration.

Thermal Shutdown

These UWE converters are equipped with thermal-shutdown circuitry. If envi-

ronmental conditions cause the internal temperature of the DC/DC converter to

rise above the designed operating temperature, a precision temperature sensor

will power down the unit. When the internal temperature decreases below the

threshold of the temperature sensor, the unit will self start. See Performance/

Functional Speciﬁcations.

Output Overvoltage Protection

The most effective combination of external I/O capacitors will be a function

of line voltage and source impedance, as well as particular load and layout

conditions. Our Applications Engineers can recommend potential solutions and

discuss the possibility of our modifying a given device's internal ﬁltering to

meet your speciﬁc requirements. Contact our Applications Engineering Group

for additional details.

UWE output voltages are monitored for an overvoltage condition via magnetic

feedback. The signal is coupled to the primary side and if the output voltage

rises to a level which could be damaging to the load, the sensing circuitry will

power down the PWM controller causing the output voltages to decrease. Fol-

lowing a time-out period the PWM will restart, causing the output voltages to

ramp to their appropriate values. If the fault condition persists, and the output

voltages again climb to excessive levels, the overvoltage circuitry will initiate

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

In Figure 3, the two copper strips simulate real-world pcb impedances

between the power supply and its load. In order to minimize measurement

errors, scope measurements should be made using BNC connectors, or the

probe ground should be less than ½ inch and soldered directly to the ﬁxture.

Current Limiting

As soon as the output current increases to substantially above its rated value,

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

output voltage will decrease proportionately with increases in output current,

thereby maintaining somewhat constant power dissipation. This is commonly

referred to as power limiting. Current limit inception is deﬁned as the point at

which the full-power output voltage falls below the speciﬁed tolerance. See

Performance/Functional Speciﬁcations. If the load current, being drawn from

the converter, is signiﬁcant enough, the unit will go into a short circuit condition

as speciﬁed under "Performance."

COPPER STRIP

+SENSE

+OUTPUT

LOAD

SCOPE

–OUTPUT

–SENSE

COPPER STRIP

Short Circuit Condition

When a converter is in current-limit mode, the output voltage will drop as

the output current demand increases. If the output voltage drops too low, the

magnetically coupled voltage used to develop primary side voltages will also

drop, thereby shutting down the PWM controller. Following a time-out period,

the PWM will restart causing the output voltages to begin ramping to their

appropriate values. If the short-circuit condition persists, another shutdown

cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The

hiccup cycling reduces the average output current, thereby preventing internal

temperatures from rising to excessive levels. The UWE is capable of enduring

an indeﬁnite short circuit output condition.

C1 = 0.47µF CERAMIC

C2 = NA

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

Figure 3. Measuring Output Ripple/Noise (PARD)

Floating Outputs

Since these are isolated DC/DC converters, their outputs are "ﬂoating" with

respect to their input. Designers will normally use the –Output as the ground/

return of the load circuit. You can, however, use the +Output as ground/return

to effectively reverse the output polarity.

Features and Options

Minimum Output Loading Requirements

On/Off Control

UWE converters employ a synchronous-rectiﬁer design topology and all models

regulate within spec and are stable under no-load to full load conditions.

Operation under no-load conditions however might slightly increase the output

ripple and noise.

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

either polarity:

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MDC_UWE Series.A11 Page 8 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

Positive-polarity models (“P" part-number sufﬁx) are enabled when the

On/Off Control is left open or is pulled high, as per Figure 4. Positive-polarity

devices are disabled when the On/Off Control is pulled low.

+OUTPUT

–INPUT

+SENSE

Negative-polarity devices (“N” sufﬁx) are off when the On/Off Control is open

(or pulled high), and on when the On/Off Control is pulled low with respect to

–Vin as shown in Figure 5.

20kΩ

5-20

TURNS

ON/OFF

CONTROL

LOAD

TRIM

–SENSE

+INPUT

–OUTPUT

+ Vcc

ON/OFF CONTROL

CONTROL

Figure 6. Trim Connections Using A Trimpot

+OUTPUT

–INPUT

+SENSE

TRIM

-INPUT

ON/OFF

CONTROL

LOAD

Figure 4. Driving the Positive Polarity On/Off Control Pin

–SENSE

–OUTPUT

+INPUT

+V^CC

Figure 7. Trim Connections To Increase Output Voltages Using a Fixed Resistor

ON/OFF

CONTROL

+OUTPUT

–INPUT

+SENSE

–INPUT

ON/OFF

TRIM

–SENSE

LOAD

CONTROL

Figure 5. Driving the Negative Polarity On/Off Control Pin

+INPUT

–OUTPUT

Figure 8. Trim Connections To Decrease Output Voltages

Dynamic control of the remote on/off function is facilitated with a mechanical

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

A single resistor connected from the Trim to the +Output, or +Sense where

applicable, will increase the output voltage in this conﬁguration. A resistor con-

ate). The drive circuit should be able to sink appropriate current (see Performance nected from the Trim to the –Output, or –Sense where applicable, will decrease

Specs) when activated and withstand appropriate voltage when deactivated.

Applying an external voltage to the On/Off Control when no input power is

applied to the converter can cause permanent damage to the converter.

the output voltage in this conﬁguration.

Trim adjustments greater than the speciﬁed range can have an adverse

affect on the converter's performance and are not recommended. Excessive

voltage differences between VOUT and Sense, in conjunction with trim adjust-

ment of the output voltage, can cause the overvoltage protection circuitry to

activate (see Performance Speciﬁcations for overvoltage limits). Power derating

is based on maximum output current and voltage at the converter’s output

pins. Use of trim and sense functions can cause output voltages to increase,

thereby increasing output power beyond the converter's speciﬁed rating or

cause output voltages to climb into the output overvoltage region. Therefore:

Trimming Output Voltage

UWE converters have a trim capability that allows users to adjust the output

voltages. Adjustments to the output voltages can be accomplished via a trim pot

(Figure 6) or a single ﬁxed resistor as shown in Figures 7 and 8. A single ﬁxed

resistor can increase or decrease the output voltage depending on its connec-

tion. The resistor should be located close to the converter and have a TCR less

than 100ppm/°C to minimize sensitivity to changes in temperature. If the trim

function is not used, leave the trim pin ﬂoating.

(VOUT at pins) x (IOUT) <= rated output power

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MDC_UWE Series.A11 Page 9 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

Remote Sense Note: The Sense and VOUT lines are internally connected

through low value resistors. Nevertheless, if the sense function is not used for

remote regulation the user should connect the +Sense to +VOUT and –Sense to

–VOUT at the DC/DC converter pins.

Trim Equations

3.3 Volt Output

Trim Up

Trim Down

UWE series converters have a sense feature to provide point of use regula-

tion, thereby overcoming moderate IR drops in pcb conductors or cabling.

The remote sense lines carry very little current and therefore require minimal

cross-sectional-area conductors. The sense lines are used by the feedback

control-loop to regulate the output. As such, they are not low impedance points

and must be treated with care in layouts and cabling. Sense lines on a pcb

should be run adjacent to dc signals, preferably ground. In cables and discrete

wiring applications, twisted pair or other techniques should be implemented.

16.31

13.3(VO – 1.226)

VO – 3.3

–10.2

RT_DOWN(kΩ) =

R^T_UP(kΩ) =

3.3 – V^O

5 Volt Output

25.01

20.4(VO – 1.226)

VO – 5

–10.2

RT_DOWN(kΩ) =

5 – V^O

12 Volt Output

UWE series converters will compensate for drops between the output volt-

age at the DC/DC and the sense voltage at the DC/DC provided that:

60.45

49.6(VO – 1.226)

VO – 12

–10.2

RT_DOWN(kΩ) =

12 – V^O

[VOUT(+) –VOUT(–)] –[Sense(+) –Sense (–)] ≤ 5ꢀ VOUT

24 Volt Output

RT_DOWN(kΩ) =

Output overvoltage protection is monitored at the output voltage pin, not

the Sense pin. Therefore, excessive voltage differences between VOUT and

Sense in conjunction with trim adjustment of the output voltage can cause the

overvoltage protection circuitry to activate (see Performance Speciﬁcations

for overvoltage limits). Power derating is based on maximum output current

and voltage at the converter’s output pins. Use of trim and sense functions can

cause output voltages to increase thereby increasing output power beyond the

UWE’s speciﬁed rating or cause output voltages to climb into the output over-

voltage region. Also, the use of Trim Up and Sense combined may not exceed

+10ꢀ of VOUT. Therefore, the designer must ensure:

124.2

101(VO – 1.226)

VO – 24

–10.2

24 – VO

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

tolerances and factory-adjusted output accuracy. VO = desired output voltage.

(VOUT at pins) x (IOUT) ≤ rated output power

Contact and PCB resistance

losses due to IR drops

+OUTPUT

–INPUT

IOUT

+SENSE

Sense Current

ON/OFF

CONTROL

TRIM

–SENSE

LOAD

Sense Return

IOUT Return

+INPUT

–OUTPUT

Contact and PCB resistance

losses due to IR drops

Figure 9. Remote Sense Circuit Conﬁguration

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MDC_UWE Series.A11 Page 10 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

PERFORMANCE DATA

UWE-12/6-Q12N

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

Power Dissipation vs. Load Current @ 25°C

Vin = 36 V

Vin = 30 V

Vin = 24 V

Vin = 12 V

Vin = 10 V

Vin = 9 V

Vin = 36 V

Vin = 30 V

Vin = 24 V

Vin = 12 V

Vin = 10 V

Vin = 9 V

Load Current (Amps)

UWE-12/6-Q12N

Maximum Current Temperature Derating @ sea level

Maximum Current Temperature Derating @sea level

(Vin = 12V, transverse airﬂow, no baseplate)

(Vin = 12V, transverse airﬂow, with baseplate)

6.0

5.5

5.0

4.5

4.0

Natural Convection

100 LFM

Natural Convection

5.5

200 LFM

300+ LFM

100 LFM

200 LFM

300 LFM

400 LFM

5.0

4.5

4.0

Ambient Temperature (°C)

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MDC_UWE Series.A11 Page 11 of 12

UWE Series

Wide Input, Isolated

Eighth-Brick DC/DC Converters

PERFORMANCE DATA

UWE-24/3-Q12P

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

Power Dissipation vs. Load Current @ 25°C

Vin = 36 V

Vin = 30 V

Vin = 24 V

Vin = 12 V

Vin = 10 V

Vin = 9 V

Vin = 36 V

Vin = 30 V

Vin = 24 V

Vin = 12 V

Vin = 10 V

Vin = 9 V

0.5

1.5

2.5

Load Current (Amps)

0.5

1.5

2.5

Load Current (Amps)

UWE-24/3-Q12P

Maximum Current Temperature Derating @ sea level

Maximum Current Temperature Derating @sea level

(Vin = 12V, transverse airﬂow, no baseplate)

(Vin = 12V, transverse airﬂow, with baseplate)

3.20

3.10

3.00

3.20

3.00

2.80

2.60

2.40

2.90

Natural Convection

100 LFM

Natural Convection

100 LFM

200 LFM

300 LFM

400 LFM

2.80

2.70

2.60

2.50

2.40

200 LFM

300 LFM

400 LFM

Ambient Temperature (°C)

USA:

Mansﬁeld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com

Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com

Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com

Canada:

UK:

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 U.S.A.

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

France:

Germany:

Japan:

Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com

München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com

Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com

Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com

www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED

11/17/08

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁcations are subject to change without

China:

Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com

Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com

notice.

Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com

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MDC_UWE Series.A11 Page 12 of 12

UWE-12/3-Q48NBC [MURATA]

相关型号：

UWE-12/3-Q48NC

UWE-12/3-Q48PBC

UWE-12/3-Q48PC

UWE-12/6-Q12N-C

UWE-12/6-Q12NB-C

UWE-12/6-Q12P-C

UWE-12/6-Q12PB-C

UWE-12/6-Q12PC

UWE-12/6-Q48N-C

UWE-12/6-Q48NB-C

UWE-12/6-Q48NC

UWE-12/6-Q48P-C