UQQ-24/4-Q12P-C_技术文档

UQQ Series

Wide Input Range Single Output DC/DC Converters

For applications requiring wide range input, improved electrical and

thermal perfomance consider Murata Power Solutions’ new UQQ

Series “Quarter-Brick” DC/DC Converters. They measure just 1.45

x 2.22 x 0.43 inches (36.8 x 56.4 x 10.92mm) and ﬁt the industry-

standard footprint.

Typical unit

FEATURES

PRODUCT OVERVIEW

From an 9-36V or 18-75V input, UQQ’s deliver outputs

of 3.3V, 5V,12V,15V, or 24V. They employ an inter-

leaved, synchronous-rectiﬁer topology that exploits

100% of their duty cycle. They simultaneously achieve

ultra-high efﬁciency (to 90%), tight line/load regula-

tion, low noise, and quick step response.

The UQQ’s feature set includes high isolation, input

pi ﬁlters, input undervoltage shutdown, output overvolt-

age 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.

ꢀRoHS compliant

ꢀStandard quarter-brick package/pinout in

through-hole version

ꢀLow cost; Low proﬁle, 0.43”(10.92mm)

ꢀ9-36V or 18-75V wide range inputs

ꢀOutput current: 4 to 25 Amps

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.

All UQQ quarter-bricks are designed with full mag-

netic and optical isolation up to 2250 Volts DC (basic

insulation).

ꢀOutput voltages: 3.3, 5, 12, 15 or 24V

ꢀInterleaved synchronous-rectiﬁer topology

ꢀUltra high efﬁciency

ꢀNo output reverse conduction

ꢀOutstanding thermal performance

ꢀOn/off control, trim & sense functions

ꢀFully isolated, up to 2250Vdc (48 VIN)

ꢀOutput overvoltage protection

SIMPLIFIED SCHEMATIC

ꢃ6/54

ꢀFully I/O protected; Thermal shutdown

ꢃ3%.3%

n6/54

ꢀDesigned to meet UL/EN/IEC60950-1 safety

approvals

ꢃ6).

n6).

ꢀRoHS hazardous substance compliant

n3%.3%

37)4#(

#/.42/,

/.ꢁ/&&

07-

/04/

)3/,!4)/.

2%&%2%.#% ꢀ

%22/2 !-0

42)-

#/.42/,

#/.42/,,%2

)NPUT UNDERꢁOVERVOLTAGEꢂ

CURRENT SENSEꢂ OVER

TEMPERATURE #OMPARATORS

)3/,!4)/.

"!22)%2

Typical topology is shown.

For full details go to

www.murata-ps.com/rohs

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

MDC_UQQ.A10 Page 1 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Performance Speciﬁcations and Ordering Guide ~

PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE

Output

Input

Package

R/N (mVp-p)

Regulation

Line Load

Efﬁciency

VOUT

(V)

IOUT

Power

VIN Nom. Range IIN, no load IIN, full load

(Case/

5

Root Model

(A) (Watts)

(Volts)

(mA)

180

80

(A)

Min.

86%

Typ.

88%

Pinout)

Typ.

50

Max.

80

UQQ-3.3/25-Q12P-C 3.3

UQQ-3.3/25-Q48N-C 3.3

25

17

20

8

82.5

85

0.05%

0.125%

0.2%

12

9-36

7.81

2.01

7.83

2.47

8.99

2.3

C68,P32

80

125

75

48

18-75

9-36

UQQ-5/17-Q12P-C

UQQ-5/20-Q48N-C

UQQ-12/8-Q12P-C

UQQ-12/8-Q48N-C

UQQ-15/7-Q12P-C

UQQ-24/4-Q12P-C

5

40

0.06%

0.165%

0.05%

0.1%

12

150

65

88.5% 90.5% C68,P32

82.5% 84.5% C68,P32

5

100

96

100

40

140

75

48

18-75

9-36

12

15

24

12

180

70

87%

89%

C68,P32

8

96

95

150

100

170

48

18-75

9-36

87.5% 89.5% C68,P32

89% 90.5% C68,P32

7

105

96

56

0.1%

12

250

120

9.67

8.99

4

125

0.075%

12

10-36

87.7

89%

C68,P32

1 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

and 100μF external input capacitor.

2 Ripple/Noise (R/N) measured over a 20MHz bandwidth.

3 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%.)

4 Nominal line voltage, no load/full load condition.

5 Please refer to the Part Number Structure for additional part numbers and options.

PART NUMBER STRUCTURE

U QQ - 5 / 17 - Q12 N B 9 Lx - C

RoHS-6 hazardous substance compliant

(please include this designator for all models)

Output Conﬁguration

Quarter-Brick Package

Nominal Output Voltage

Maximum Rated Output

Pin Length Option

Blank = Std. pin length

L1 = 0.110 (2.79mm)

L2 = 0.145 (3.68mm)

Alternate pin lengths

require quantity order.

}

Baseplate Pin 9 (special order):

Blank = No pin 9, standard

9 = Pin 9 installed, connects to baseplate

Input Voltage Range

Q12 = 9-36V

Q48 = 18-75V

Baseplate (optional):

Blank = no baseplate standard

B = baseplate installed, special order

Remote On/Off Control Polarity:

Add "P" for positive polarity

Add "N" for negative polarity

Note: Some model number combi-

nations may not be available.

Contact Murata Power Solutions.

Some model options may require minimum order quantities.

Pin 9 Baseplate Connection

The UQQ series may include an optional installed baseplate for extended

thermal management. This baseplate is electrically isolated from the rest of the

converter. Various UQQ models are also available with an additional pin 9 on

special quantity order which electrically connects to the baseplate. Pin 9 is also

isolated from the rest of the converter. Please refer to the mechanical drawings.

The baseplate may be ordered by adding a “B” to the model number tree

and pin 9 will be pre-installed by adding a “9”. The two options are separate.

Please refer to the Ordering Guide. Do not order pin 9 without the baseplate.

Note that “pin 9” converters may be on limited forecast, requiring minimum

order quantities and scheduled deliveries.

Pin 9 offers a positive method of controlling the electrical potential of the base- Please see page 9 for heatsink information.

plate, independent of the converter. If you do not include pin 9, the baseplate

may also be grounded by the mounting bolts.

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MDC_UQQ.A10 Page 2 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

MECHANICAL SPECIFICATIONS

4.76

.187

56.4

2.22

4X M3X0.5

THRU , .10" MAX

PENETRATION

(4 PLS)

INPUT/OUTPUT CONNECTIONS

47.24

1.860

12.7

.50

Function P32

-Input

0.25

.010

MIN

BOTTOM

CLEARANCE

C

L

23.6

.93

REF

1

2

3

4

5

6

7

8

9

10.9

.43

Remote On/Off*

+Input

-Output

13.08

.515

REF

-Sense

36.8

1.45

Output Trim

+Sense

26.16

1.030

C

L

+Output

Baseplate (optional)

TOP VIEW

SIDE VIEW

END VIEW

WITH

BASEPLATE

OPTIONAL

END VIEW

WITHOUT

BASEPLATE

* The Remote On/Off can be provided with

either positive ("P" sufﬁx) or negative

("N" sufﬁx) polarity.

BASEPLATE

'B' OPTION

Important! Always connect the sense pins;

see Application Notes.

50.80

2.000

1.57 0.05

2X .062 .002

AT PINS 4 & 8

1.02 0.05

.040 .002

AT PINS 1-3, 5-7, (9)

C

L

.071 .002 ꢀ1.80ꢁ

VENTED SHOULDER

25.4

1.00

REF

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

ON EACH

.040 PIN

3.81

.150

Third Angle Projection

7.62

.300

3.81

.150

8

7

6

5

4

3

2

9

1

C

L

C

L

18.42

.725

REF

Tolerances (unless otherwise speciﬁed):

.XX 0.02 (0.5)

.XXX 0.010 (0.25)

Angles 2ꢀ

7.62

.300

BOTTOM VIEW

Optional pin #9

Connects to baseplate

And is electrically

Components are shown for reference only.

isolated from converter

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. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). 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

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MDC_UQQ.A10 Page 3 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Performance and Functional Speciﬁcations

UQQ-3.3/25-Q12

UQQ-3.3/25-Q48

UQQ-5/17-Q12

UQQ-5/20-Q48

UQQ-12/8-Q12

INPUT

Input Voltage Range

Start-up Threshold

Undervoltage Shutdown

Overvoltage Shutdown

Reﬂected (back) ripple current (2)

Input Current

See ordering guide

9.0 Volts

8.0 Volts

37.5 Volts

25mAp-p

17.50 Volts

16.75 Volts

None

17.5 Volts

9.0 Volts

8.0 Volts

15.75 Volts (I^OUT= ØA)

None

8.0 Volts

37.5 Volts

75mAp-p

37.5 Volts

15mAp-p

75mAp-p

80mAp-p

Full load conditions

Inrush transient

See ordering guide

0.1A²sec

Output short circuit

No load

250mA

100mA

50mA

250mA

150mA

80mA

150mA

65mA

180mA

Low line (V^IN= min.)

10.4 Amps

5.18 Amps

10.44 Amps

6.24 Amps

12.12 Amps

Standby mode

(Off, UV, OT shutdown)

8mA

2mA

8mA

5mA

Internal Input Filter Type

LC

Pi-type

NA

L-C

Reverse Polarity Protection

Yes (15)

Remote On/Off Control (5)

Positive logic (“P” sufﬁx)

OFF = Ground pin to +0.8V max. ON = open or +3.5-15V max.

OFF = open or +5 to +V^INmax. ON = Ground pin to +0.8V max. (16)

Negative logic (“N” sufﬁx)

On/Off Current

1 mA

1mA

1 mA

OUTPUT

Voltage Output Range

See ordering guide

1% of V^NOM

Voltage Output Accuracy

(50% load)

Adjustment Range

10% of VNOM

–20 to +10% of VNOM

0.02% of

V^OUTrange/°C

Temperature Coefﬁcient

Minimum Loading

No minimum load

+10%

Remote Sense Compensation

Ripple/noise (20MHz bandwidth)

Line/Load Regulation

Efﬁciency

See ordering guide

10,000μF

Maximum Capacitive Loading

10,000μF

4700μF

10,000μF

4700μF

Low ESR <0.02Ω max., resistive load

Isolation Voltage

Input to Output

2000 VDC min.

1500 VDC min.

100MΩ

2250 VDC min.

1500 VDC min.

500 VDC min.

100MΩ

2000 VDC min.

1500 VDC min.

750 VDC min.

100MΩ

2250 VDC min.

1500 VDC min.

100MΩ

2250 VDC min.

1500 VDC min.

750 VDC min.

100MΩ

Input fo baseplate

Baseplate to output

Isolation resistance

Isolation capacitance

Isolation safety rating

1500 pF

1000 pF

1500pF

1000 pF

Basic insulation

20.5 Amps

Current limit inception

30 Amps

29 Amps

27 Amps

9.5 Amps

(98% of V^OUT, after warmup)

Short Circuit Protection Method

Short Circuit Current

Current limiting, hiccup autorestart. Remove overload for recovery.

5 Amps 3 Amps 0.5 Amps

Continuous, output shorted to ground (no damage)

3.96 Volts max. 6 Volts 6 Volts

5 Amps

4 Volts

0.5 Amps

14.4 Volts

Short Circuit Duration

Overvoltage Protection

via magnetic feedback

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MDC_UQQ.A10 Page 4 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Performance and Functional Speciﬁcations (continued)

UQQ-12/8-Q48

UQQ-15/7-Q12

UQQ-24/4-Q12

INPUT

Input Voltage Range

See ordering guide

9.0 Volts

Start-up Threshold

Undervoltage Shutdown

Overvoltage Shutdown

Reﬂected (back) ripple current (2)

Input Current

17.5 Volts

16.0 Volts

None

9.0 Volts

8.0 Volts

None

38.5 Volts

15mAp-p

50mAp-p

Full load conditions

Inrush transient

See ordering guide

0.1A²sec

Output short circuit

No load

100mA

70mA

5.93A

250mA

120mA

Low line (V^IN= min.)

12.9 Amps

10.73 Amps

Standby mode

(Off, UV, OT shutdown)

2mA

5mA

Internal Input Filter Type

PI-type

NA

L-C

Reverse Polarity Protection

Yes (15)

Remote On/Off Control (5)

Positive logic (“P” sufﬁx)

OFF = Ground pin to +0.8V max. ON = open or +3.5-15V max.

OFF = open or +5 to +V^INmax. ON = Ground pin to +0.8V max. (16)

1 mA

Negative logic (“N” sufﬁx)

On/Off Current

OUTPUT

Voltage Output Range

See ordering guide

Voltage Output Accuracy

(50% load)

1.25% of V^NOM

1% of VNOM

Adjustment Range

–20 to +10% of VNOM

10% of VNOM

Temperature Coefﬁcient

0.02% of

V^OUTrange/°C

Minimum Loading

No minimum loading

+10%

Remote Sense Compensation

Ripple/noise (20MHz bandwidth)

Line/Load Regulation

Efﬁciency

+10%

See ordering guide

4700μF

Maximum Capacitive Loading

2200ꢁF

1500μF max

Low ESR <0.02Ω max., resistive load

Isolation Voltage

Input to Output

2250 VDC min.

1500 VDC min.

500 VDC min.

100MΩ

2000 VDC min.

1500 VDC min.

100MΩ

2000 VDC min.

1500 VDC min.

100MΩ

Input fo baseplate

Baseplate to Output

Isolation resistance

Isolation capacitance

Isolation safety rating

1000 pF

Basic insulation

9.5 Amps

Current limit inception

12 Amps

5.75 Amps

(98% of V^OUT, after warmup)

Short Circuit Protection Method

Short Circuit Current

Current limiting, hiccup autorestart. Remove overload for recovery

0.1 Amps

0.5 Amps

Short Circuit Duration

Continuous, output shorted to ground (no damage)

Overvoltage Protection

15 Volts

18 Volts

29 Volts

via magnetic feedback

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

MDC_UQQ.A10 Page 5 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

UQQ-3.3/25-Q12 UQQ-3.3/25-Q48 UQQ-5/17-Q12 UQQ-5/20-Q48 UQQ-12/8-Q12 UQQ-12/8-Q48 UQQ-15/7-Q12 UQQ-24/4-Q12

DYNAMIC CHARACTERISTICS

Dynamic Load Response

(50-75-50% load step)

50μsec to 1% 100μsec to 1%

50μsec to 1%

of ﬁnal value

95μsec to 1% 50μsec to 1% 50μsec to 2%

of ﬁnal value of ﬁnal value of ﬁnal value

of ﬁnal value

Start-up Time

VIN to VOUT regulated

10msec

5msec

10msec max

5msec max

10msec

25msec

10msec

20msec

5msec

10msec

Remote On/Off

to VOUT regulated

Switching frequency

ENVIRONMENTAL

255 25kHz

260 25kHz

225-265kHz

260 25kHz

245 20kHz

260 25kHz

Calculated MTBF (4)

TBC

Operating Temperature Range

See Derating curves

–40 to +85ºC

with Derating

Operating Temperature Range –40 to +105ºC

with baseplate

–40 to +100ºC

–40 to +105°C –40 to +105ºC

–40 to +105°C –40 to +100°C –40 to +105°C –40 to +105°C

(no Derating required) (3)(14)

Storage Temperature Range

Thermal Protection/Shutdown

Relative humidity

PHYSICAL

–55 to +125ºC

+120ºC, measured at thermistor T1

To +85°C/85% non-condensing

Outline dimensions

Baseplate material

Pin material

See mechanical speciﬁcations

Aluminum

Copper alloy

Pin diameter

0.04/0.062 inches, 1.016/1.524 mm

1 ounce (28 grams)

Weight

Electromagnetic interference

(conducted, external ﬁlter

required)

Designed to meet FCC part 15, class B, EN55022

Safety

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

UL 94V-0

Flammability

Speciﬁcation Notes:

(8) Output noise may be further reduced by adding an external ﬁlter. See I/O Filtering and Noise

Reduction.

(1) All models are tested and speciﬁed with 300 lfm airﬂow, external 1 and 10ꢁF paralleled ceramic/

tantalum output capacitors and a 100ꢁF external input capacitor. All capacitors are low ESR

types. These capacitors are necessary to accommodate our test equipment and may not be

required in your applications. All models are stable and regulate within spec under no-load

conditions.

(9) All models are fully operational and meet published speciﬁcations, including “cold start” at –40°C.

On-board component package temperatures 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.

General conditions for Speciﬁcations are +25°C, V^IN= nominal, VOUT = nominal, full load unless

noted.

(11) Alternate pin length and/or other output voltages are available under special quantity order.

(12) Overvoltage shutdown on 48V input models can be eliminated under special quantity order. OV

shutdown can be deleted in order to comply with certain telecom reliability requirements. These

requirements attempt continued operation despite signiﬁcant input overvoltage.

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

C^IN= 33ꢁF tantalum, CBUS = 220ꢁF electrolytic, LBUS = 12ꢁH.

(3) 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 of reduced power dissipation with increas-

ing altitude.

(13) Do not exceed maximum power speciﬁcations when adjusting the output trim.

(14) Note that the converter may operate up to +105°C with the baseplate installed (+100°C for the

UQQ-3.3/25-Q48). However, thermal self-protection occurs near +120°C Therefore, +105°C is

recommended to avoid thermal shutdown.

(15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection, always

connect an external input fuse in series with the +V^INinput. Use approximately twice the full

input current rating with nominal input voltage.

(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,

ground ﬁxed conditions, T^PCBOARD= +25°C, full output load, natural air convection.

(5) The On/Off Control may be driven with external logic or by applying appropriate external voltages

which are referenced to Input Common. The On/Off Control Input should use either an open

collector/open drain transistor or logic gate.

(16) For On/Off Control on negative-polarity UQQ-3.3/25-Q48N models, the maximum OFF mode

control voltage is +13.5 Volts. For the ON mode, the range is pin grounded to +1 Volt max.

(17) Always connect the sense pins. If they are not connected to a remote load, connect each sense

(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the

selected setting.

pin to its respective output at the converter pins.

(7) The outputs are not intended to sink appreciable reverse current.

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MDC_UQQ.A10 Page 6 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

They 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,

C^BUSand LBUS simulate a typical dc voltage bus. Your speciﬁc system con-

ﬁguration may necessitate additional considerations.

Absolute Maximum Ratings

Input Voltage

Continuous

Transient (100msec)

12V models

0 to +36V

+50V

48V models

0 to +75V

+100V

On/Off Control

0V min to +13.5V max.

See Fuse section

Input Reverse Polarity Protection

Output Overvoltage

Output Current ⁽⁷⁾

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

and random deviations or PARD) can be reduced below speciﬁed limits

using ﬁltering techniques, the simplest of which is the installation of

additional external output capacitors. Output capacitors function as true

ﬁlter elements and should be selected for bulk capacitance, low ESR, and

appropriate frequency response. In Figure 3, the two copper strips simulate

real-world pcb impedances between the power supply and its load. Scope

measurements should be made using BNC connectors or the probe ground

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

VOUT +20% max.

Current-limited. Devices can

withstand sustained short circuit

without damage.

–55 to +125^°C

Storage Temperature

Lead Temperature

See soldering guidelines

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 nor recommended.

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 be taken into consideration. OS-CON^TMorganic

semiconductor capacitors (www.sanyo.com) can be especially effective for

further reduction of ripple/noise. 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.

Technical Notes

Removal of Soldered UQQ’s from Printed Circuit Boards

Should removal of the UQQ from its soldered connection be needed, thor-

oughly de-solder the pins using solder wicks or de-soldering tools. At no time

should any prying or leverage be used to remove boards that have not been

properly de-soldered ﬁrst.

7

COPPER STRIP

+SENSE

Input Source Impedance

8

+OUTPUT

UQQ 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. 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.

R

LOAD

SCOPE

C1

C2

4

5

–OUTPUT

–SENSE

COPPER STRIP

C1 = 1μF CERAMIC

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

C2 = 10μF TANTALUM

All models in the UQQ Series are tested/speciﬁed for input ripple current (also

called input reﬂected ripple current) and output noise using the circuits and

layout shown in Figures 2 and 3. External input capacitors (C^INin Figure 2)

serve primarily as energy-storage elements.

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

Figure 3. Measuring Output Ripple/Noise (PARD)

TO

CURRENT

PROBE

OSCILLOSCOPE

3

1

+INPUT

–INPUT

L

BUS

+

V

IN

C

BUS

CIN

–

C

IN = 33μF, ESR < 700m7 @ 100kHz

BUS = 220μF, ESR < 100m7 @ 100kHz

LBUS = 12μH

Figure 2. Measuring Input Ripple Current

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MDC_UQQ.A10 Page 7 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Start-Up Threshold and Undervoltage Shutdown

should not be allowed to exceed 0.5V. Consider using heavier wire if this

drop is excessive.

Under normal start-up conditions, the UQQ Series will not begin to regulate

properly until the ramping input voltage exceeds the Start-Up Threshold.

Once operating, devices will turn off when the applied voltage drops below

the Undervoltage Shutdown point. Devices will remain off as long as the

undervoltage condition continues. Units will automatically re-start when

the applied voltage is brought back above the Start-Up Threshold. The

hysteresis built into this function avoids an indeterminate on/off condition

at a single input voltage. See Performance/Functional Speciﬁcations table for

actual limits.

Sense is connected at the load and corrects for resistive errors only. Be

careful where it is connected. Any long, distributed wiring and/or signiﬁcant

inductance introduced into the Sense control loop can adversely affect

overall system stability. If in doubt, test the application, and observe the

DC/DC’s output transient response during step loads. There should be no

appreciable ringing or oscillation. You may also adjust the output trim slightly

to compensate for voltage loss in any external ﬁlter elements. Do not exceed

maximum power ratings.

Start-Up Time

Current Limiting

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

a ramping input voltage crosses the Start-Up Threshold voltage and the

point at which the fully loaded output voltage enters and remains within its

speciﬁed accuracy band. Actual measured times will vary with input source

impedance, external input capacitance, and the slew rate and ﬁnal value of

the input voltage as it appears to the converter. The On/Off to V^OUTstart-up

time assumes that the converter is turned off via the Remote On/Off Control

with the nominal input voltage already applied.

When power demands from the output falls within the current limit incep-

tion range for the rated output current, 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 a

somewhat constant power dissipation. This is commonly referred to as

power limiting. Current limit inception is deﬁned as the point where the full-

power output voltage falls below the speciﬁed tolerance. If the load current

being drawn from the converter is signiﬁcant enough, the unit will go into a

short circuit condition. See “Short Circuit Condition.”

On/Off Control

Short Circuit Condition

The primary-side, Remote On/Off Control function (pin 2) can be speciﬁed

to operate with either positive or negative polarity. Positive-polarity devices

("P" sufﬁx) are enabled when pin 2 is left open or is pulled high. Positive-

polarity devices are disabled when pin 2 is pulled low (with respect to

–Input). Negative-polarity devices are off when pin 2 is high and on when

pin 2 is pulled low. See Figure 4

When a converter is in current limit mode the output voltages 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 of about 50 milliseconds, the PWM will restart, causing the output volt-

ages to begin ramping to their appropriate values. If the short-circuit condi-

tion 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 UQQ is capable of enduring an indeﬁnite short circuit

output condition.

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.

Thermal Shutdown

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UQQ converters are equipped with thermal-shutdown circuitry. If the inter-

nal temperature of the DC/DC converter rises above the designed operating

temperature (See Performance Speciﬁcations), 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.

/.ꢁ/&&

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Output Overvoltage Protection

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The output voltage is monitored for an overvoltage condition via magnetic

coupling to the primary side. If the output voltage rises to a fault condition,

which could be damaging to the load circuitry (see Performance Speciﬁca-

tions), 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 voltages again climb to excessive

levels, the overvoltage circuitry will initiate another shutdown cycle. This

on/off cycling is referred to as “hiccup” mode.

Figure 4. Driving the Remote On/Off Control Pin

Sense Input

Note: The sense and VOUT lines are internally connected through low-value

resistors. Nevertheless, if sense is not used for remote regulation, the user

must connect + sense to + V^OUTand -sense to -VOUT at the converter pins.

Sense is intended to correct small output accuracy errors caused by the

resistive ohmic drop in output wiring as output current increases. This output

drop (the difference between Sense and V^OUTwhen measured at the converter)

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MDC_UQQ.A10 Page 8 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Input Reverse-Polarity Protection

8

1

2

+OUTPUT

–INPUT

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 the source is not current limited or the circuit appropriately fused, it

could cause permanent damage to the converter.

7

+SENSE

6

5

4

ON/OFF

CONTROL

TRIM

–SENSE

LOAD

R^{TRIM UP}

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 a sustained, non-current-limited, input-voltage polarity

reversal exists. For MPS UQQ Series DC/DC Converters, slow-blow fuses are

recommended with values no greater than twice the maximum input current.

3

+INPUT

–OUTPUT

Figure 5. Trim Connections To Increase Output Voltages Using Fixed Resistors

Trimming Output Voltage

8

1

+OUTPUT

–INPUT

UQQ converters have a trim capability (pin 6) that enables users to adjust the

output voltage from +10% to –20% (refer to the trim equations). Adjustments

to the output voltage can be accomplished with a single ﬁxed resistor as shown

in Figures 5 and 6. 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.

7

+SENSE

2

3

6

5

4

ON/OFF

CONTROL

TRIM

–SENSE

LOAD

R^{TRIM DOWN}

+INPUT

Standard UQQ’s have a "positive trim" where 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

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

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 adjust-

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

activate (see Performance Speciﬁcations for overvoltage limits).

Trim Up

Trim Down

UQQ-3.3/25-Q12, UQQ-3.3/25-Q48

13.3(VO – 1.226)

16.31

–10.2

R^T_UP(k7) =

RT_DOWN(k7) =

VO – 3.3

3.3 – V^O

Temperature/power derating is based on maximum output current and voltage

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 UQQ’s

speciﬁed rating, or cause output voltages to climb into the output overvoltage

region. Therefore:

UQQ-5/17-Q12, UQQ-5/20-Q48

25.01

20.4(VO – 1.226)

–10.2

RT_DOWN(k7) =

R^T_UP(k7) =

5 – V^O

VO – 5

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

UQQ-12/8-Q12, UQQ-12/8-Q48

The Trim pin (pin 6) is a relatively high impedance node that can be susceptible

to noise pickup when connected to long conductors in noisy environments. In

such cases, a 0.22ꢁF capacitor to –Output can be added to reduce this long

lead effect.

49.6(VO – 1.226)

60.45

–10.2

RT_DOWN(k7) =

VO – 12

12 – V^O

UQQ-15/7-Q12

76.56

62.9(VO – 1.226)

VO – 15

–10.2

RT_DOWN(k7) =

R^T_UP(k7) =

15 – V^O

UQQ-24/4-Q12

124.2

101 × (VO – 1.226)

VO – 24

–10.2

RT_DOWN(k7) =

24 – V^O

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MDC_UQQ.A10 Page 9 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

UQQ Series Aluminum Heatsink

Thermal Performance

Please note – The UQQ series shares the same heatsink kits as the UVQ

series. Therefore, when ordering these heat sinks, use the model numbers

below which end with the ‘UVQ’ sufﬁx. The UQQ series converter baseplate

can be attached either to an enclosure wall or a heatsink to remove heat from

internal power dissipation. The discussion below concerns only the heatsink

alternative. The UQQ’s are available with a low-proﬁle extruded aluminum

heatsink kit, models HS-QB25-UVQ, HS-QB50-UVQ, and HS-QB100-UVQ.

This kit includes the heatsink, thermal mounting pad, screws and mounting

hardware. See the assembly diagram below. Do not overtighten the screws in

the tapped holes in the converter. This kit adds excellent thermal performance

without sacriﬁcing too much component height. See the Mechanical Outline

Drawings for assembled dimensions. If the thermal pad is ﬁrmly attached, no

thermal compound (“thermal grease”) is required.

The HS-QB25-UVQ heatsink has a thermal resistance of 12 degrees Celsius

per Watt of internal heat dissipation with “natural convection” airﬂow (no

fans or other mechanical airﬂow) at sea level altitude. This thermal resistance

assumes that the heatsink is ﬁrmly attached using the supplied thermal pad

and that there is no nearby wall or enclosure surface to inhibit the airﬂow. The

thermal pad adds a negligible series resistance of approximately 0.5°C/Watt so

that the total assembled resistance is 12.5°C/Watt.

Be aware that we need to handle only the internal heat dissipation, not the full

power output of the converter. This internal heat dissipation is related to the

efﬁciency as follows:

Power Dissipation [Pd] = Power In – Power Out [1]

Power Out / Power In = Efﬁciency [in %] / 100 [2]

When assembling these kits onto the converter, include ALL kit hardware to

assure adequate mechanical capture and proper clearances. Thread relief is

0.090" (2.3mm).

Power Dissipation [Pd] = Power In x (1 –Efﬁciency%/100) [3]

Power Dissipation [Pd] = Power Out x (1 / (Efﬁciency%/100) - 1) [4]

Efﬁciency of course varies with input voltage and the total output power. Please

refer to the Performance Curves.

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Since many applications do include fans, here is an approximate equation to

calculate the net thermal resistance:

RΘ [at airﬂow] = RΘ [natural convection] / (1 + (Airﬂow in LFM) x

[Airﬂow Constant]) [5]

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Where,

RΘ [at airﬂow] is the net thermal resistance (in °C/W) with the amount of

airﬂow available and,

RΘ [natural convection] is the still air total path thermal resistance or in this

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case 12.5°C/Watt and,

“Airﬂow in LFM” is the net air movement ﬂow rate immediately at the converter.

This equation simpliﬁes an otherwise complex aerodynamic model but is a

useful starting point. The “Airﬂow Constant” is dependent on the fan and enclo-

sure geometry. For example, if 200 LFM of airﬂow reduces the effective natural

convection thermal resistance by one half, the airﬂow constant would be

0.005. There is no practical way to publish a “one size ﬁts all” airﬂow constant

because of variations in airﬂow direction, heatsink orientation, adjacent walls,

enclosure geometry, etc. Each application must be determined empirically and

the equation is primarily a way to help understand the cooling arithmetic.

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This equation basically says that small amounts of forced airﬂow are quite

effective removing the heat. But very high airﬂows give diminishing returns.

Conversely, no forced airﬂow causes considerable heat buildup. At zero airﬂow,

cooling occurs only because of natural convection over the heatsink. Natural

convection is often well below 50 LFM, not much of a breeze.

While these equations are useful as a conceptual aid, most users ﬁnd it very

difﬁcult to measure actual airﬂow rates at the converter. Even if you know

the velocity speciﬁcations of the fan, this does not usually relate directly to

the enclosure geometry. Be sure to use a considerable safety margin doing

thermal analysis. If in doubt, measure the actual heat sink temperature with

a calibrated thermocouple, RTD or thermistor. Safe operation should keep the

heat sink below 100°C.

Figure 7. Model UQQ Heatsink Assembly Diagram

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MDC_UQQ.A10 Page 10 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Calculating Maximum Power Dissipation

Heat Sink Example

To determine the maximum amount of internal power dissipation, ﬁnd the

ambient temperature inside the enclosure and the airﬂow (in Linear Feet per

Minute – LFM) at the converter. Determine the expected heat dissipation using

the Efﬁciency curves and the converter Input Voltage. You should also compen-

sate for lower atmospheric pressure if your application altitude is considerably

above sea level.

Assume an efﬁciency of 92% and power output of 100 Watts. Using equation

[4], Pd is about 8.7 Watts at an input voltage of 48 Volts. Using +30°C ambient

temperature inside the enclosure, we wish to limit the heat sink temperature to

+90°C maximum baseplate temperature to stay well away from thermal shut-

down. The +90°C. ﬁgure also allows some margin in case the ambient climbs

above +30°C or the input voltage varies, giving us less than 92% efﬁciency.

The heat sink and airﬂow combination must have the following characteristics:

The general proceedure is to compute the expected temperature rise of the

heatsink. If the heatsink exceeds +100°C. either increase the airﬂow and/or

reduce the power output. Start with this equation:

8.7 W = (90-30) / RΘ[airﬂow] or,

RΘ[airﬂow] = 60/8.7 = 6.9°C/W

Internal Heat Dissipation [Pd in Watts] = (Ts – Ta)/RΘ [at airﬂow] [6]

where “Ta” is the enclosure ambient air temperature and,

where “Ts” is the heatsink temperature and,

Since the ambient thermal resistance of the heatsink and pad is 12.5°C/W, we

need additional forced cooling to get us down to 6.9°C/W. Using a hypothetical

airﬂow constant of 0.005, we can rearrange equation [5] as follows:

where “RΘ [at airﬂow]” is a speciﬁc heat transfer thermal resistance (in

degrees Celsius per Watt) for a particular heat sink at a set airﬂow rate. We

have already estimated RΘ [at airﬂow] in the equations above.

(Required Airﬂow, LFM) x (Airﬂow Constant) = RΘ[Nat.Convection] /

RΘ[at airﬂow] –1, or,

(Required Airﬂow, LFM) x (Airﬂow Constant) = 12.5/6.9 –1 = 0.81

and, rearranging again,

Note particularly that Ta is the air temperature inside the enclosure at the

heatsink, not the outside air temperature. Most enclosures have higher

internal temperatures, especially if the converter is “downwind” from other

heat-producing circuits. Note also that this “Pd” term is only the internal heat

dissipated inside the converter and not the total power output of the converter.

(Required Airﬂow, LFM) = 0.81/0.005 = 162 LFM

162 LFM is the minumum airﬂow to keep the heatsink below +90°C. Increase

the airﬂow to several hundred LFM to reduce the heatsink temperature further

and improve life and reliability.

We can rearrange this equation to give an estimated temperature rise of the

heatsink as follows:

Ts = (Pd x RΘ [at airﬂow]) + Ta [7]

2.28

(57.91)

Heatsink Kit *

Model Number

Still Air (Natural convection)

thermal resistance

Heatsink height

(see drawing)

1.860

(47.24)

HS-QB25-UVQ

HS-QB50-UVQ

HS-QB100-UVQ

12°C/Watt

10.6°C/Watt

8°C/Watt

0.25" (6.35mm)

0.50" (12.7mm)

1.00" (25.4mm)

* Kit includes heatsink, thermal pad and mounting hardware.

1.03

(26.16)

1.45

(36.83)

These model numbers are correct for the UQQ series.

0.140 DIA. (3.56) (4 PLACES)

*

MATERIAL: BLACK ANODIZED ALUMINUM

0.10

(2.54)

* UQQ SERIES HEATSINKS ARE AVAILABLE IN 3 HEIGHTS:

0.25 (6.35), 0.50 (12.70) AND 1.00 (25.4)

Dimensions in inches (mm)

Optional Heatsink

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MDC_UQQ.A10 Page 11 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

UQQ-3.3/25-Q12

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

UQQ-3.3/25-Q48P

Efficiency vs. Line Voltage and Load Current @ 25ºC

90

88

86

84

82

80

78

76

74

90

88

86

84

82

80

78

76

74

72

70

68

66

64

V

IN = 18V

V

IN = 12V

IN = 18V

IN = 24V

IN = 30V

VIN = 24V

V

IN = 36V

IN = 48V

IN = 60V

V

IN = 36V

V

IN = 72V

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

1

2

4

6

8

10

12

14

16

18

20

22

24

26

Load Current (Amps)

UQQ-3.3/25-Q12P Maximum Current Temperature Derating

UQQ-3.3/25-Q12PB Maximum Current Temperature Derating

(no baseplate, V^IN= 12V, air flow is transverse)

(with baseplate, V^IN= 12V, air flow is transverse)

25

24.5

24

25.0

24.5

24.0

23.5

23.0

22.5

22.0

21.5

21.0

20.5

20.0

Natural Convection

23.5

23

100 lfm

22.5

22

100 lfm

200 lfm

300 lfm

400 lfm

21.5

21

200 lfm

20.5

20

300 lfm

19.5

19

18.5

18

20

25

30

35

40

45

50

55

60

65

70

75

80

85

20

25

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature ( C)

°

UQQ-3.3/25-Q48 Maximum Current Temperature Derating at sea level

(V^IN= 48V, with baseplate, transverse air flow)

26

25

24

23

22

21

20

19

18

17

16

15

14

13

Natural Convection

100 LFM

200 LFM

300 LFM

400 LFM

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

Ambient Temperature ( C)

°

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MDC_UQQ.A10 Page 12 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

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6

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6

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6

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ꢂ

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UQQ-5/17-Q12P Maximum Current Temperature Derating

No baseplate, VIN = 12V (transverse air flow at sea level)

With baseplate, VIN = 12V (transverse air flow at sea level)

17

16

15

14

13

12

11

17

16

15

14

13

12

11

400 lfm

300 lfm

Natural Convection

100 lfm

200 lfm

Natural Convection

100 lfm

300 lfm

400 lfm

200 lfm

85

25

30

35

40

45

Ambient Temperature ( C)

50

55

60

65

70

75

80

85

–40

25

30

35

40

45

50

55

60

65

70

75

80

–40

Ambient Temperature ( C)

°

UQQ-5/20-Q48P

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

UQQ-5/20-Q48 Maximum Current Temperature Derating at sea level

(VIN = 48V, with baseplate, transverse airflow)

20

19

18

17

16

15

14

13

12

11

90

85

80

75

70

65

V

IN = 75V

IN = 60V

V

VIN = 48V

VIN = 36V

VIN = 24V

VIN = 18V

Natural Convection

100 lfm

200 lfm

300 lfm

400 lfm

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

Ambient Temperature ( C)

°

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16 17 18 19 20

Load Current (Amps)

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MDC_UQQ.A10 Page 13 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

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,OAD #URRENT ꢇ!MPSꢈ

UQQ-12/8-Q12P Maximum Current Temperature Derating

(no baseplate, V^IN= 12V, air flow is transverse)

With baseplate, V^IN= 12V (transverse air flow at sea level)

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

Natural Convection

100 lfm

200 lfm

300 lfm

400 lfm

200 lfm

Natural Convection

300 lfm

400 lfm

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

–40

25

30

35

40

45

Ambient Temperature ( C)

50

55

60

65

70

75

80

85

Ambient Temperature ( C)

°

www.murata-ps.com

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

MDC_UQQ.A10 Page 14 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

UQQ-12/8-Q48P

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

UQQ-12/8-Q48P Maximum Current Temperature Derating

(With baseplate, VIN = 48V transverse air flow at sea level)

92

90

88

86

84

82

80

78

76

74

8

7.5

7

6.5

6

V

IN = 18V

IN = 36V

IN = 48V

100 lfm

200 lfm

V

5.5

5

V

300 lfm

400 lfm

V

IN = 75V

4.5

4

Natural Convection

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

1

2

3

4

5

6

7

8

Ambient Temperature ( C)

°

Load Current (Amps)

UQQ-12/8-Q48P Maximum Current Temperature Derating

(With baseplate, V^IN= 24V, transverse air flow at sea level)

8

7.5

7

6.5

6

100 lfm

200 lfm

300 lfm

400 lfm

5.5

5

Natural Convection

4.5

4

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

Ambient Temperature ( C)

°

www.murata-ps.com

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

MDC_UQQ.A10 Page 15 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

511ꢀꢃꢁꢂꢄꢀ1ꢃꢅ0

%FFICIENCY VSꢆ ,INE 6OLTAGE AND ,OAD #URRENT ꢅꢁ#

511ꢀꢃꢁꢂꢄꢀ1ꢃꢅ0

0OWER $ISSIPATION VSꢆ ,OAD #URRENT ꢅꢁ#

ꢀꢂ

ꢀꢃ

ꢄꢄ

ꢄꢅ

ꢄꢁ

ꢄꢂ

ꢄꢃ

ꢆꢄ

ꢇꢂ

ꢇꢇ

ꢇꢃ

ꢀ

6

). ꢎ ꢆꢏ6

). ꢎ ꢆꢐ6

). ꢎ ꢄꢉ6

6

ꢄ

6

). ꢎ ꢅꢄ6

ꢆ

6

). ꢎ ꢑ6

). ꢎ ꢅꢄ6

). ꢎ ꢄꢉ6

). ꢎ ꢆꢐ6

). ꢎ ꢆꢏ6

ꢅ

6

ꢊ

6

ꢁ

6

ꢉ

6

). ꢎ ꢑ6

ꢂ

ꢇ

ꢂ

ꢉ

ꢁ

ꢊ

ꢅ

ꢆ

ꢇ

ꢂ

ꢉ

ꢁ

ꢊ

ꢅ

ꢆ

,OAD #URRENT ꢇ!MPSꢈ

UQQ-15/7-Q12P Maximum Current Temperature Derating

With baseplate, V^IN= 12V (transverse air flow at sea level)

7

6.5

6

400 lfm

300 lfm

5.5

5

4.5

4

Natural Convection

100 lfm

200 lfm

3.5

–40

25

30

35

40

45

Ambient Temperature ( C)

50

55

60

65

70

75

80

85

°

www.murata-ps.com

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

MDC_UQQ.A10 Page 16 of 17

UQQ Series

Wide Input Range Single Output DC/DC Converters

Typical Performance Curves

UQQ-24/4-Q12P

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

UQQ-24/4-Q12P

Power Dissipation vs. Load Current @ 25°C

93

92

91

90

89

88

87

86

14

13

12

11

10

9

VIN = 36V

VIN = 30V

VIN = 24V

VIN = 12V

VIN = 10V

V

IN = 10V

IN = 12V

8

7

V

IN = 24V

6

5

VIN = 30V

4

V

IN = 36V

3

2

1

2

3

4

1

2

3

4

Load Current (Amps)

UQQ-24/4-Q12P Maximum Current Temperature Derating

No baseplate, VIN = 12V (transverse air flow at sea level)

With baseplate, VIN = 12V (transverse air flow at sea level)

4

3.8

3.6

3.4

3.2

3

4

3.8

3.6

3.4

3.2

3

400 lfm

300 lfm

400 lfm

300 lfm

Natural Convection

2.8

2.6

2.4

2.2

2

2.8

2.6

2.4

2.2

2

100 lfm

Natural Convection

100 lfm

200 lfm

20

25

30

35

40

45

50

55

60

65

70

75

80

85

20

25

30

35

40

45

50

55

60

65

70

75

80

85

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:

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

Germany:

Japan:

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

12/15/08

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

www.murata-ps.com

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

MDC_UQQ.A10 Page 17 of 17


型号：	UQQ-24/4-Q12P-C
厂家：	muRata
描述：	Wide Input Range Single Output DC/DC Converters 宽输入范围单输出DC / DC转换器转换器
文件：	总17页 (文件大小：456K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UQQ-24/4-Q12P-C [MURATA]

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