UCQ-1.2/40-D24PBH-C_技术文档

Single Output UCQ Models

www.murata-ps.com

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

Typical units

FEATURES

PRODUCT OVERVIEW

ꢀ

For applications requiring improved electrical and

thermal performance at reduced cost, consider

DATEL’s new UCQ series “quarter brick” DC/DC

power converters. These compact units measure

just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm)

and ﬁt the industry-standard footprint.

The UCQ’s feature full isolation to 2250Vdc

meeting BASIC insulation requirements of

Standard quarter-brick package/pinout

ꢀ

Low cost; Low proﬁle, 0.4" (10.2mm)

UL/EN/IEC 60950-1. Input ﬁlters reduce propa-

gated switching noise back to input sources. Also

included is a remote On/Off switch control (with

positive or negative polarity), output trim adjustable

over nominal and output sense functions to reduce

ꢀ

24V or 48V nominal input

ꢀ

Outputs: 1.2V to 15V

ꢀ

Interleaved synchronous-rectiﬁer topology

• Ultra high efﬁciency

• No output reverse conduction

Available outputs range between 1.2V @ 30 Amps

to 15V @ 6.7 Amps and accept a wide input range. power lead losses. Extensive protection items

The UCQ’s interleaved, synchronous-rectiﬁer

topology offers high efﬁciency (up to 93%), tight

line and load regulation, low noise and fast step

response. A single-board optimized open-frame

design contributes to impressive thermal opera-

tion. UCQ’s will operate up to +70°C and 100 LFM

airﬂow with no derating.

avoid damage from out of limit voltages, currents

and temperatures. Protection faults automatically

recover using the hiccup technique. Besides safety

testing to 60950-1, certiﬁcations for the UCQ in-

clude application for EMC compliance (to EN55022/

CISPR22 with ﬁlter), qualiﬁcation testing.

ꢀ

Outstanding thermal performance

ꢀ

On/off control, trim & sense functions

ꢀ

Fully isolated, 2250Vdc (BASIC)

Output overvoltage protection

ꢀ

Fully I/O protected; Thermal shutdown

ꢀ

Designed to meet UL/EN/IEC60950-1

safety approvals

+SENSE

(7)

+V^OUT

(8)

+V^IN

(3)

SWITCH

CONTROL

–V^OUT

(4)

–VIN

(1)

–SENSE

(5)

PWM

CONTROLLER

OPTO

ISOLATION

REFERENCE &

ERROR AMP

VOUT

TRIM

(6)

INPUT UNDERVOLTAGE, INPUT

OVERVOLTAGE, AND OUTPUT

OVERVOLTAGE COMPARATORS

* Can be ordered with positive (standard) or negative (optional) polarity.

REMOTE

ON/OFF

CONTROL*

(2)

Figure 1. Simpliﬁed Schematic

For full details go to

www.murata-ps.com/rohs

Typical topology may vary between units.

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MDC_UCQ Models.B20 Page 1 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀

Output

Input

R/N (mVp-p)

Regulation (Max.) ➁

Line Load

I^INfull

load

Efﬁciency

V^OUT

I^OUT

Power

VIN Nom.

(Volts)

Range

IIN no

(Volts) (Amps) (Watts) Typ.

Max.

(Volts) load (mA) (Amps)

Min.

Typ.

Root Models ➀

UCQ-1.2/40-D24P-C

UCQ-1.2/30-D48N-C

UCQ-1.5/25-D48N-C

UCQ-1.5/40-D48N-C

UCQ-1.8/30-D48N-C

UCQ-1.8/40-D48N-C

UCQ-2.5/40-D24P-C

UCQ-2.5/30-D48N-C

UCQ-3.3/35-D24P-C

UCQ-3.3/20-D48N-C

UCQ-3.3/30-D48N-C

UCQ-3.3/40-D48N-C

UCQ-5/20-D24P-C

UCQ-5/20-D48N-C

UCQ-5/25-D48N-C

UCQ-12/8.3-D48N-C

UCQ-15/6.7-D48N-C

1.2

1.5

1.8

2.5

3.3

5

40

30

25

40

30

40

30

35

20

30

40

20

25

8.3

48

36

Please contact Murata Power Solutions for further information.

50

80

50

80

50

80

50

60

50

35

50

100

80

0.125%

0.1%

0.25%

0.2%

48

24

48

24

48

24

48

36-75

18-36

36-75

18-36

36-75

18-36

36-75

30

50

0.90

0.94

1.45

1.31

1.70

4.96

1.80

5.41

1.53

2.3

81%

85%

83%

86%

82%

85%

87%

88.5%

89.5%

89%

88%

89%

88%

90%

83%

86%

88%

84%

87%

89%

90%

91%

90%

91.5%

92%

90%

91%

92%

37.5

60

100

120

100

120

80

50

54

45

72

30

100

75

0.125%

0.25%

0.2%

120

50

115.5

66

130

50

0.125%

0.1%

99

80

50

132

100

125

99.6

100

60

30

3.06

4.55

2.26

2.89

2.28

0.125%

0.25%

160

80

5

55

5

100

150

30

12

15

80

100

6.7 100.5 100

➀ Please refer to the part number structure for additional ordering part numbers and options.

➁ All speciﬁcations are at nominal line voltage and full load, +25 deg.C unless otherwise noted. See detailed speciﬁcations. Output capacitors are 1 μF ceramic || 10 μF electrolytic. I/O caps are necessary for

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

Outline dimensions: 2.3 × 1.45 × 0.40 inches

58.4 × 36.8 × 10.2 mm

Pinout: P32 (all models)

PART NUMBER STRUCTURE

U CQ - 3.3 / 30 D48 N B H Lx - C

-

Output

Conﬁguration:

Unipolar,

single output

RoHS Hazardous Materials compliance

C = RoHS-6, standard (does not claim EU RoHS exemption 7B–lead in solder)

Y = RoHS-5 (with lead), optional, special order

Pin length option

Blank = standard pin length 0.180 in. (4.6 mm)

L1 = 0.110 in. (2.79 mm)*

Quarter-Brick Package

Nominal Output Voltage

L2 = 0.145 in. (3.68 mm)*

*Special quantity order is required;

no sample quantities available.

Maximum Rated Output :

Current in Amps

Conformal coating (optional)

Blank = no coating, standard

H = coating added, optional special order

Input Voltage Range:

D24 = 18-36 Volts (24V nominal)

D48 = 36-75 Volts (48V nominal)

Note:

Baseplate (optional)

Some model number combinations

may not be available. Please contact

Murata Power Solutions.

Blank = No baseplate, standard

B = Baseplate installed, optional special order

On/Off Control Polarity

P = Positive polarity (standard for D24, optional for D48)

N = Negative polarity (standard for D48, optional for D24)

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MDC_UCQ Models.B20 Page 2 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48

Input

Input voltage range

Start-up threshold, Volts

See ordering guide.

34

33

34

32

34

32

Undervoltage

shutdown, V

32.5

none

32.5

Overvoltage shutdown

Reﬂected (back) ripple

current, mA pk-pk

10-30, model dependent

Input Current

Full load conditions

Inrush transient, A²sec

Output short circuit, mA

See ordering guide.

0.05

50-200, model dependent

Low line (VIN = min.),

Amps

1.23

1.26

L-C

1.96

1.74

2.30

Standby mode, mA

(Off, UV, OT shutdown)

1-10, model dependent

Pi-type

Internal input ﬁlter type

Pi-type

Reverse polarity

protection

None, install external fuse.

Remote On/Off Control

Positive logic

OFF = Ground pin to +0.8V

(P model sufﬁx)

ON = Open or +3.5 to +13.5V max

Negative logic

(N model sufﬁx)

OFF = Open or +3.5 to +13.5V

ON = Ground pin to +0.8V max

Current, mA

1

Output

Voltage output range

Voltage output accuracy

See ordering guide.

1% of V^NOM., (50% load)

Adjustment range,

% of VNOM.

10%

−20 + 10

10%

Temperature coefﬁcient

Minimum loading

0.02% of VOUT range per °C

No minimum loading.

Remote sense

compensation

+10%

Ripple/noise

(20 MHz bandwidth)

See ordering guide.

Line/Load regulation

Efﬁciency

See ordering guide.

Maximum capacitive

loading, μF low ESR

<0.02Ω max.,

1,000

10,000

4,700

10,000

resistive load

➀ Specs are typical unless noted.

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MDC_UCQ Models.B20 Page 3 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48

Input

Input voltage range

Start-up threshold, Volts

See ordering guide.

17

16.8

15

34

32

35

34

Undervoltage

shutdown, V

15

none

34

Overvoltage shutdown

Reﬂected (back) ripple

current, mA pk-pk

10-30, model dependent

Input Current

Full load conditions

Inrush transient, A²sec

Output short circuit, mA

See ordering guide.

0.05

50-200, model dependent

Low line (V^IN= min.),

Amps

6.69

Pi

2.39

L-C

7.21

2.04

Pi

3.02

Pi

Standby mode, mA

(Off, UV, OT shutdown)

1-10, model dependent

L-C

Internal input ﬁlter type

Reverse polarity

protection

None, install external fuse.

Remote On/Off Control

Positive logic

OFF = Ground pin to +0.8V

(P model sufﬁx)

ON = Open or +3.5 to +13.5V max

Negative logic

(N model sufﬁx)

OFF = Open or +3.5 to +13.5V

ON = Ground pin to +0.8V max

Current, mA

1

Output

Voltage output range

Voltage output accuracy

See ordering guide.

1% of V^NOM., (50% load)

Adjustment range,

% of VNOM.

−20 + 10

10%

−10 to + 10%

Temperature coefﬁcient

Minimum loading

0.02% of VOUT range per °C

No minimum loading.

Remote sense

compensation

+10%

Ripple/noise

(20 MHz bandwidth)

See ordering guide.

Line/Load regulation

Efﬁciency

See ordering guide.

Maximum capacitive

loading, μF low ESR

<0.02Ω max.,

10,000

resistive load

➀ Specs are typical unless noted.

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MDC_UCQ Models.B20 Page 4 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-3.3/40-D48 UCQ-5/20-D24

UCQ-5/20-D48

UCQ-5/25-D48 UCQ-12/8.3-D48

UCQ-15/6.7-D48N-C

Input

Input voltage range

Start-up threshold, Volts

See ordering guide

33

17

16

35

34

35

34

35

34

Undervoltage

shutdown, V

31.5

Overvoltage shutdown

none

Reﬂected (back) ripple

current, mA pk-pk

10-30, model dependent.

60 max.

Input Current

Full load conditions

Inrush transient, A²sec

Output short circuit, mA

See ordering guide.

0.05

0.1

0.03

120

1200

50-200, model dependent

Low line (V^IN= min.),

Amps

4.12

6.04

L-C

3.02

3.82

3.04

L-C

3.03

Standby mode, mA

(Off, UV, OT shutdown)

1-10, model dependent

L-C

Internal input ﬁlter type

Pi

L-C

Pi

Reverse polarity

protection

None, install external fuse.

Remote On/Off Control

Positive logic

(P model sufﬁx)

OFF = Ground pin to +0.8V

ON = Open or +3.5 to +13.5V max

OFF = Ground pin or to +1V.

ON = Open or +2.5 to +13.5V

Negative logic

(N model sufﬁx)

OFF = Open or +3.5 to +13.5V

ON = Ground pin to +0.8V max

OFF = Open or +2.5 to +13.5V

ON = Ground pin or to +1V.

Current, mA

1

Output

Voltage output range

Voltage output accuracy

See ordering guide.

1% of V^NOM., (50% load)

Adjustment range,

% of VNOM.

−10 to + 10%

Temperature coefﬁcient

Minimum loading

0.02% of V^OUTrange per °C.

No minimum loading.

Remote sense

compensation

+10%

Ripple/noise

(20 MHz bandwidth)

See ordering guide.

Line/Load regulation

Efﬁciency

See ordering guide.

Maximum capacitive

loading, μF low ESR

<0.02Ω max.,

10,000

1,000

1000

resistive load

➀ Specs are typical unless noted.

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MDC_UCQ Models.B20 Page 5 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48

Isolation Voltage

Input to Output,

Volts min.

2250

1500

Input to baseplate,

Volts min.

Baseplate to output,

Volts min.

Isolation resistance, MΩ

Isolation capacitance, pF

Isolation safety rating

Miscellaneous

10-100, model dependent

1000

Basic insulation

Current limit inception

(98% of V^OUT, after

warmup), Amps

35

49

35

49

Short circuit protection

method

Current limiting, hiccup autorestart. Remove overload for recovery.

Short circuit current,

Amps

5

Short circuit duration

Continuous, output shorted to ground. No damage.

Overvoltage protection,

Volts (via magnetic

feedback)

1.8

1.95

2.7 V max

2.2

Dynamic characteristics

Dynamic load response 200 μSec to 1% 200 μSec to 1% 50 μSec to 1% of 100 μSec to 1% 50 μSec to 1% of

(50-75-50% load step) of ﬁnal value

of ﬁnal value

ﬁnal value

of ﬁnal value

ﬁnal value

Start-up time

VIN to VOUT regulated,

mSec

10 max.

Remote On/Off to V^OUT

regulated, mSec

10 max.

Switching frequency, KHz

350 20

2M hours

440 40

400 40

400

380 40

Environmental

Calculated MTBF

2.1M hours

2.2M hours

2M hours

2.1M hours

Operating temperature

range, °C

−40 to +85, with derating

See Derating curves.

Operating case

temperature, °C

(no derating)

−40 to +120, model dependent

−55 to +125

Storage temperature

range, °C

Thermal protection/

shutdown, °C

110-125, model dependent

Relative humidity

To +85°C/85%, non-condensing

➀ Specs are typical unless noted.

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MDC_UCQ Models.B20 Page 6 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48

Isolation Voltage

Input to Output,

Volts min.

2250

1500

Input to baseplate,

Volts min.

Baseplate to output,

Volts min.

Isolation resistance, MΩ

Isolation capacitance, pF

Isolation safety rating

Miscellaneous

10-100, model dependent

1000

Basic insulation

Current limit inception

(98% of V^OUT, after

warmup), Amps

46

37

41

24

35

Short circuit protection

method

Current limiting, hiccup autorestart. Remove overload for recovery.

Short circuit current,

Amps

5

12

5

Short circuit duration

Continuous, output shorted to ground. No damage.

Overvoltage protection,

Volts (via magnetic

feedback)

2.95

4

4.6

4

Dynamic characteristics

Dynamic load response 200 μSec to 1% 200 μSec to 1% 200 μSec to 1% 200 μSec to 1.5% 200 μSec to 1%

(50-75-50% load step) of ﬁnal value

of ﬁnal value

Start-up time

VIN to VOUT regulated,

mSec

10 max.

Remote On/Off to V^OUT

regulated, mSec

10 max.

Switching frequency, KHz

480

480 30

350 10

330 40

Environmental

Calculated MTBF

2.1M hours

2.2M hours

1.7M hours

1.8M hours

1.7M hours

Operating temperature

range, °C

−40 to +85, with derating

See Derating curves.

Operating case

temperature, °C

(no derating)

−40 to +120, model dependent

−55 to +125

Storage temperature

range, °C

Thermal protection/

shutdown, °C

110-125, model dependent

Relative humidity

To +85°C/85%, non-condensing

➀ Specs are typical unless noted.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 7 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-3.3/40-D48 UCQ-5/20-D24

UCQ-5/20-D48

UCQ-5/25-D48 UCQ-12/8.3-D48

UCQ-15/6.7-D48N-C

Isolation Voltage

Input to Output,

Volts min.

2250

1500

Input to baseplate,

Volts min.

Baseplate to output,

Volts min.

Isolation resistance, MΩ

Isolation capacitance, pF

Isolation safety rating

Miscellaneous

10-100, model dependent

1000

Basic insulation

Current limit inception

(98% of V^OUT, after

warmup), Amps

49

26

22

27

10

9

Short circuit protection

method

Current limiting, hiccup autorestart. Remove overload for recovery.

Short circuit current,

Amps

15

5

TBD

2

Short circuit duration

Continuous, output shorted to ground. No damage.

Overvoltage protection,

Volts (via magnetic

feedback)

4.25

6.25

TBD

6.2

14.4

18

Dynamic characteristics

Dynamic load response 50 μSec to 1% of 200 μSec to 1% 200 μSec to 1% 200 μSec to 1% 200 μSec to 1%

150 μSec to 2% of ﬁnal value

(50-75-50% load step)

ﬁnal value

of ﬁnal value

Start-up time

VIN to VOUT regulated,

mSec

5

4

10 max.

Remote On/Off to VOUT

regulated, mSec

5

4

10 max.

Switching frequency, KHz

360 20

400 24

315 30

330 40

300 30 KHz

Environmental

Calculated MTBF

2.2M hours

TBD

1.7M hours

1.8M hours

TBD

Operating temperature

range, °C.

−40 to +85, with derating

See Derating curves.

Operating case

temperature, °C

(no derating)

−40 to +120, model dependent

−40 to +110

Storage temperature

range, °C

−55 to +125

Thermal protection/

shutdown, °C

110-125, model dependent

Relative humidity

To +85°C/85%, non-condensing

➀ Specs are typical unless noted.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 8 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

FUNCTIONAL SPECIFICATIONS

UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48

Physical

Outline dimensions

Pin material

Pin diameter

Pin ﬁnish

See mechanical specs.

Copper alloy

0.040/0.062 inches (1.016/1.575 mm)

Nickel underplate with gold overplate

Weight, ounces

Weight, grams

0.9

25

1.06

30

0.9

25

0.9

25

1.23

35

Electromagnetic

interference

Designed to meet EN55022/CISPR22 (External ﬁlter required)

Safety

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

UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48

Physical

Outline dimensions

Pin material

Pin diameter

Pin ﬁnish

See mechanical specs.

Copper alloy

0.040/0.062 inches (1.016/1.575 mm)

Nickel underplate with gold overplate

Weight, ounces

Weight, grams

1.06

30

1.06

30

1.06

30

0.7

20

1.06

30

Electromagnetic

interference

Designed to meet EN55022/CISPR22 (External ﬁlter required)

Safety

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

UCQ-3.3/40-D48 UCQ-5/20-D24

UCQ-5/20-D48

UCQ-5/25-D48 UCQ-12/8.3-D48

UCQ-15/6.7-D48N-C

Physical

Outline dimensions

Pin material

Pin diameter

Pin ﬁnish

See mechanical specs.

Copper alloy

0.040/0.062 inches (1.016/1.575 mm)

Nickel underplate with gold overplate

Weight, ounces

Weight, grams

1.25

35.5

1.06

30

1.06

30

1.06

30

1.13

32

1.034

29.3

Electromagnetic

interference

Designed to meet EN55022/CISPR22 (External ﬁlter required)

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

Safety

➀ Specs are typical unless noted.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 9 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

Speciﬁcation Notes

(1) All models are tested and speciﬁed with external 1||10 μF ceramic/tantalum output capacitors no external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate

our test equipment and may not be required to achieve speciﬁed performance in your applications. All models are stable and regulate within spec under no-load conditions. All speciﬁcations are typical unless

noted. General conditions for Speciﬁcations are +25 deg.C, VIN and VOUT = nominal, full load. Adequate airﬂow must be supplied for extended testing under power.

(2) Input Ripple Current is tested and speciﬁed over a 5 Hz to 20 MHz bandwidth. Input ﬁltering is C^IN= 33 μF, 100V tantalum, CBUS = 220 μF, 100V electrolytic, LBUS = 12 μH.

(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 increasing altitude.

(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground ﬁxed conditions, Tpcboard = +25 deg.C, full output load, natural air convection.

(5) The 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.

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

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

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

(9) All models are fully operational and meet published speciﬁcations, including “cold start” at –40 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) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use 1% or better tolerance metal-ﬁlm resistors mounted close to the converter.

(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover.

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

(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.

(15) Input Fusing: To ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +V^INinput. Use approximately twice the full input current rating with

nominal 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) Normally, the Sense lines are connected at the remote load to compensate for IR voltage drops in the power wiring and to improve dynamic response. If Sense is not used, each Sense pin should be con-

nected at the converter to its respective Vout pin.

Product Adaptations

Murata Power Solutions offers several variations of our core product family.

These products are available under scheduled quantity orders and may also

include separate manufacturing documentation from a mutually agreeable

Product Speciﬁcation. Since these product adaptations largely share a common

parts list and similar speciﬁcations and test methods with their root products,

they are provided at excellent costs and delivery. Please contact Murata Power

Solutions for details.

These models are all negative On/Off polarity, no baseplate, conformal coat-

ing added, 3.68mm pin length, and RoHS-5 hazardous substance compliance

(with lead).

UCQ-3.3/30-D48NBHL2-Y

UCQ-3.3/40-D48NBHL2-Y

These models are all negative On/Off polarity, baseplate installed, conformal

coating added, 3.68mm pin length, and RoHS-5 hazardous substance compli-

ance (with lead).

As of this date, the following products are available:

UCQ-1.2/30-D48NHL2-Y

UCQ-1.8/30-D48NHL2-Y

Absolute Maximum Ratings

UCQ-1.8/40-D48NHL2-Y

Input Voltage

Continuous

Transient (100msec)

24V Models

0 to +36 Volts

+50 Volts

48V Models

0 to +75 Volts

+100 Volts

UCQ-2.5/30-D48NHL2-Y

UCQ-2.5/40-D48NHL2-Y

On/Off Control

Input Reverse Polarity Protection

Output Current

0V min. to +13.5V max.

See Fuse section

Current-limited. Devices can withstand

sustained short circuit without damage.

–40 to +100°C (with derating)

–55 to +125°C

UCQ-5/20-D48NHL2-Y

UCQ-12/8.3-D48NHL2-Y

Operating Temperature

Storage Temperature

These 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.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 10 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-1.2/30-D48 Maximum Current Temperature Derating

No baseplate, V^IN= 48V (at sea level), longitudinal airflow

UCQ-1.2/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C

95

35

30

25

90

85

80

75

70

20

V

IN = 36V

400 LFM

65

60

55

50

45

40

300 LFM

V

IN = 48V

15

200 LFM

V

IN = 75V

100 LFM

10

5

0

3

6

9

12

15

18

21

24

27

75

30

35

40

45

50

55

60

65

70

75

80

Load Current (Amps)

Ambient Temperature ( C)

°

UCQ-1.5/25-D48 Efficiency vs Line Voltage and Load Current @25˚ C

UCQ-1.5/25-D48 Maximum Current Temperature Derating

No baseplate, V^IN= 48V (at sea level), longitudinal airflow

90

88

86

84

82

80

78

30

25

20

15

10

VIN = 75V

76

74

72

70

68

66

64

62

60

V

IN = 48V

V

IN = 36V

400 LFM

300 LFM

200 LFM

5

100 LFM

0

3

4

5

6

7

8

9

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

30

35

40

45

50

55

60

65

Load Current (Amps)

Ambient Temperature ( C)

°

UCQ-1.8/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C

UCQ-1.8/30-D48 Maximum Current Temperature Derating

No baseplate, V^IN= 48V (at sea level), longitudinal airflow

90

32

30

28

26

24

88

86

84

V

IN = 36V

IN = 48V

IN = 75V

82

80

78

76

74

72

70

V

22

400 LFM

300 LFM

200 LFM

20

100 LFM

Natural convection

18

4

6

8

10

12

14

16

18

20

22

24

26

28

30

35

40

45

50

55

60

65

Load Current (Amps)

Ambient Temperature ( C)

°

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 11 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-1.8/40-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, no baseplate, airflow is from Vin to Vout)

UCQ-1.8/40-D48 Efficiency and Power Dissipation @25˚ C

95

22

20

18

16

14

12

10

8

45

40

35

30

90

85

V

IN = 75V

80

75

70

65

60

55

50

45

40

V

IN = 48V

400 LFM

V

IN = 36V

25

300 LFM

200 LFM

20

15

10

5

100 LFM

Natural Convection

6

4

Power Dissipation

IN = 48V

2

V

0

30

35

40

45

50

55

60

65

70

75

80

85

4

8

12

16

20

24

28

32

36

40

Ambient Temperature ( C)

°

Load Current (Amps)

UCQ-2.5/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C

UCQ-2.5/30-D48 Maximum Current Temperature Derating

No baseplate, V^IN= 24V (at sea level)

95

35

30

25

20

15

90

85

80

75

V

IN = 75V

70

65

60

55

50

45

40

V

IN = 48V

V

IN = 36V

400 LFM

10

300 LFM

200 LFM

5

100 LFM

0

1

3

6

9

12

15

18

21

24

27

30

35

40

45

50

55

60

65

70

75

80

Load Current (Amps)

Ambient Temperature ( C)

°

UCQ-2.5/40-D24 Efficiency vs Line Voltage and Load Current @25˚ C

UCQ-2.5/40-D24 Maximum Current Temperature Derating

No baseplate, VIN = 24V (at sea level)

95

35

30

25

20

15

90

85

V

IN = 24V

80

75

70

65

60

55

50

V

IN = 18V

V

IN = 35V

10

400 LFM

300 LFM

5

200 LFM

100 LFM

0

3

6

9

12

15

18

21

24

27

30

33

36

39 40

30

35

40

45

50

55

60

65

70

75

80

Load Current (Amps)

Ambient Temperature ( C)

°

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 12 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-3.3/20-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, longitudinal airflow, no baseplate)

UCQ-3.3/20-D48 Efficiency vs Line Voltage and Load Current @25°C

95

18

15

12

9

20

90

85

18

100 LFM

200 LFM

16

14

12

10

VIN = 36V

80

75

70

65

VIN = 48V

300 LFM

6

V

IN = 75V

400 LFM

3

Power Dissipation

IN = 48V

V

0

30

35

40

45

50

55

60

65

70

75

80

85

2

5

8

11

14

17

20

Ambient Temperature (°C)

Load Current (Amps)

UCQ-3.3/30-D48 Maximum Current Temperature Derating at Sea Level

(VIN = 48V, no baseplate, airflow is from Vin to Vout)

UCQ-3.3/30-D48 Efficiency vs Line Voltage and Load Current @25°C

95

15

12

9

30

28

26

90

85

VIN = 36V

24

100 LFM

VIN = 48V

22

200 LFM

80

75

70

6

VIN = 75V

20

300 LFM

400 LFM

Power Dissipation

3

18

VIN = 48V

16

30

35

40

45

50

55

60

65

70

75

80

85

0

Ambient Temperature (°C)

3

6

9

12

15

18

21

24

27

30

Load Current (Amps)

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 13 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-3.3/35-D24 Efficiency vs Line Voltage and Load Current @25˚ C

92

90

88

86

84

82

80

78

76

74

72

70

VIN = 36V

VIN = 24V

VIN = 18V

3

5

7

9

11

15

17

19

21

23

25

27

29

31

33

35

Load Current (Amps)

UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level

(V^IN= 24V, with baseplate, airflow is from -Vin to +Vin)

(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)

40

35

30

25

20

40

35

30

25

20

400 LFM

300 LFM

15

10

5

15

10

5

200 LFM

300 LFM

200 LFM

100 LFM

Natural Convection

0

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 (°C)

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 14 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-3.3/40-D48 Efficiency and Power Dissipation @25˚ C

95

90

85

80

75

70

65

60

55

50

45

22

20

18

16

14

12

10

8

VIN = 75V

V

IN = 48V

V

IN = 36V

6

4

Power Dissipation

IN = 48V

2

V

40

4

0

8

12

16

20

24

28

32

36

40

Load Current (Amps)

UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, with baseplate, transverse airflow)

(VIN = 48V, no baseplate, transverse airflow)

50

40

30

40

30

400 LFM

20

300 LFM

400 LFM

300 LFM

200 LFM

100 LFM

10

Natural Convection

100 LFM

Natural Convection

0

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 ( C)

°

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 15 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-5/20-D24 Efficiency and Power Dissipation @25°C

96

92

88

84

80

76

72

68

64

60

14

12

10

8

V

IN = 18V

VIN = 24V

6

V

IN = 36V

4

Power Dissipation

IN = 24V

V

2

0

3

4

5

6

7

8

9

10 11 12 13 14 15 16 17 18 19 20

Load Current (Amps)

UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level

(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)

(V^IN= 24V, with baseplate, airflow is from -Vin to +Vin)

22

20

18

16

25

20

14

100 LFM

15

12

200 LFM

10

8

6

4

2

0

300 LFM

400 LFM

5

0

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 (°C)

UCQ-5/20-D48 Maximum Current Temperature Derating at Sea Level

(VIN = 48V, no baseplate, airflow is from -Vin to +Vin)

UCQ-5/20-D48

Efficiency vs Line Voltage and Load Current @25°C

22

20

18

16

95

90

85

100 LFM

14

200 LFM

12

300 LFM

10

VIN = 36V

400 LFM

8

80

75

70

VIN = 50V

6

4

2

0

V

IN = 75V

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature (°C)

4

6

8

10

12

14

16

18

20

Load Current (Amps)

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 16 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-5/25-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, no baseplate, airflow is from Vin to Vout)

UCQ-5/25-D48 Efficiency and Power Dissipation @25˚ C

95

18

16

14

12

10

8

30

25

20

90

85

VIN = 75V

V

IN = 48V

80

75

70

65

60

55

50

V

IN = 36V

15

400 LFM

300 LFM

6

10

200 LFM

100 LFM

4

5

0

Power Dissipation

2

VIN = 48V

0

30

35

40

45

50

55

60

65

70

75

80

85

3

5

7

9

11

13

15

17

19

21

23

25

Ambient Temperature ( C)

Load Current (Amps)

°

UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, no baseplate, airflow is from Vin to Vout)

UCQ-12/8.3-D48 Efficiency and Power Dissipation @25˚ C

100

20

9

8

7

6

5

95

90

85

18

16

14

12

10

8

V

IN = 75V

80

75

70

65

60

55

50

V

IN = 48V

400 LFM

4

3

2

1

0

V

IN = 36V

300 LFM

200 LFM

6

100 LFM

4

Power Dissipation

IN = 48V

V

2

0

8.3

0.8

1.6

2.4

3.2

4

4.8

5.6

6.4

7.2

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature ( C)

°

Load Current (Amps)

UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, with baseplate, longitudinal airflow)

10

9

8

100 LFM

200 LFM

7

300 LFM

400 LFM

6

5

4

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature ( C)

°

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 17 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level

(V^IN= 48V, no baseplate, airflow is from Vin to Vout)

UCQ-15/6.7-D48 Efficiency and Power Dissipation @Ta = 25˚ C

100

15

14

13

12

11

10

9

95

90

85

6.5

100 LFM

200 LFM

300 LFM

V

IN = 75V

80

75

70

65

60

55

50

400 LFM

5.5

4.5

3.5

VIN = 48V

8

7

VIN = 36V

6

5

4

Power Dissipation

3

V

IN = 48V

2

1

30

35

40

45

50

55

60

65

70

75

80

85

1.2

1.7 2.2

2.7

3.2

3.7 4.2

4.7

5.2

5.7 6.2

6.7

Ambient Temperature ( C)

°

Load Current (Amps)

UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level

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

6.5

100 LFM

5.5

4.5

3.5

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature ( C)

°

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 18 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TYPICAL PERFORMANCE CURVES

5#1ꢀꢁꢂꢁꢃꢁꢄꢀ$ꢅꢆ /UTPUT 4RANSIENT 2ESPONSE

ꢀ6). ꢁ ꢂꢃ6ꢄ RESISTIVE LOAD STEP ꢅꢆꢇ TO ꢆꢈꢇꢉ

5#1ꢀꢁꢂꢁꢃꢁꢄꢀ$ꢅꢆ /UTPUT 4RANSIENT 2ESPONSE

ꢀ6). ꢁ ꢂꢃ6ꢄ RESISTIVE LOAD STEP ꢆꢈꢇ TO ꢅꢆꢇꢉ

ꢊꢈꢈ§SECꢋDIV

5#1ꢀꢁꢂꢁꢃꢁꢄꢀ$ꢅꢆ %NABLE /Nꢃ/FF

ꢀ6). ꢁ ꢂꢃ6ꢄ )/54 ꢁ ꢌꢈ!ꢉ

5#1ꢀꢁꢂꢁꢃꢁꢄꢀ$ꢅꢆ 2IPPLE AND .OISE

ꢀ6). ꢁ ꢂꢃ6ꢄ )/54 ꢁ ꢌꢈ! RESISTIVEꢄ OUTPUT CAPS ꢊ§& CERAMIC \\ ꢊꢈ§& TANTALUMꢉ

6/54

ꢊ6ꢋDIV

#ONTROL

0IN

ꢍ6ꢋDIV

ꢍMSECꢋDIV

ꢍ§SECꢋDIV

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 19 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

MECHANICAL SPECIFICATIONS

UCQ with Optional Baseplate

0.40

(10.2)

2.30 (58.4)

A

2.30 (58.4)

A

1.860 (47.2)

A

PINS 1-3, 5-7:

0.040Ø 0.002 (1.016 0.05)

PINS 4, 8:

0.015 minimum

clearance between

standoffs and

#M3 THD. X 0.15 DEEP

TYPICAL 4 PL.

0.18

(4.6)

0.062Ø 0.002 (1.575 0.05)

highest component

SCREW LENGTH MUST

NOT GO THROUGH BASEPLATE

2.00 (50.8)

A

4

1

2

3

0.50

(12.7)

5

6

7

8

0.600

(15.2)

Case C67

0.300

(7.6)

BOTTOM VIEW

PINS 1-3, 5-7:

0.040Ø 0.002 (1.016 0.05)

PINS 4, 8:

0.600 (15.24)

4 EQ. SP.

0.18

(4.6)

0.062Ø 0.002 (1.575 0.05)

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

Component locations may vary between units.

Third Angle Projection

DOSA-Compatible I/O Connections

1

Function P32

−Input*

5

Function P32

−Sense

Standard pin length is shown. Please refer to the Part

Number Structure for special order pin lengths.

2

Remote On/Off

+Input*

6

Output Trim

+Sense

3

7

Tolerances (unless otherwise speciﬁed):

.XX 0.02 (0.5)

4

−Output

8

+Output

*

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

units. Other units may use different pin numbering or alternate

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

.XXX 0.010 (0.25)

Angles 2ꢀ

Components are shown for reference only.

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

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 20 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

TECHNICAL NOTES

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 UCQ 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 UCQ 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 2) 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 2, 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.

3

1

+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 < 700m: @ 100kHz

BUS = 220μF, ESR < 100mW @ 100kHz

C

L

BUS = 12μH

Figure 2. 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 UCQ 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 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.

Floating Outputs

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

respect to their input. Designers will normally use the –Output (pin 4) as the

ground/return of the load circuit. You can however, use the +Output (pin 8) as

ground/return to effectively reverse the output polarity.

Input Source Impedance

The input of UCQ converters must be driven from a low ac-impedance source.

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

highly inductive source impedances. The input circuit shown in Figure 2 is a

practical solution that can be used to minimize the effects of inductance in the

input traces. For optimum performance, components should be mounted close

to the DC/DC converter.

Minimum Output Loading Requirements

UCQ 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/support

MDC_UCQ Models.B20 Page 21 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

Remote Sense

7

8

COPPER STRIP

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. UCQ 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.

+SENSE

+OUTPUT

RLOAD

SCOPE

C1

C2

4

5

–OUTPUT

–SENSE

COPPER STRIP

C1 = 1μF CERAMIC

C2 = 10μF TANTALUM

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

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

Figure 3. Measuring Output Ripple/Noise (PARD)

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:

Thermal Shutdown

The UCQ 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 UCQ 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) d rated output power

#ONTACT AND 0#" RESISTANCE

LOSSES DUE TO )2 DROPS

ꢃ

ꢊ

ꢎ/54054

n).054

)/54

ꢅ

ꢎ3%.3%

Current Limiting

3ENSE #URRENT

ꢍ

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

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

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.

/.ꢋ/&&

#/.42/,

ꢏ

ꢆ

42)-

n3%.3%

,/!$

3ENSE 2ETURN

)/54 2ETURN

ꢌ

ꢂ

ꢎ).054

n/54054

#ONTACT AND 0#" RESISTANCE

LOSSES DUE TO )2 DROPS

Figure 4. Remote Sense Circuit Conﬁguration

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 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 UCQ Series is capable of enduring an

indeﬁnite short circuit output condition.

Trimming Output Voltage

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

output voltage (refer to the trim equations and trim graphs that follow). Adjust-

ments to the output voltage can be accomplished via a trim pot (Figure 5) or

a single ﬁxed resistor as shown in Figures 6 and 7. A single ﬁxed resistor can

increase or decrease the output voltage depending on its connection. Resistors

should be located close to the converter and have TCR’s less than 100ppm/°C

to minimize sensitivity to changes in temperature. If the trim function is not

used, leave the trim pin open.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 22 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7)

will increase the output voltage. A resistor connected from the Trim Pin (pin 6)

to the –Sense (pin 5) will decrease the output voltage.

ꢃ

ꢊ

ꢍ

ꢎ/54054

n).054

ꢅ

ꢏ

ꢆ

ꢂ

ꢎ3%.3%

42)-

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 V^OUTand Sense, in conjunction with trim adjust-

ment of the output voltage, can cause the over-voltage protection circuitry to

activate (see Performance Speciﬁcations for over-voltage limits). 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 converter’s

speciﬁed rating, or cause output voltages to climb into the output over-voltage

region. Therefore:

/.ꢋ/&&

#/.42/,

,/!$

2^{42)- $/7.}

n3%.3%

n/54054

ꢌ

ꢎ).054

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

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

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

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

ꢃ

ꢊ

ꢎ/54054

n).054

ꢅ

ꢎ3%.3%

Trim Equations

(For all models except the UCQ-1.2/40-D24 and -1.2/30-D48)

ꢆꢐꢍꢍ

452.3

ꢏ

ꢆ

ꢂ

ꢍ

ꢌ

/.ꢋ/&&

#/.42/,

42)-

n3%.3%

,/!$

Trim Down

Trim Up

Connect trim resistor between

trim pin and −Sense

trim pin and +Sense

ꢎ).054

5.11 × VNOM × (1+')

1.225 × '

5.11

'

− 5.11

n/54054

R

_TrimDn(k Ω) =

R_TrimUp(k Ω) =

− 10.22

'

Figure 5.Trim Connections Using A Trimpot

Where,

' = | (V^NOM− VOUT) / VNOM |

VNOM is the nominal, untrimmed output voltage.

V^OUTis the desired new output voltage.

ꢃ

ꢊ

ꢎ/54054

n).054

ꢅ

ꢏ

ꢆ

ꢂ

ꢎ3%.3%

42)-

Do not exceed the speciﬁed trim range or maximum power ratings

when adjusting trim. Use 1% precision resistors mounted close

to the converter on short leads.

ꢍ

ꢌ

/.ꢋ/&&

#/.42/,

,/!$

2^{42)- 50}

(For the UCQ-1.2/40-D24 and -1.2/30-D48)

n3%.3%

n/54054

Trim Down

Trim Up

Connect trim resistor between

ꢎ).054

trim pin and −Sense

trim pin and +Sense

5.11 × VNOM × (1+')

5.11

2' − 2

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

R

_TrimDn(k Ω) =

R_TrimUp(k Ω) =

1.225 × '

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 23 of 24

Single Output UCQ Models

Low-Proﬁle, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

On/Off Control

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.

The input-side, remote On/Off Control function (pin 2) can be ordered to operate

with either polarity:

Positive (no sufﬁx) polarity models are enabled when pin 2 is left open (or

is pulled high, applying +3.5V to +13.5V with respect to –Input, pin 1) as per

Figure 8. Positive-polarity devices are disabled when pin 2 is pulled low (0 to

0.8V with respect to –Input).

Negative (“N” sufﬁx) polarity devices are off when pin 2 is left open (or

pulled high, applying +3.5V to +13.5V), and on when pin 2 is pulled low (0 to

1V) with respect to –Input as shown in Figure 9.

+INPUT

3

+INPUT

3

2

+VCC

+Vcc

13V CIRCUIT

2

ON/OFF

CONTROL

ON/OFF

CONTROL

5V CIRCUIT

1

–INPUT

1

–INPUT

Figure 8. Driving the Negative Polarity On/Off Control Pin

(simpliﬁed circuit)

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

(simpliﬁed circuit)

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

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/

Murata Power Solutions, Inc.

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

ISO 9001 and 14001 REGISTERED

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

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

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

notice.

www.murata-ps.com/support

MDC_UCQ Models.B20 Page 24 of 24


型号：	UCQ-1.2/40-D24PBH-C
厂家：	muRata
描述：	DC-DC Regulated Power Supply Module, 1 Output, 48W, Hybrid, ROHS COMPLIANT, QUARTER BRICK PACKAGE-8
文件：	总24页 (文件大小：549K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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