NPH25S2415IC_技术文档

NOT RECOMMENDED

NPH25S Series

www.murata-ps.com

Isolated 25W Single Output DC/DC Converters

S

FOR NEW DESIGN

SELECTION GUIDE

Nominal Input

Voltage

Current Limit

MTTF²

Recommended

Alternative

Order Code¹

V

3.4

A

A (Min.) A (Max.)

%

81

84

86

87

kHrs

334

290

291

290

NPH25S2403EiC

NPH25S2403iC

NPH25S2405EiC

NPH25S2405iC

NPH25S2412EiC

NPH25S2412iC

NPH25S2415EiC

NPH25S2415iC

24

7.3

5.0

2.1

1.7

7.5

5.0

2.5

2.0

11.0

7.5

UEI30-033-Q48N-C

UEI30-050-Q48N-C

UEI30-120-Q48N-C

UEI30-150-Q48N-C

FEATURES

ꢀRoHS compliant

5.1

7.5

12.1

15.1

3.7

ꢀHigh efﬁciency to 89%

ꢀPower density up to 1.78W/cm³

ꢀUL94 V-0 package material

ꢀIndustry standard pinout

ꢀUL 1950 recognized

3.7

3.0

Obsolete

NPH25S4803EiC

NPH25S4803iC

NPH25S4805EiC

NPH25S4805iC

NPH25S4812EiC

NPH25S4812iC

NPH25S4815EiC

NPH25S4815iC

48

3.4

7.3

5.0

2.1

1.7

7.5

5.0

2.5

2.0

11.0

7.5

83

85

88

89

369

366

368

366

UEI25-033-D48P-C

UEI25-050-D48P-C

UEI25-120-D48P-C

Contact Murata

5.1

ꢀNon latching current limit

ꢀConstant 350kHz frequency

ꢀ1.5kV input to output isolation

ꢀVersatile control options

5.1

7.5

12.1

15.1

3.7

3.0

Contact Murata

ꢀContinuous rating to 30W at 60ºC without

heatsink

INPUT CHARACTERISTICS

Parameter

Conditions

Continuous operation, 24V input types

Continuous operation, 48V input types

Min.

18

36

Typ.

24

48

Max.

36

75

Units

V

ꢀOperation to zero load

Voltage range

ꢀProtected against load faults

ꢀInternal over temperature protection

ꢀUses no electrolytic capacitors

OUTPUT CHARACTERISTICS

Parameter

Voltage set point error

Conditions

50% load

Min.

Typ.

Max.

0.5

Units

%

DESCRIPTION

Case temperature -40ºC to 110ºC

Load 0% - 100%, Input speciﬁed range

Overall voltage error

2.5

%

The NPH25S series of DC/DC converters combines

ease of application with versatility. The pin pattern

is based on the popular industry standard, but two

additional pins may optionally be ﬁtted to provide

a variety of features not commonly found on units

of this type. High efﬁciency enables full rating to

be achieved in a small package without heat-

sinking, and a high surge capability will provide

for start-up and transient loads, whilst being

thermally protected against sustained overload.

Overload protection of the “constant current” type

ensures start-up into complex load conditions. The

copper case achieves efﬁcient heat transfer and

screening. The product range has been recog-

nised by Underwriters Laboratory (UL) to UL 1950

for operational insulation, ﬁle number E151252

applies.

Temperature coefﬁcient of

output voltage (slope)

250

ppmºC

%

Deviation of output voltage

Line regulation

Load Regulation

Ripple

Temperature MIN-MAX

Operating voltage range, 50% load

0% - 100% rated load

rms

0.5

70

1

0.1

0.5

%

mV

ISOLATION CHARACTERISTICS

Parameter

Isolation test voltage

Resistance

Conditions

Flash tested for 1 second

VISO = 500VDC

Min.

1500

1

Typ.

Max.

Units

VDC

GΩ

ABSOLUTE MAXIMUM RATINGS

Input voltage, 24V input types

Input voltage, 48V input types

Output voltage

-0.5V to 40V³

-0.5V to 80V³

-0.3V to regulated voltage

-1V to +30V

Output trim control

Synchronisation/shutdown control

15V relative to input return

1. Parts ending with EiC have optional TRIM and SS pins ﬁtted.

For full details go to

www.murata-ps.com/rohs

2. Calculated using MIL-HDBK-217F with nominal input voltage at full load.

3. Absolute maximum value for 30 seconds. Prolonged operation may damage the product.

All speciﬁcations typical at T =25°C, nominal input voltage and rated output current unless otherwise speciﬁed.

A

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KDC_NPH25S.H01 Page 1 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

CONTROL CHARACTERISTICS

Parameter

Voltage trimming range¹

Conditions

At rated load, trim control at either output

Min.

10

Typ.

Max.

Units

%

Not operating

-15

9

0

1.5

11

Remote switch input (voltage relative to

input negative)¹

V

Operating, open circuit voltage

10

Time from application of valid input voltage to output being in speciﬁ-

cation

Start delay

25

50

ms

Synchronisation¹

Speciﬁed drive signal

320

330

440

395

kHz

Switching frequency

350

TEMPERATURE CHARACTERISTICS

Parameter

Case temperature

Conditions

Full load

Min.

-40

Typ.

Max.

110

125

85

Units

ºC

Storage

Absolute Max. internal temperature

Non condensing 85ºC

Operates at case temperature

-40

Relative humidity

%

ºC

Thermal protection

110

THERMAL CHARACTERISTICS

UL 1950 recognition: Max. permissable loads for a given ambient temperature for any NPH25S model.

Temperature (ºC)

Power (W)

25.0

22.2

19.4

16.6

Temperature (ºC)

Power (W)

13.9

12.5

40

50

60

70

80

85

90

11.1

Max. power rating with case temperature maintained by external means (e.g. forced air cooling).

Case Temperature

105ºC

Part Number

Units

100ºC

24

110ºC

15

NPH25S2403XXX

NPH25S2405XXX

NPH25S2412XXX

NPH25S2415XXX

NPH25S4803XXX

NPH25S4805XXX

NPH25S4812XXX

NPH25S4815XXX

20

22

24

27

20

24

29

30

25

18

W

30

21

30

22

25

16

25

20

30

24

30

26

THERMAL PERFORMANCE

24V Input

48V Input

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1. Optional - where ﬁtted.

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KDC_NPH25S.H01 Page 2 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

APPLICATION NOTES

OUTPUT VOLTAGE ADJUSTMENT

The trim resistor equations are:

V^NOM

S

3.4

5.1

12.1

15.1

Rup = (R/Vup) - S kΩ

T

22.2973

10.1351

17.9994

-1.6241

20.59761

9.36255

24.49487

-2.48374

28.79096

15.42373

94.9661

-5.942857

39.95902

20.77869

147.7314

-7.990244

T

Rdown = (L x

) - T - S kΩ

V^down

R

L

TRIM UP

TRIM DOWN

+VOUT

-VOUT

+VIN

TRIM

R^DOWN

NPH25S

R^UP

TRIM

-VOUT

When the output voltage is trimmed up, output current must be derated so that the maximum output power is not exceeded.

Example to decrease output voltage of NPH25S4805EiC by 0.1V:

-2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18kΩ

RDOWN =

(

)

-0.1

SET VOLTAGE

The output voltage of all units is set to 100mV above nominal, to offset resistive losses and thus assist with worst case error calculations. For the EiC versions, this

allowance can be altered with a single ﬁxed resistor, connected from the trimming pin to one of the output pins.

SHUTDOWN

FREQUENCY CONTROL

When the shutdown pin (SS) is shorted to the negative input, the converter will

stop. Its current consumption will then be less than 1mA at nominal supply

voltage. The voltage must be less than 1.5V to ensure that the unit stops, and

must be able to sink at least 1mA.

If the primary side dc control voltage is pulled away from its open circuit

voltage, the converter frequency will be changed, approximately in proportion

to the voltage. With +8.5VDC voltage to SS pin, the typical switching frequency

will be 300kHz. If this is raised to 15VDC, the switching frequency will typically

be 510kHz. The frequency may thus be moved away from a sensitive value or

into a safe area. Deviation of at least –10% to +30% is achievable, though the

efﬁciency will decline with signiﬁcant changes. Also note that if the frequency

is lowered, the switching frequency component of output ripple will increase.

Since the design uses no large electrolytic capacitors, any use of a lower

frequency must allow for the effects of increased ripple. Additional external

ﬁltering may be required.

The unit will restart if the control pin is left open circuit or raised to a value

close to its normal open circuit voltage. This is typically 10V. Note however,

that the unit will not meet speciﬁcation while a signiﬁcant current drain from

this pin remains.

If the shutdown pin is to be connected to a long wire, it is recommended that a

capacitor decouples the pin to the supply common in order to avoid the risk of

injecting noise into the converter circuit. A series resistor may also be helpful.

Values of 10nF and 1kΩ may be used.

Many NPH series converters may be switched together simply by linking the

primary control pins. The primary common pins must also be linked.

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KDC_NPH25S.H01 Page 3 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

APPLICATION NOTES (continued)

SYNCHRONIZATION

The converter frequency may be synchronised to an external frequency by connecting a negative going pulse to the SS pin. The drive signal is typically

8V to 12V amplitude and 100ns to 200ns duration. A suitable circuit consists of a CMOS timer (TLC555) connected as an oscillator or as a pulse shaper.

Its logic output (not the discharge output) should be connected via a 4.7nF capacitor to the converter pin. The synchronised frequency is above the free

running value. However, the free running frequency can be lowered, so that sychronisation may include frequencies near or below the natural value. An

example of a practical circuit is shown below, which uses a zener diode to lower the natural frequency. Several converters of this family may be syn-

chronised from the same reference provided the waveform can be maintained by the use of an adequate driver circuit. If the rise time is more than 20ns,

for example, synchronisation may not be achieved over the speciﬁed frequency range.

For best efﬁciency, set the frequency within the speciﬁed range of its natural state.

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07

TECHNICAL NOTES

ISOLATION VOLTAGE

‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,

applied for a speciﬁed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.

Murata Power Solutions NPH25S series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1500 VDC for 1 second.

A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”

The NPH25S series has been recognized by Underwriters Laboratory, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC.

The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be

expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded

as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard

requirements.

REPEATED HIGH-VOLTAGE ISOLATION TESTING

It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materi-

als, construction and environment. While manufactured parts can withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any

material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of

tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from

speciﬁed test voltage.

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KDC_NPH25S.H01 Page 4 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

EMC FILTERING AND SPECTRA

FILTERING

The module includes a basic level of ﬁltering, sufﬁcient for many applications. Where lower noise levels are desired, ﬁlters can easily be added to achieve any required

noise performance.

A DC/DC converter generates noise in two principle forms: that which is radiated from its body and that conducted on its external connections. There are three separate

modes of conducted noise: input differential, output differential and input-output.

This last appears as common mode at the input and the output, and cannot therefore be removed by ﬁltering at the input or output alone. The ﬁrst level of ﬁltering is to

connect a capacitor between input and output returns, to reduce this form of noise. It typically contains high harmonics of the switching frequency, which tend to appear

as spikes on surrounding circuits. The voltage rating of this capacitor must match the required isolation voltage. (Due to the great variety in isolation voltage and required

noise performance, this capacitor has not been included within the converter.)

Input ripple is a voltage developed across the internal Input decoupling capacitor. It is therefore measured with a deﬁned supply source impedance. Although simple series

inductance will provide ﬁltering, on its own it can degrade the stability. A shunt capacitor is therefore recommended across the converter input terminals, so that it is fed

from a low impedance.

If no ﬁltering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capacitor for stability. An electrolytic will perform

well in these situations. The input-output ﬁltering is performed by the common-mode choke on the primary. This could be placed on the output, but would then degrade the

regulation and produce less beneﬁt for a given size, cost, and power loss.

Radiated noise is present in magnetic and electrostatic forms. The latter is suppressed by the metal case, which is connected to the output return, typically a zero-volt

point. Thanks to the small size of these units, neither form of noise will be radiated “efﬁciently”, so will not normally cause a problem. Any question of this kind usually

better repays attention to conducted signals.

EMC FILTER AND VALUES TO OBTAIN SPECTRA AS SHOWN

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Component reference

C1

C2

C3

C4

L1

L2

L3

MPS 18R333C

33μH 2A

10μF 100V

2.2μF 63V

47μF 63V

10μF 25V

4.7μH

NPH25S2403

NPH25S2405

NPH25S2412

NPH25S2415

NPH25S4803

NPH25S4805

NPH25S4812

NPH25S4815

MPS 18R333C

33μH 2A

10μF 100V

2.2μF 63V

47μF 63V

10μF 25V

10μH

MPS 18R333C

33μH 2A

MPS 49330C

33μH 2.5A

2.2μF 63V

Not required

47μF 63V

MPS 18R333C

33μH 2A

MPS 18R333C

33μH 2.00A

2.2μF 63V

MPS 18R104C

100μH 1.2A

MPS 18R104C

100μH 1.2A

MPS 18R104C

100μH 1.2A

MPS 18R104C

100μH 1.2A

Not required

4.7μH

10μH

MPS 49330C

33μH 2.5A

MPS 18R333C

33μH 2.00A

C1, C2 & C4 : Electrolytic capacitors

C3 : Polyester or ceramic capacitor

EMC Spectra red limit line is EN 55022 curve B Quasi-peak average limit.

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KDC_NPH25S.H01 Page 5 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

EMC FILTERING AND SPECTRA (continued)

NPH25S2403

NPH25S2405

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NPH25S2412

NPH25S2415

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NPH25S4803

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NPH25S4805

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www.murata-ps.com/support

KDC_NPH25S.H01 Page 6 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

EMC FILTERING AND SPECTRA (continued)

NPH25S4812

NPH25S4815

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RoHS COMPLIANCE INFORMATION

This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination

ﬁnish on this product series is a Gold ﬂash (0.05-0.10 micron) over Nickel Preplate. The series is backward compatible with Sn/Pb soldering

systems. For further information, please visit www.murata-ps.com/rohs

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KDC_NPH25S.H01 Page 7 of 8

NPH25S Series

Isolated 25W Single Output DC/DC Converters

PACKAGE SPECIFICATIONS

MECHANICAL DIMENSIONS

PIN CONNECTIONS

1.969 (50.00)

Function

1

2

-VIN

+VIN

SS

NPH25S2412iC

XYYWW

3*

4

1.378 (35.00)

+V^OUT

TRIM

-V^OUT

5*

6

* Optional pins

0.394 (10.00)

RECOMMENDED FOOTPRINT DETAILS

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0.041 (1.04)

0.035 (0.90)

Ø

0.29 (7.34)

ꢑ

4

3

*

2

1

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5

*

6

0.800 (20.32)

0.584 (14.84)

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Weight: 45g

All dimensions in inches 0.01 (mm 0.25mm)

All pins on a 0.10 (2.54) pitch and within 0.01 (0.254) of true position

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* Optional control pins

The copper case is internally connected to the output (-V^OUT) pin. Care is needed in the design of this circuit board on which

the converter is mounted. Top side tracks must not contact the edge of the case on the underside of the unit.

All dimensions in inches 0.01 (mm 0.25mm)

* Optional control pins

Please note that from 2010 onwards you may receive either a blue or a black case ﬁnish.

TUBE OUTLINE DIMENSIONS

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ꢆꢏꢅꢈꢊꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢁꢋꢆꢏꢐꢅꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢂ

ꢃꢅꢏꢊꢅ

ꢌꢅꢏꢈꢅ

ꢃꢅꢏꢅꢉꢆ

ꢉꢏꢇꢈꢐꢅꢏꢅꢆꢆꢀꢁꢄꢆꢏꢐꢅꢅꢏꢋꢋꢂ

ꢅꢏꢄꢅꢇꢀꢁꢉꢅꢏꢊꢅꢂ

ꢅꢏꢅꢊꢊꢅꢏꢅꢅꢇꢀꢁꢅꢏꢈꢋꢅꢏꢉꢋꢂ

All dimensions in inches 0.01 (mm 0.25mm)

Tube length: 530 (20.866) 2 (0.079)

Tube material: Antistatic coated clear PVC

Tube Quantity: 15

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

KDC_NPH25S.H01 Page 8 of 8


型号：	NPH25S2415IC
厂家：	muRata
描述：	Isolated 25W Single Output DC/DC Converters
文件：	总8页 (文件大小：265K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

NPH25S2415IC [MURATA]

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