NPH25S4805EIC [MURATA]
民用设备,工业设备;NPH10S Series
Isolated 10W Single Output DC/DC Converters
SELECTION GUIDE
Current
Limit2 (Typ.)
Order Code1
V
V
3.4
A
A
%
79
79
83
83
86
86
86
86
80
80
83
83
μF
kHrs
279
279
275
275
259
259
243
243
317
317
312
312
NPH10S2403EiC
NPH10S2403iC
NPH10S2405EiC
NPH10S2405iC
NPH10S2412EiC
NPH10S2412iC
NPH10S2415EiC
NPH10S2415iC
NPH10S4803EiC
NPH10S4803iC
NPH10S4805EiC
NPH10S4805iC
24
24
24
24
24
24
24
24
48
48
48
48
2.94
2.94
1.96
1.96
0.83
0.83
0.67
0.67
2.94
2.94
1.96
1.96
4.3
4.3
3.1
3.1
1.2
1.2
1.1
1.1
4.1
4.1
2.8
2.8
470
470
470
470
100
100
47
3.4
5.1
FEATURES
ꢀRoHS compliant
5.1
12.1
12.1
15.1
15.1
3.4
ꢀHigh efficiency to 87%
ꢀPower density up to 1.5Wcm3
ꢀUL1950 recognized
47
470
470
470
470
3.4
ꢀIndustry standard pinout
ꢀSurge rating to 12W
ꢀNon latching current limit
ꢀ1.5kV input to output isolation
ꢀVersatile control options
5.1
5.1
Recommended
Alternative
Obsolete
NPH10S4812EiC
NPH10S4812iC
NPH10S4815EiC
NPH10S4815iC
48
48
48
48
12.1
12.1
15.1
15.1
0.83
0.83
0.67
0.67
1.3
1.3
1.0
1.0
86
86
87
87
56
56
22
22
291
291
272
272
UEI15-120-Q48P-C
UEI15-120-Q48P-C
UEI15-150-Q48P-C
UEI15-150-Q48P-C
ꢀContinuous rating to 10W at 72ºC without
heatsink
INPUT CHARACTERISTICS
ꢀOperation to zero load
Parameter
Conditions
Min.
18
36
Typ.
24
48
Max.
36
75
Units
V
ꢀProtected against load faults
ꢀInternal over temperature protection
ꢀUses no electrolytic capacitors
ꢀFixed frequency
Continuous operation, 24V input types
Continuous operation, 48V input types4
Voltage range
OUTPUT CHARACTERISTICS
Parameter
Conditions
Min.
Typ.
Max.
0.5
Units
%
Voltage set point error
50% load after 30 mins at nominal sup-
ply voltage
ꢀNo external components required
Case temperature -40ºC to 110ºC
Load 0% - 100%
Input specified range
DESCRIPTION
Overall voltage error
1
2.5
%
The NPH10S 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. Thermally protected against sustained
overload. The copper case achieves efficient heat
transfer and screening. The product range has
been recognised by Underwriters Laboratory (UL)
to UL 1950 for operational insulation, file number
E151252 applies.
Temperature coefficient of
output voltage (slope)
Over any 10ºC span within the specified
temperature range
50
250
1
ppmºC
%
Deviation of output voltage
Specified over temperature MIN-MAX
0.5
Line regulation
Load Regulation
Ripple
Operating voltage range, 50% load
0% - 100% rated load5
rms
0.05
0.1
0.5
%
%
70
mV
ABSOLUTE MAXIMUM RATINGS
Input voltage, 24V input types
Input voltage, 48V input types
Output voltage
-0.5V to 40V6
-0.5V to 80V6
-0.3V to controlled output voltage (operating or non-operating)
-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.
2. Current is quoted when output is 95% of regulated voltage.
3. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
4. For applications requiring UL 1950 recognition, input voltage must not exceed 60VDC.
5. A minimum load of 10% of rating is recommended for typical applications.
6. Absolute maximum value for 30 seconds. Prolonged application may damage the product.
For full details go to
www.murata-ps.com/rohs
All specifications typical at T =25°C, nominal input voltage and rated output current unless otherwise specified.
A
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KDC_NPH10SC.J03 Page 1 of 8
NPH10S Series
Isolated 10W 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
%
For shutdown
-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
ms
Synchronisation1
Specified drive signal
320
330
440
395
kHz
kHz
Switching frequency
350
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Conditions
Flash tested for 1 second
Min.
1500
1
Typ.
Max.
Units
VDC
GΩ
Resistance
VISO = 500VDC
3.3V and 5V output
12V and 15V output
50
90
Capacitance
pF
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
Max. power rating with case temperature maintained by external means (e.g. forced air cooling).
Case Temperature
Part Number
Units
W
100ºC
10
105ºC
7.0
110ºC
2.3
3.0
4.0
4.0
1.0
1.0
0
NPH20S2403XXX
NPH10S2405XXX
NPH10S2412XXX
NPH10S2415XXX
NPH10S4803XXX
NPH10S4805XXX
NPH10S4812XXX
NPH10S4815XXX
10
8.2
10
9.5
12
9.5
10
7.0
10
4.7
W
12
8.0
12
7.5
0
THERMAL PERFORMANCE
24V Input
48V Input
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1. Optional - where fitted.
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KDC_NPH10SC.J03 Page 2 of 8
NPH10S Series
Isolated 10W Single Output DC/DC Converters
APPLICATION NOTES
OUTPUT VOLTAGE ADJUSTMENT
VNOM
S
3.4
5.1
12.1
15.1
The trim resistor equations are:
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
Rup = (R/Vup) - S kΩ
T
T
Rdown = (L x
) - T - S kΩ
Vdown
R
L
TRIM UP
TRIM DOWN
+VOUT
-VOUT
+VOUT
+VIN
+VIN
TRIM
RDOWN
NPH10S
NPH10S
RUP
TRIM
-VOUT
When the output voltage is trimmed up, output current must be derated so that the maximum output power 10W is not exceeded.
RDOWN =
Example to decrease output voltage of NPH10S4805EiC by 0.1V:
-2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18kΩ
(
)
-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 volt-
age. 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_NPH10SC.J03 Page 3 of 8
NPH10S Series
Isolated 10W Single Output DC/DC Converters
APPLICATION NOTES (continued)
SYNCHRONISATION
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
synchronised 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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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 NPH10S series of dc/dc converters are all 100% production tested at their stated isolation voltage. This is 1500V DC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NPH10S 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_NPH10SC.J03 Page 4 of 8
NPH10S Series
Isolated 10W 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
MPS 18R472C
4.7μH 5.35A
MPS 18R103C
10μH 3.45A
MPS 18R333C
33μH 2.00A
MPS 18R333C
33μH 2.00A
MPS 18R472C
4.7μH 5.35A
MPS 18R103C
10μH 3.45A
MPS 18R333C
33μH 2.00A
MPS 18R333C
33μH 2.00A
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
47μF 63V
2.2μF 63V
10μF 25V
NPH10S2403
NPH10S2405
NPH10S2412
NPH10S2415
NPH10S4803
NPH10S4805
NPH10S4812
NPH10S4815
MPS 18R333C
33μH 2A
47μF 63V
2.2μF 63V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
MPS 18R333C
33μH 2A
Not required
10μF 63V
470nF 63V
Not required
220nF 100V
220nF 100V
470nF 100V
470nF 100V
MPS 18R473C
47μH 1.65A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
47μF 100V
47μF 100V
Not required
Not required
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_NPH10SC.J03 Page 5 of 8
NPH10S Series
Isolated 10W Single Output DC/DC Converters
EMC FILTERING AND SPECTRA (continued)
NPH10S2403
NPH10S2405
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NPH10S2415
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NPH10S4803
NPH10S4805
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KDC_NPH10SC.J03 Page 6 of 8
NPH10S Series
Isolated 10W Single Output DC/DC Converters
EMC FILTERING AND SPECTRA (continued)
NPH10S4812
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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_NPH10SC.J03 Page 7 of 8
NPH10S Series
Isolated 10W Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS
1.26 (32.00)
Pin
Function
1
2
-VIN
+VIN
SS
0.98
(25.00)
NPH10S2403EiC
3*
4
XYYWW
+VOUT
TRIM
-VOUT
5*
6
0.394
(10.00)
0.177 (4.50)
0.146 (3.70)
* Optional pins
RECOMMENDED FOOTPRINT DETAILS
0.041 (1.04)
Ø
0.035 (0.90)
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0.2 (5.08)
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2
0.80
(20.32)
ꢅꢏꢅꢅꢋꢑꢄꢀꢁꢅꢏꢉꢂ
1
5
ꢐ
*
0.392 (9.96)
6
ꢅꢏꢉꢀꢁꢆꢏꢊꢄꢂ
ꢐ
0.8
(20.32)
0.23 (5.84)
Weight: 22g
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
* Optional control pins
The copper case is connected to the output (-VOUT) 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
ꢉꢏꢋꢇꢆꢀꢁꢋꢄꢏꢇꢅꢂ
ꢅꢏꢍꢋꢆꢀꢁꢉꢈꢏꢇꢅꢂ
ꢅꢏꢄꢈꢈꢀꢁꢉꢆꢏꢄꢅꢂ
ꢅꢏꢅꢋꢉꢅꢏꢅꢅꢇꢀꢁꢅꢏꢈꢅꢅꢏꢉꢊꢂ
All dimensions in inches 0.01 (mm 0.25mm)
Tube length: 20.866 (530) 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.
© 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
KDC_NPH10SC.J03 Page 8 of 8
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