NPH25S Series
Isolated 25W Single Output DC/DC Converters
KDC_NPH25S.H01 Page 1 of 8
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SELECTION GUIDE
Order Code
1
Nominal Input
Voltage
Output
Voltage
Output
Current
Current Limit
Efficiency
MTTF
2
Recommended
Alternative
V V A A (Min.) A (Max.) % kHrs
NPH25S2403EiC 24 3.4 7.3 7.5 11.0 81 334
UEI30-033-Q48N-C
NPH25S2403iC 24 3.4 7.3 7.5 11.0 81 334 UEI30-033-Q48N-C
NPH25S2405EiC 24 5.1 5.0 5.0 7.5 84 290 UEI30-050-Q48N-C
NPH25S2405iC 24 5.1 5.0 5.0 7.5 84 290 UEI30-050-Q48N-C
NPH25S2412EiC 24 12.1 2.1 2.5 3.7 86 291 UEI30-120-Q48N-C
NPH25S2412iC 24 12.1 2.1 2.5 3.7 86 291 UEI30-120-Q48N-C
NPH25S2415EiC 24 15.1 1.7 2.0 3.0 87 290 UEI30-150-Q48N-C
NPH25S2415iC 24 15.1 1.7 2.0 3.0 87 290
UEI30-150-Q48N-C
Obsolete
NPH25S4803EiC 48 3.4 7.3 7.5 11.0 83 369 UEI25-033-D48P-C
NPH25S4803iC 48 3.4 7.3 7.5 11.0 83 369 UEI25-033-D48P-C
NPH25S4805EiC 48 5.1 5.0 5.0 7.5 85 366 UEI25-050-D48P-C
NPH25S4805iC 48 5.1 5.0 5.0 7.5 85 366 UEI25-050-D48P-C
NPH25S4812EiC 48 12.1 2.1 2.5 3.7 88 368 UEI25-120-D48P-C
NPH25S4812iC 48 12.1 2.1 2.5 3.7 88 368 UEI25-120-D48P-C
NPH25S4815EiC 48 15.1 1.7 2.0 3.0 89 366 Contact Murata
NPH25S4815iC 48 15.1 1.7 2.0 3.0 89 366 Contact Murata
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
Continuous operation, 24V input types 18 24 36
V
Continuous operation, 48V input types 36 48 75
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage set point error 50% load 0.5 %
Overall voltage error
Case temperature -40ºC to 110ºC
Load 0% - 100%, Input specified range
2.5 %
Temperature coefficient of
output voltage (slope)
250 ppmºC
Deviation of output voltage Temperature MIN-MAX 0.5 1 %
Line regulation Operating voltage range, 50% load 0.1
%
Load Regulation 0% - 100% rated load 0.5
Ripple rms 70 mV
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 1500 VDC
Resistance VISO = 500VDC 1 GΩ
ABSOLUTE MAXIMUM RATINGS
Input voltage, 24V input types -0.5V to 40V
3
Input voltage, 48V input types -0.5V to 80V
3
Output voltage -0.3V to regulated voltage
Output trim control -1V to +30V
Synchronisation/shutdown control ±15V relative to input return
1. Parts ending with EiC have optional TRIM and SS pins fitted.
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
A=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
RoHS compliant
High efficiency to 89%
Power density up to 1.78W/cm
3
UL94 V-0 package material
Industry standard pinout
UL 1950 recognized
Non latching current limit
Constant 350kHz frequency
1.5kV input to output isolation
Versatile control options
Continuous rating to 30W at 60ºC without
heatsink
Operation to zero load
Protected against load faults
Internal over temperature protection
Uses no electrolytic capacitors
DESCRIPTION
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.
