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NPH15S Series
Isolated 15W Single Output DC/DC Converters
FEATURES RoHS compliant High efficiency to 89% Power density up to 2.4W/cm3 UL 94V-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 40ºC without
heatsink Operation to zero load Protected against load faults Internal over temperature protection Uses no electrolytic capacitors
DESCRIPTION
The NPH15S 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 heatsinking, 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 recognised by Underwriters Laboratory (UL) to UL 1950 for operational insulation, file number E151252 applies.
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SELECTION GUIDE
Order Code1
Nominal Input Voltage
V
NPH15S2403EiC
24
NPH15S2403iC
24
NPH15S2405EiC
24
NPH15S2405iC
24
NPH15S2412EiC
24
NPH15S2412iC
24
NPH15S2415EiC
24
NPH15S2415iC
24
NPH15S4803EiC
48
NPH15S4803iC
48
NPH15S4805EiC
48
NPH15S4805iC
48
NPH15S4812EiC
48
NPH15S4812iC
48
NPH15S4815EiC
48
NPH15S4815iC
48
Output Voltage
V 3.4 3.4 5.1 5.1 12.1 12.1 15.1 15.1 3.4 3.4 5.1 5.1 12.1 12.1 15.1 15.1
Output Current
A 4.4 4.4 3.0 3.0 1.3 1.3 1.0 1.0 4.4 4.4 3.0 3.0 1.3 1.3 1.0 1.0
Current Limit
Efficiency
A (Min.) 7.5 7.5 5.0 5.0 2.5 2.5 2.0 2.0 7.5 7.5 5.0 5.0 2.5 2.5 2.0 2.0
A (Max.) 11.0 11.0 7.5 7.5 3.7 3.7 3.0 3.0 11.0 11.0 7.5 7.5 3.7 3.7 3.0 3.0
% 81 81 84 84 86 86 87 87 83 83 85 85 88 88 89 89
MTTF2
kHrs 335 335 286 286 286 286 281 281 295 295 301 301 302 302 296 296
INPUT CHARACTERISTICS
Parameter
Conditions
Voltage range
Continuous operation, 24V input types Continuous operation, 48V input types
Min. Typ. Max. Units
18 24 36 36 48 75
V
OUTPUT CHARACTERISTICS
Parameter
Conditions
Voltage set point error
50% load
Overall voltage error
Case temperature -40ºC to 110ºC Load 0% - 100% Input specified range
Temperature coefficient of output voltage (slope)
Deviation of output voltage
Temperature MIN-MAX
Line regulation Load Regulation Ripple
Operating voltage range, 50% load 0% - 100% rated load rms
Min. Typ. Max. Units 0.5 %
2.5 %
250 ppmºC
0.5 1
%
0.1 % 0.5 % 70 mV
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation test voltage
Flash tested for 1 second
Resistance
VISO = 500VDC
Min. Typ. Max. Units 1500 VDC
1 GΩ
ABSOLUTE MAXIMUM RATINGS Input voltage, 24V input types Input voltage, 48V input types Output voltage Output trim control Synchronisation/shutdown control
-0.5V to 40V 3 -0.5V to 80V 3 -0.3V to regulated voltage -1V to +30V ±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 TA=25°C, nominal input voltage and rated output current unless otherwise specified.
KDC_NPH15S.F05 Page 1 of 8
NPH15S Series
Isolated 15W Single Output DC/DC Converters
CONTROL CHARACTERISTICS
Parameter
Conditions
Min. Typ. Max. Units
Voltage trimming range1
At rated load, trim control at either output
±10
%
Remote switch input (voltage relative to Not operating
input negative)1
Operating, open circuit voltage
-15 0 1.5 9 10 11
V
Start delay
Time from application of valid input voltage to output being in specification
25 50 ms
Synchronisation1
Specified drive signal
320 440 kHz
Switching frequency
330 350 395 kHz
TEMPERATURE CHARACTERISTICS Parameter Case temperature Storage Relative humidity Thermal protection
Conditions Full load Absolute Max. internal temperature Non condensing 85ºC Operates at case temperature
Min. Typ. Max. Units -40 110
ºC -40 125
85 % 110 ºC
THERMAL CHARACTERISTICS
UL 1950 recognition: Max. permissable loads for a given ambient temperature for any NPH15S model.
Temperature (ºC) 40 50 53 60
Power (W) 15.0 15.0 15.0 13.7
Temperature (ºC) 70 80 85 90
Max. power rating with case temperature maintained by external means (e.g. forced air cooling).
Part Number
NPH15S2403XXX NPH15S2405XXX NPH15S2412XXX NPH15S2415XXX NPH15S4803XXX NPH15S4805XXX NPH15S4812XXX NPH15S4815XXX
100ºC 19 22 25 26 20 23 28 30
Case Temperature 105ºC 16 19 22 24 17 20 26 28
110ºC 12 15 19 21 13 16 23 25
Power (.