NPH25S SERIES
Isolated 25W Single Output DC-DC Converters
SELECTION GUIDE
Nominal
Output
Output
Current
Input Voltage
Voltage
Efficiency
(%)
1
Order Code
(V)
24
24
24
24
48
48
48
48
(V)
3.4
5.1
12.1
15.1
3.4
5.1
12.1
15.1
(A)
7.3
5.0
2.1
1.7
7.3
5.0
2.1
1.7
NPH25S2403i
NPH25S2405i
NPH25S2412i
NPH25S2415i
NPH25S4803i
NPH25S4805i
NPH25S4812i
NPH25S4815i
81
84
86
87
83
85
88
89
FEATURES
INPUT CHARACTERISTICS
■ High Efficiency to 89%
■ Power Density up to 1.78W/cm
Parameter
Conditions
MIN
18
36
NOM
24
48
MAX
Units
3
Continuous operation, 24V input types
Continuous operation, 48V input types
36
75
Voltage Range
V
3
(28W/in )
■ 1.5kV Input to Output Isolation
■ Industry Standard Pinout
■ UL 1950 Recognised
■ Non Latching Current Limit
■ Constant 350kHz Frequency
■ Versatile Control Options
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Voltage Set
Point Error
50% load
0.5
%
Case temperature –40°C to 110°C
Load 0% - 100%
Overall
2.5
%
Voltage Error
Input specified range
Temperature Coefficient
of Output Voltage
(slope)
■ Continuous Rating to 30W at 60°C
250 ppm°C
Without Heatsink
Deviation of
■ Operation to Zero Load
Temperature MIN-MAX
0.5
70
1
%
Output Voltage
■ Protected Against All Load Faults
■ Internal Over Temperature Protection
■ Uses No Electrolytic Capacitors
■ UL 94V-0 Package Materials
Line Regulation
Load Regulation
Ripple
Operating voltage range, 50% load
0.1
0.5
%
%
mV
2
0% - 100% rated load
rms
CONTROL CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
DESCRIPTION
Voltage Trimming
At rated load,
10
%
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
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 E179522 applies.
Range
Trim control at either output
3
Remote Switch Input
(voltage relative
Not operating
-15
9
0
1.5
11
V
to input negative)
Operating, open circuit voltage
10
Time from application of valid input
Start Delay
25
50
mS
voltage to output being in specification
3
Synchronisation
Switching Frequency
Specified drive signal
320
330
440
395
kHz
kHz
350
ABSOLUTE MAXIMUM RATINGS
4
Input voltage, 24V input types
Input voltage, 48V input types
Output Voltage
Output trim control
Synchronisation/shutdown control
–0.5V to 40V
–0.5V to 80V
–0.3V to regulated voltage
–1V to +30V
4
15V relative to input return
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
1500
1
TYP
MAX Units
VDC
Isolation Voltage
Resistance
Flash tested for 1 second
Viso=500VDC
4000
GΩ
1 1 If optional pins ADJ and SS are required (as indicated in the pin connections diagram) prefix the ending “i” with
an E when ordering, e.g. NPH25S4803Ei.
2 A minimum load of 10% of rating is recommended for typical applications.
3 Optional where fitted.
4 Absolute maximum value for 30 seconds. Prolonged operation may damage the product.
www.cdpoweronline.com
All specifications typical at T =25°C, nominal input voltage and rated output current unless otherwise specified.
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