NPH25S Datasheet, PDF (1/2 Pages) C&D Technologies – Isolated 25W Single Output DC/DC Converters

NPH25S SERIES
Isolated 25W Single Output DC-DC Converters
FEATURES
■ High Efficiency to 89%
■ Power Density up to 1.78W/cm³
(28W/in³ )
■ 1.5kV Input to Output Isolation
■ Industry Standard Pinout
■ UL 1950 Recognised
■ Non Latching Current Limit
■ Constant 350kHz Frequency
■ Versatile Control Options
■ Continuous Rating to 30W at 60°C
Without Heatsink
■ Operation to Zero Load
■ Protected Against All Load Faults
■ Internal Over Temperature Protection
■ Uses No Electrolytic Capacitors
■ UL 94V-0 Package Materials
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
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.
SELECTION GUIDE
Order Code¹
Nominal
Input Voltage
(V)
NPH25S2403i
24
NPH25S2405i
24
NPH25S2412i
24
NPH25S2415i
24
NPH25S4803i
48
NPH25S4805i
48
NPH25S4812i
48
NPH25S4815i
48
Output
Voltage
(V)
3.4
5.1
12.1
15.1
3.4
5.1
12.1
15.1
INPUT CHARACTERISTICS
Parameter
Voltage Range
Conditions
Continuous operation, 24V input types
Continuous operation, 48V input types
Output
Current
(A)
7.3
5.0
2.1
1.7
7.3
5.0
2.1
1.7
Efficiency
(%)
81
84
86
87
83
85
88
89
MIN
18
36
NOM
24
48
MAX
36
75
Units
V
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN TYP MAX Units
Voltage Set
Point Error
50% load
0.5
%
Overall
Voltage Error
Case temperature –40°C to 110°C
Load 0% - 100%
Input specified range
2.5
%
Temperature Coefficient
of Output Voltage
(slope)
250 ppm°C
Deviation of
Output Voltage
Temperature MIN-MAX
0.5
1
%
Line Regulation
Operating voltage range, 50% load
0.1
%
Load Regulation
0% - 100% rated load²
0.5
%
Ripple
rms
70
mV
CONTROL CHARACTERISTICS
Parameter
Conditions
MIN TYP MAX Units
Voltage Trimming
Range
At rated load,
Trim control at either output
±10
%
Remote Switch Input³ Not operating
(voltage relative
to input negative)
Operating, open circuit voltage
-15
0
1.5
V
9
10
11
Start Delay
Time from application of valid input
voltage to output being in specification
25
50 mS
Synchronisation³
Specified drive signal
320
440 kHz
Switching Frequency
330 350 395 kHz
ABSOLUTE MAXIMUM RATINGS
Input voltage, 24V input types
Input voltage, 48V input types
Output Voltage
Output trim control
Synchronisation/shutdown control
–0.5V to 40V⁴
–0.5V to 80V⁴
–0.3V to regulated voltage
–1V to +30V
±15V relative to input return
ISOLATION CHARACTERISTICS
Parameter
Isolation Voltage
Resistance
Conditions
Flash tested for 1 second
Viso=500VDC
MIN
1500
1
TYP
4000
MAX
Units
VDC
GΩ
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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.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.