NPH25S SERIES
Isolated 25W Single Output DC-DC Converters
SELECTION GUIDE
FEATURES
High Efficiency to 89%
Power Density up to 1.78W/cm
3
(28W/in
3
)
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 60C
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.
Nominal
Output
Output
Input Voltage
Voltage
Current
Efficiency
Order Code
1
(V)
(V)
(A)
(%)
NPH25S2403i
24
3.4
7.3
81
NPH25S2405i
24
5.1
5.0
84
NPH25S2412i
24
12.1
2.1
86
NPH25S2415i
24
15.1
1.7
87
NPH25S4803i
48
3.4
7.3
83
NPH25S4805i
48
5.1
5.0
85
NPH25S4812i
48
12.1
2.1
88
NPH25S4815i
48
15.1
1.7
89
Parameter
Conditions
MIN
NOM
MAX
Units
Voltage Range
Continuous operation, 24V input types
18
24
36
V
Continuous operation, 48V input types
36
48
75
Parameter
Conditions
MIN
TYP
MAX
Units
Voltage Set
50% load
0.5
%
Point Error
Overall
Case temperature 40C to 110C
Voltage Error
Load 0% - 100%
2.5
%
Input specified range
Temperature Coefficient
of Output Voltage
250
ppmC
(slope)
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
2
0.5
%
Ripple
rms
70
mV
Input voltage, 24V input types
0.5V to 40V
4
Input voltage, 48V input types
0.5V to 80V
4
Output Voltage
0.3V to regulated voltage
Output trim control
1V to +30V
Synchronisation/shutdown control
15V relative to input return
INPUT CHARACTERISTICS
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Voltage Trimming
At rated load,
10
%
Range
Trim control at either output
Remote Switch Input
3
Not operating
-15
0
1.5
V
(voltage relative
to input negative)
Operating, open circuit voltage
9
10
11
Start Delay
Time from application of valid input
voltage to output being in specification
25
50
mS
Synchronisation
3
Specified drive signal
320
440
kHz
Switching Frequency
330
350
395
kHz
CONTROL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Voltage
Flash tested for 1 second
1500
VDC
Resistance
Viso=500VDC
1
4000
G
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=25C, nominal input voltage and rated output current unless otherwise specified.
www.cdpoweronline.com
NPH25S SERIES
Isolated 25W Single Output DC-DC Converters
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
For information and instructions on use, please consult the NPH SERIES
APPLICATION NOTES.
C&D Technologies (NCL) Limited 2002
NDC NPH25S.5
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
Instructions for use are available from www.cdpoweronline.com
ENVIRONMENTAL
Parameter
Conditions
MIN
TYP
MAX
Units
Case Temperature
Full load
40
110
C
Storage
Absolute MAX internal temperature
40
125
C
Relative Humidity
Non condensing 85C
85
%
Thermal Protection
Operates at case temperature
110
C
Weight: 45g
All dimensions in Inches (mm) 0.01 (0.25)
All pins on a 0.10 (2.54) pitch and within 0.01 (0.25) of true position
* Optional
THERMAL CHARACTERISTICS
THERMAL PERFORMANCE
UL 1950 recognition -
MAX permissible loads for a given ambient temperature for any NPH25S model
Temperature (C)
Power (W)
Temperature (C)
Power (W)
40
25.0
80
13.9
50
22.2
85
12.5
60
19.4
90
11.1
70
16.6
MAX power rating with case temperature maintained by external means
(eg forced air cooling)
Case Temperature
Part Number
100C
105C
110C
Units
NPH25S2403
24
20
15
NPH25S2405
25
22
18
W
NPH25S2412
30
24
21
NPH25S2415
30
27
22
NPH25S4803
25
20
16
NPH25S4805
25
24
20
W
NPH25S4812
30
29
24
NPH25S4815
30
30
26
MECHANICAL DIMENSIONS
35
30
25
20
15
10
5
0
-40
-20
0
20
40
60
80
100 120
Ambient Temperature (C)
2415
2412
2405
2403
Output Power (W)
35
30
25
20
15
10
5
0
-40
-20
0
20
40
60
80
100 120
Ambient Temperature (C)
Output Power (W)
4815
4812
4805
4803
1.97 (50.00)
0.80
(20.32)
1.38
(35.00)
0.80
(20.32)
0.29
(7.34)
0.39 (10.00)
0.04 (1.04)
0.04 (0.90)
0.18 (4.50)
0.15 (3.70)
0.20
(5.08)
SS
+V
IN
-V
IN
+V
OUT
ADJ
0V
0.59
(14.96)
0.58
(14.84)
0.20 (5.08)
0.20 (5.08)
BOTTOM VIEW
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax: +44 (0)1908 617545
email: info@cdtechno-ncl.com
www.cdpoweronline.com
C&D Technologies Inc.
3400 E Britannia Drive, Tucson,
Arizona 85706, USA
Tel: +1 (800) 547-2537
Fax: +1 (520) 741-4598
email: sales@cdtechno.com
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