GS25/30T48 Family
25/30 W DC-DC CONVERTER FAMILY
December 1993
1/5
Type
V
in
V
out
I
out
GS25T48-5
36 to 72 V
5 V
5 A
GS25T48-12
36 to 72 V
12 V
2,5 A
GS25T48-15
36 to 72 V
15 V
2 A
FEATURES
MTBF in excess of 1M hours at +45
°
C ambient
temperature
Wide input voltage range (36 to 72V)
No external component required
High efficiency (see data)
Non latching permanent short-circuit protection
Overvoltage protection
Redundant operation
Remote output voltage sense
Remote INHIBIT/ENABLE
Soft-start
Minimized reflected input current
Reverse input polarity protection
Peak input overvoltage withstand
No derating over the temperature range
500V
DC
minimum isolation between input and
output
PCB or chassis mountable
DESCRIPTION
The GS25T48-5, GS30T48-12 and GS30T48-15
are isolated DC-DC converters designed for gen-
eral purpose application.
The output power is in the range of 25W to 30W.
To ensure very long life, these converters do not
use electrolytic aluminum capacitors or optoelec-
tronic feedback systems.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Vi
DC Input Voltage
34 to 72V
V
Vipk
Input Transient Overvoltage (t
1sec.)
90
V
Vir
Input Reverse Voltage
100
V
Tstg
Storage Temperature Range
-55 to +105
°
C
Top
Operating Temperature Range
-25 to +71
°
C
2/5
ELECTRICAL CHARACTERISTICS (T
amb
= 25
°
C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Vi
Input Voltage
Full Load
36
48
72
V
Ii
Input Current
GS25T48-5
Full Load
640
mA
GS30T48-12
Full Load
730
GS30T48-15
Full Load
730
Iir
Input Reflected
Current
Vi = 48V
Full Load
50
mApp
Iisc
Input Short-circuit
Current
GS25T48-5
Vi = 48V
710
mA
GS30T48-12
Vi = 48V
820
GS30T48-15
Vi = 48V
820
liq
Input Quiescent
Current
Vi = 48V
Converter OFF
5
mA
Vinhl
Low Inhibit Voltage
Vi = 48V
Full Load
1.2
V
Vinhh
High Inhibit Voltage
Vi = 48V
Full Load
1.8
(open)
V
linh
Input Inhibit Current
Vi = 48V
Full Load
1
mA
Vo
Output Voltage
GS25T48-5
Vi = 48V
Full Load
4.95
5.00
5.05
V
GS30T48-12
Vi = 48V
Full Load
11.88
12.00
12.12
GS30T48-15
Vi = 48V
Full Load
14.85
15.00
15.15
Vor
Output Ripple and
Noise Voltage
Vi = 48V
Full Load
10
mVpp
Vo
Line Regulation
Vi = 36 to 72V
Full Load
±
0.001
%
Vo
Load Regulation
Vi = 48V
Full Load to No Load
±
0.05
%
Voov
Output Overvoltage
Protection
GS25T48-5
Vi = 48V
Full Load
6.8
V
GS30T48-12
Vi = 48V
Full Load
15
GS30T48-15
Vi = 48V
Full Load
18
Vo
Remote Sense per Leg
Vi = 36V
0.5
V
Tc
Temperature
Coefficient
Vi = 48V Full Load
Operating Temperature Range
+0.02
%/
°
C
GS25/30T48 FAMILY
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Io
Output Current
GS25T48-5
Vi = 36 to 72V
0
5
A
GS30T48-12
Vi = 36 to 72V
0
2.5
GS30T48-15
Vi = 36 to 72V
0
2
Iosck
Output Current Limit
GS25T48-5
Vi = 48V
Overload
5.5
A
GS30T48-12
Vi = 48V
Overload
2.75
GS30T48-15
Vi = 48V
Overload
2.2
tss
Soft-start Time
Vi = 48V
Full Load
30
ms
trt
Transient Recovery
Time
Vi = 48V
Step Load Change
Io = 25%
75
µ
s
Vis
Isolation Voltage
500
Vdc
Ris
Isolation Resistance
10
9
fs
Switching Frequency
150
kHz
Efficiency
GS25T48-5
Vi = 48V
Full Load
81
%
GS30T48-12
Vi = 48V
Full Load
86
GS30T48-15
Vi = 48V
Full Load
86
Rthc
Thermal Resistance
Case to Ambient
4
°
C/W
ELECTRICAL CHARACTERISTICS (T
amb
= 25
°
C unless otherwise specified) (cont'd)
3/5
GS25/30T48 FAMILY
Package F. Dimensions in mm. (inches)
CONNECTION DIAGRAM AND MECHANICAL DATA
4/5
PIN DESCRIPTION
Pin
Function
Description
1
- IN
Negative input voltage.
2
+ IN
Positive input voltage. Unregulated input voltage (typically 48V) must be applied between
pins 1-2. The input section of the DC-DC converter is protected against reverse polarity by
a series diode. No external fuse is required. Input is filtered by a Pi network.
3
ON/OFF
Logically compatible with CMOS or open collector TTL. The converter is ON (Enable)
when the voltage applied to this pin with reference to pin 1 is higher than 1.8V. The
converter is OFF (Inhibit) for a control voltage lower than 1.2V. When the pin is
unconnected the converter is ON (Enable).
4
+ SENSE
Senses the remote load high side. To be connected to pin 6 when remote sense is not
used.
5
- SENSE
Senses the remote load return. To be connected to pin 7 when remote sense is not used.
6
+ OUT
Output voltage.
7
- OUT
Output voltage return.
GS25/30T48 FAMILY
5/5
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelectronics All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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GS25/30T48 FAMILY
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