GS1T70-D540F
ISDN DC-DC CONVERTER (FRENCH VERSION)
June 1994
1/4
Type
V
i
V
o
I
o
GS1T70-D540F
25 to 115 V
5 V
90 mA
40 V
10,5 mA
FEATURES
Wide operating line termination battery voltage
Peak input overvoltage with stand: 1kV for
1.2/50
s
Peak overvoltage withstand on Output 2 (40V):
250V for 10/700
s
Positive or negative input voltage polarity
Input and output filtering
Short-circuit protection on both outputs
Input power during shortcircuit within specifica-
tion
Minimum current drain during stand-by condition:
10
A for Vi<18V
Undervoltage lock out at 10V
Input-output isolation voltage: 10 kV pulse 1,2/50
seconds
Output1-output2isolation voltage: 2000V
RMS
for
60 seconds
Mechanical dimensions (L x W x H): 56 mm x 56
mm x 18 mm (2.2" x 2.2" x 0.71")
DESCRIPTION
The GS1T70-D540F converter has been designed
for the "U" interface of an ISDN-NTBA (Network
Termination Basic Access) system with either 4B3T
or 2B1Q standard trasmission.
It meets the requirements of the following specifi-
cations:
EN 60950
CCITT I.430
CCITT G.960
CCITT G.961
ETS 300 002
ETS 300 012
ETS 300 047 (ISDN BASIC ACCESS, Safety and
Protection)
Two isolated outputs, 5V/90mA and 40V/10.5mA
are supplied. The converter offers short-circuit pro-
tection (short-circuit on 40V output doesn't affect
5V output and the input power never exceeds the
limit of the specification), input either voltage polar-
ity, 80% minimum efficiency at maximum load, input
and output filtering to meet very stringent noise
requirements.
The input and the output 2 (40V) stages are pro-
tected against differential overvoltage up to 1kV
(1.2/50
s) and 250V (10/700
s) respectively.
When the input voltage is below 18V, the converter
offers a very high input impedance and a maximum
quiescent current of 10
A.
These features allow the converter to operate di-
rectly connected to the telephone line without any
external components.
In addition, the wide operating input voltage range
allows it to operate within the whole range of LT
(Line Termination) battery voltage and its relevant
line resistance.
2000V
RMS
isolation voltage for 60 second is pro-
vided between input to outputs and between output
1 and output 2.
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C unless otherwise specified)
Std. Conditions:
Line Termination voltage: 90 to 110V
Line Resistance (Rs):
50 to 1400
105 to 115V
500 to 1900
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Vi
Input Voltage
Std. Conditions
25
115
V
Vipk
Input Transient
Overvoltage
t = 1.2/250
s (pulse)
1
kV
Vist
Start Up Input
Voltage
See fig. 2
28
44
V
Viuv
Input Undervoltage
Lockout
10
V
Vo1
Output Voltage 1
Std. Conditions
4.75
5
5.25
V
Vo2
Output Voltage 2
Std. Conditions
34
40
42
V
Vor1
Output Ripple
Voltage 1
Std. Conditions
BW = 0 to 20MHz
5
20
mVpp
Vor2
Output Ripple
Voltage 2
Std. Conditions
BW = 0 to 20MHz
10
30
mVpp
eN
Input Noise Voltage
Std. Conditions
BW = 0 to 20MHz
10
30
mVpp
Io1
Output Current 1
Std. Conditions
Io2 = 0 to 10.5 mA Vo1 = 5V
2
90
mA
Io1I
Output Current 1
Limit Initiation
Std. Conditions
Vo1 = 4.75 to 5.25V
110
130
mA
Io2
Output Current 2
Std. Conditions
Io1 = 2 to 90 mA Vo2 = 40V
0
10.5
mA
Iosc2
Output 2 Short
Circuit Current
Std. Conditions
Output Shorted (Indefinite time)
9
14
mA
Vis
Isolation Voltage
(pulse)
Input to Output 1 t = 1.2/50
s
Input to Output 2 t = 1.2/50
s
Output 1 to Output 2 t = 1.2/50
s
10000
10000
4000
VRMS
Top
Operating Ambient
Temperature Range
0
+75
C
Tstg
Storage
Temperature Range
40
+85
C
2/4
LT (Line Termination Voltage) = 90V to 110V
Rs (Line Resistance) = 50 to 1400
LT (Line Termination Voltage) = 105V to 115V
Rs (Line Resistance) = 500 to 1900
Max
Input
Power
(mW)
NT Status
Min
Output
Power 1
(5V)[mW]
Min
Output
Power 2
(40V)[mW]
Max
Input
Power
(mW)
NT Status
Min
Output
Power 1
(5V)[mW]
Min
Output
Power 2
(40V)[mW]
600
Activated
420
0
600
Activated
420
0
1150
Activated Emergency
450
420
1150
Activated Emergency
450
420
200
Deactivated
110
0
200
Deactivated
110
0
270
Deactivated Emergency
110
60
270
Deactivated Emergency
110
60
1150
Activated with 40 V
Short circuit
450
Short
circuit
1150
Activated with 40V
Short circuit
450
Short
circuit
OUTPUT POWER CHARACTERISTICS
GS1T70-D540F
3/4
Package V. Dimensions in mm (inches).
CONNECTION DIAGRAM AND MECHANICAL DATA
Figure 1.
PIN DESCRIPTION
Pin
Description
1
Input (either polarity).
2
Input (either polarity).
3
+5V Output.
4
Return for +5V Output.
5
+40V Output.
6
Return for +40V Output.
GS1T70-D540F
4/4
VOLTAGE SUPPLY OPERATING AREA
Figure 2 shows the Voltage Supply Operating area
during the switch ON-OFF and OFF-ON sequence.
- Switch ON-OFF sequence:
For an Input Voltage Vi > 25V, the circuit operates
correctly, because it lies in the Voltage Supply
Operating Area.
The converter goes in High Input Impedance mode
(I
q
< 10
A) when the V
i
is lower than 10V. If V
i
remains between 0 -10V range for almost for almost
100 ms, the converter is in OFF condition.
- Switch OFF-ON sequence:
The quiescent current Iq remains below 10
A if Vi
is lower than 18V.
The start-up voltage is between 34 to 44V. After 1
ms in this condition, the converter is in Voltage
Supply Operating Area (V
in
= 25 to 115V).
115V
25V
0V
10V
44V
t>1mS
t>100mS
18V
Voltage Supply
Operating Area
Voltage
Supply
Operating
Area
Iq < 10
A Area
Iq < 10
A Area
Vi
t
34V
Figure 2.
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
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GS1T70-D540F
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