GS1T70-D540F
ISDN DC-DC CONVERTER (FRENCH VERSION)
Type
GS1T70-D540F
V
i
25 to 115 V
V
o
5V
40 V
I
o
90 mA
10,5 mA
FEATURES
Wide operating line termination battery voltage
Peak input overvoltage withstand: 1kV for
1.2/50碌s
Peak overvoltage withstand on Output 2 (40V):
250V for 10/700碌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碌A(chǔ) for Vi<18V
Undervoltage lock out at 10V
Input-output isolation voltage: 10 kV pulse 1,2/50
碌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鈥?x 2.2鈥?x 0.71鈥?
DESCRIPTION
The GS1T70-D540F converter has been designed
for the 鈥淯鈥?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鈥檛 affect
5V output and the input power never exceeds the
June 1994
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碌s) and 250V (10/700碌s) respectively.
When the input voltage is below 18V, the converter
offers a very high input impedance and a maximum
quiescent current of 10碌A(chǔ).
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.
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STMICROELECTRONICS
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