SGS Thomson Microelectronics GS1T70-D540-1 Datasheet
GS1T70-D540/1
ISDN DC-DC CONVERTER
January 1996 1/4
Type V
i
V
o
I
o
GS1T70-D540/1 25 to 115V
5 V 90 mA
40 V 10,5 mA
FEATURES
Wide operating line terminationvoltage
Peak input ove rvoltage withstand: 1kV for
1.2/50µs
Peak overvoltage withstand on Output 2 (40V):
250V for 10/700µs
Positiveor negative input voltage polarity
Input andoutput filtering
Short-circuitprotection on both outputs
Input power during shortcircuit within specification
Minimum currentdrain duringstand-by condition:
10µAfor Vi<18V
Input-output isolation voltage: 2000V
RMS
for 60
seconds
Output1-output2 isolation voltage: 2000V
RMS
for
60 seconds
Mechanical dimensions (L x W x H): 50.8 mm x
50.8 mm x 18 mm (2” x 2” x 0.71”)
DESCRIPTION
TheGS1T70-D540/1converter hasbeen designed
for the “U” interface of an ISDN-NTBA (Network
Termination BasicAccess)systemwith either4B3T
or 2B1Q standard trasmission.
It meets the requirements of the following specifications:
EN 60950
CCITTI.430
CCITTG.960
CCITTG.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
aresupplied. The converter offers short-circuitprotection (short-circuit on 40V output doesn’t affect
5Voutputandthe input power never exceeds the
limitofthe specification), input eithervoltagepolarity,80%minimum efficiencyatmaximumload,input
and output filtering to meet very stringent noise
requirements.
The input and the output 2 (40V) stages are protected against differential overvoltage up to 1kV
(1.2/50µs)and 250V (10/700µs) respectively.
When the input voltageis below 18V,the converter
offersa veryhigh input impedanceand amaximum
quiescent current of 10µA.
These features allow the converter to operate directly connected to the telephone line without any
external components.
In addition, the wide operatinginputvoltage 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 providedbetween inputto outputsandbetween output
1 and output 2.
ELECTRICAL CHARACTERISTICS (T
amb
=25°Cunless otherwisespecified)
Std. Conditions:
LineTermination voltage:47 to 71V Line Resistance (Rs): 10 to 560 Ω
87 to 99V 550 to 1400 Ω
Symbol
Parameter TestConditions Min Typ Max Unit
V
i
Input Voltage Std. Conditions
25 115 V
V
ipk
Input Transient
Overvoltage
t = 1.2/50µs (pulse)
1kV
V
ist
Start UpInput
Voltage
See fig.2
28 44 V
V
o1
Output Voltage 1 Std. Conditions
4.75 5 5.25 V
V
o2
Output Voltage 2 Std. Conditions
34 40 42 V
V
or1
Output Ripple
Voltage 1
Std. Conditions
BW= 0 to 20MHz
5 20 mVpp
V
or2
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
I
o1
Output Current 1 Std. Conditions
Io2= 0 to 10.5 mAVo1=5V
290mA
I
o1I
Output Current 1
Limit Initiation
Std. Conditions
Vo1= 4.75 to 5.25V
110 130 mA
I
o2
Output Current 2 Std. Conditions
Io1= 2 to 90 mA Vo2= 40V
0 10.5 mA
I
osc2
Output 2 Short
CircuitCurrent
Std. Conditions
Output Shorted (Indefinite time)
914mA
V
is
Isolation Voltage
(pulse)
Input to Output1
Input to Output2
Output 1 to Output2
2000 V
RMS
T
op
OperatingAmbient
TemperatureRange
0 +80 °C
T
stg
Storage
TemperatureRange
– 40 +85 °C
2/4
LT (Line Termination Voltage)= 47V to 71V
Rs (Line Resistance) = 10 to 560 Ω
LT(Line TerminationVoltage) = 87V to 99V
Rs (LineResistance)= 550 to 1400 Ω
Max
Input
Power
(mW)
NT Status
Min
Output
Power1
(5V)[mW]
Min
Output
Power2
(40V)[mW]
Max
Input
Power
(mW)
NT Status
Min
Output
Power 1
(5V)[mW]
Min
Output
Power 2
(40V)[mW]
450 Activated 320 0 450 Activated 320 0
950 Activated Emergency 330 410 950 Activated Emergency 330 410
90 Deactivated 25 0 90 Deactived 25 0
180 DeactivatedEmergency 25 45 180 DeactivatedEmergency 25 45
950
Activated with 40 V
Short circuit
330
Short
circuit
950
Activated with 40V
Short circuit
330
Short
circuit
OUTPUT POWERCHARACTERISTICS
GS1T70-D540/1
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