GS1T70-D540F
ISDN DC-DC CONVERTER (FRENCH VERSION)
Type V
GS1T70-D540F 25 to 115 V
i
V
o
5 V 90 mA
40 V 10,5 mA
I
o
FEATURES
Wide operating line termination battery voltage
Peak input overvoltage withstand: 1kV for
1.2/50µs
Peak overvoltage withstand on Output 2 (40V):
250Vfor 10/700µs
Positiveor negative input voltage polarity
Input and output filtering
Short-circuitprotectionon bothoutputs
Input power during shortcircuit within specification
Minimumcurrentdrain duringstand-bycondition:
10µAfor Vi<18V
Undervoltagelock out at 10V
Input-outputisolation voltage:10 kV pulse 1,2/50
µseconds
Output1-output2isolation voltage: 2000V
RMS
for
60 seconds
Mechanicaldimensions(Lx W x H):56 mm x 56
mm x 18 mm (2.2”x 2.2” x 0.71”)
DESCRIPTION
The GS1T70-D540Fconverterhas been designed
for the “U” interface of an ISDN-NTBA (Network
TerminationBasicAccess)systemwitheither4B3T
or 2B1Q standard trasmission.
It meets the requirements of the following specifications:
EN 60950
CCITT I.430
CCITT G.960
CCITT G.961
ETS 300 002
ETS 300 012
ETS 300 047 (ISDN BASIC ACCESS, Safetyand
Protection)
Two isolated outputs, 5V/90mA and 40V/10.5mA
are supplied.Theconverteroffersshort-circuitprotection (short-circuit on 40V output doesn’t affect
5V output and the input power never exceedsthe
limitof the specification),input either voltagepolarity,80%minimumefficiency atmaximumload,input
and output filtering to meet very stringent noise
requirements.
The input and the output 2 (40V) stagesare protected against differential overvoltage up to 1kV
(1.2/50µs) and 250V(10/700µs) respectively.
Whenthe inputvoltageis below 18V,the converter
offersa veryhigh input impedanceandamaximum
quiescentcurrent of 10µA.
These features allow the converter to operate directly connected to the telephoneline without any
externalcomponents.
In addition, the wide operatinginput voltagerange
allows it to operate within the whole range of LT
(Line Termination) battery voltageand its relevant
lineresistance.
2000V
isolation voltage for 60 second is pro-
RMS
videdbetweeninputto outputsandbetween output
1 and output 2.
June 1994 1/4
GS1T70-D540F
ELECTRICALCHARACTERISTICS (T
=25°C unless otherwisespecified)
amb
Std. Conditions:
Line Termination voltage: 90 to 110V Line Resistance (Rs): 50 to 1400Ω
105 to115V 500 to 1900 Ω
Symbol
Input Voltage Std. Conditions
V
i
V
V
V
V
V
V
V
eN
I
I
o1I
I
I
osc2
V
T
T
Input Transient
ipk
Overvoltage
Start Up Input
ist
Voltage
Input Undervoltage
iuv
Lockout
Output Voltage 1 Std. Conditions
o1
Output Voltage 2 Std. Conditions
o2
Output Ripple
or1
Voltage1
Output Ripple
or2
Voltage2
Input Noise Voltage Std. Conditions
Output Current 1 Std. Conditions
o1
Output Current 1
Limit Initiation
Output Current 2 Std. Conditions
o2
Output 2 Short
Circuit Current
IsolationVoltage
is
(pulse)
Operating Ambient
op
TemperatureRange
Storage
stg
TemperatureRange
Parameter Test Conditions Min Typ Max Unit
25 115 V
t = 1.2/250µs (pulse)
See fig. 2
Std. Conditions
BW = 0 to 20MHz
Std. Conditions
BW = 0 to 20MHz
BW = 0 to 20MHz
Io2= 0 to 10.5mA Vo1=5V
Std. Conditions
Vo1= 4.75 to 5.25V
Io1= 2 to 90mA Vo2= 40V
Std. Conditions
Output Shorted (Indefinite time)
Input to Output 1 t = 1.2/50 µs
Input to Output 2 t = 1.2/50 µs
Output 1 to Output 2 t = 1.2/50 µs
28 44 V
10 V
4.75 5 5.25 V
34 40 42 V
5 20 mVpp
10 30 mVpp
10 30 mVpp
290mA
110 130 mA
0 10.5 mA
914mA
10000
10000
4000
0 +75 °C
– 40 +85 °C
1kV
V
RMS
OUTPUT POWERCHARACTERISTICS
LT (Line Termination Voltage) = 90V to 110V
Rs (Line Resistance) = 50 to 1400 Ω
Max
Input
Power
(mW)
600 Activated 420 0 600 Activated 420 0
1150 Activated Emergency 450 420 1150 ActivatedEmergency 450 420
200 Deactivated 110 0 200 Deactivated 110 0
270 Deactivated Emergency 110 60 270 Deactivated Emergency 110 60
1150
2/4
NT Status
Activated with 40 V
Shortcircuit
Min
Output
Power 1
(5V)[mW]
450
Min
Output
Power 2
(40V)[mW]
Short
circuit
LT (Line Termination Voltage)= 105V to 115V
Rs (Line Resistance) = 500 to 1900 Ω
Max
Input
Power
(mW)
1150
NT Status
Activated with 40V
Short circuit
Output
Power 1
(5V)[mW]
Min
450
Min
Output
Power 2
(40V)[mW]
Short
circuit
CONNECTION DIAGRAM AND MECHANICAL DATA
Figure1.
GS1T70-D540F
Package V.Dimensions in mm (inches).
PIN DESCRIPTION
Pin Description
1
2
3
4
5
6
Input(either polarity).
Input(either polarity).
+5V Output.
Return for +5V Output.
+40V Output.
Return for +40V Output.
3/4
GS1T70-D540F
VOLTAGE SUPPLY OPERATING AREA
Figure2 showsthe VoltageSupply Operating area
duringthe switchON-OFFand OFF-ONsequence.
- Switch ON-OFF sequence:
For an Input VoltageVi > 25V,the circuitoperates
correctly, because it lies in the Voltage Supply
OperatingArea.
Theconvertergoes inHigh Input Impedancemode
<10µA) when the Viis lower than 10V. If V
(I
q
remainsbetween0-10Vrangeforalmostforalmost
100 ms, the converter is in OFF condition.
Figure 2.
Vi
115V
Voltage
Supply
Operating
Area
25V
- Switch OFF-ON sequence:
The quiescentcurrent Iq remainsbelow 10µAif 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
SupplyOperatingArea (V
i
VoltageSupply
44V
34V
Operating Area
= 25 to 115V).
in
10V
Iq < 10 µA Area
0V
18V
Iq < 10 µAArea
t
t>1mS
t>100mS
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 useas criticalcomponents 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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SGS-THOMSON Microelectronics GROUP OF COMPANIES
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