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GS1T70-D540/1
ISDN DC-DC CONVERTER
Type GS1T70-D540/1 Vi 25 to 115 V Vo 5V 40 V Io 90 mA 10,5 mA
FEATURES Wide operating line termination voltage Peak input overvoltage withstand: 1kV for 1.2/50s Peak overvoltage withstand on Output 2 (40V): 250V for 10/700s Positive or negative input voltage polarity Input and output filtering Short-circuit protection on both outputs Input power during shortcircuit within specification Minimum current drain during stand-by condition: 10A for Vi<18V Input-output isolation voltage: 2000V RMS for 60 seconds Output1-output2 isolation voltage: 2000VRMS 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 The GS1T70-D540/1 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 specifications: 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 protection (short-circuit on 40V output doesn't affect 5V output and the input power never exceeds the limit of the specification), input either voltage polarity, 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 protected against differential overvoltage up to 1kV (1.2/50s) and 250V (10/700s) respectively. When the input voltage is below 18V, the converter offers a very high input impedance and a maximum quiescent current of 10A. These features allow the converter to operate directly 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. 2000VRMS isolation voltage for 60 second is provided between input to outputs and between output 1 and output 2.
January 1996
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GS1T70-D540/1
ELECTRICAL CHARACTERISTICS (Tamb = 25C unless otherwise specified) Std. Conditions: Line Termination voltage: 47 to 71V 87 to 99V
Symbol Vi Vipk Vist Vo1 Vo2 Vor1 Vor2 eN Io1 Io1I Io2 Iosc2 Vis Parameter Input Voltage Input Transient Overvoltage Start Up Input Voltage Output Voltage 1 Output Voltage 2 Output Ripple Voltage 1 Output Ripple Voltage 2 Input Noise Voltage Output Current 1 Output Current 1 Limit Initiation Output Current 2 Output 2 Short Circuit Current Isolation Voltage (pulse) Operating Ambient Temperature Range Storage Temperature Range
Line Resistance (Rs): 10 to 560 550 to 1400
Test Conditions Std. Conditions t = 1.2/50s (pulse) See fig. 2 Std. Conditions Std. Conditions Std. Conditions B W = 0 to 20MHz Std. Conditions B W = 0 to 20MHz Std. Conditions B W = 0 to 20MHz Std. Conditions Io2 = 0 to 10.5 mA Vo1 = 5V Std. Conditions Vo1 = 4.75 to 5.25V Std. Conditions Io1 = 2 to 90 mA Vo2 = 40V Std. Conditions Output Shorted (Indefinite time) Input to Output 1 Input to Output 2 Output 1 to Output 2 2 110 0 9 2000 28 4.75 34 5 40 5 10 10 Min 25 Typ Max 115 1 44 5.25 42 20 30 30 90 130 10.5 14 Unit V kV V V V mVpp mVpp mVpp mA mA mA mA VRMS C C
Top Tstg
0 - 40
+80 +85
OUTPUT POWER CHARACTERISTICS
LT (Line Termination Voltage) = 47V to 71V Rs (Line Resistance) = 10 to 560 Max Input Power (mW) 450 950 90 180 950 Min Min Output Output Power 1 Power 2 (5V)[mW] (40V)[mW] 320 330 25 25 330 0 410 0 45 Short circuit LT (Line Termination Voltage) = 87V to 99V Rs (Line Resistance) = 550 to 1400 Max Input Power (mW) 450 950 90 180 950 Min Min Output Output Power 1 Power 2 (5V)[mW] (40V)[mW] 320 330 25 25 330 0 410 0 45 Short circuit
NT Status
NT Status
Activated Activated Emergency Deactivated Deactivated Emergency Activated with 40 V Short circuit
Activated Activated Emergency Deactived Deactivated Emergency Activated with 40V Short circuit
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GS1T70-D540/1
CONNECTION DIAGRAM AND MECHANICAL DATA Figure 1.
50.8 (2.00)
18.0 (0.71)
O 1 (0.04)
Bottom view
1.27 (0.05) 50.8 (2.00)
3 4
5.08 (0.2) 10.16 (0.4)
5 6
5.08 (0.2) 10.16 (0.4)
2 1
7.62 (0.3)
21.59 (0.85)
19.05 (0.75) 3.0 (1.18)
Package V. Dimensions in mm (inches).
PIN DESCRIPTION
Pin 1 2 3 4 5 6 Input (either polarity). Input (either polarity). +5V Output. Return for +5V Output. +40V Output. Return for +40V Output. Description
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GS1T70-D540/1
VOLTAGE SUPPLY OPERATING AREA Figure 2 shows the Voltage Supply Operating area during a switching OFF-ON sequence. The start-up voltage is 44V maximum. When the input voltage is below 18V the maximum quiescent current is lower than 10A.
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. (c) 1996 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - Canada - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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