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GS1T70-D540F Datasheet(PDF) 1 Page - STMicroelectronics |
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GS1T70-D540F Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 4 page  GS1T70-D540F ISDN DC-DC CONVERTER (FRENCH VERSION) June 1994 1/4 Type Vi Vo Io 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 µs Peak overvoltage withstand on Output 2 (40V): 250V for 10/700 µs 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 µA for Vi<18V Undervoltage lock out at 10V Input-output isolation voltage: 10 kV pulse 1,2/50 µseconds Output1-output2isolation voltage: 2000VRMS 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 µs) and 250V (10/700µs) respectively. When the input voltage is below 18V, the converter offers a very high input impedance and a maximum quiescent current of 10 µA. 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. 2000VRMS isolation voltage for 60 second is pro- vided between input to outputs and between output 1 and output 2. |
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