gs1t70-d540/1 isdn dc-dc converter january 1996 1/4 type v i v o i o gs1t70-d540/1 25 to 115 v 5 v 90 ma 40 v 10,5 ma features wide operating line termination voltage peak input overvoltage withstand: 1kv for 1.2/50 m s peak overvoltage withstand on output 2 (40v): 250v for 10/700 m 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 m a for 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 (2o x 2o x 0.71o) description the gs1t70-d540/1 converter has been designed for the auo 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 m s) and 250v (10/700 m s) respectively. when the input voltage is below 18v, the converter offers a very high input impedance and a maximum quiescent current of 10 m a. 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.
electrical characteristics (t amb =25 c unless otherwise specified) std. conditions: line termination voltage: 47 to 71v line resistance (rs): 10 to 560 w 87 to 99v 550 to 1400 w symbol parameter test conditions min typ max unit v i input voltage std. conditions 25 115 v v ipk input transient overvoltage t = 1.2/50 m s (pulse) 1kv v ist start up input 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 b w = 0 to 20mhz 5 20 mvpp v or2 output ripple voltage 2 std. conditions b w = 0 to 20mhz 10 30 mvpp en input noise voltage std. conditions b w = 0 to 20mhz 10 30 mvpp i o1 output current 1 std. conditions i o2 = 0 to 10.5 ma v o1 =5v 290ma i o1i output current 1 limit initiation std. conditions v o1 = 4.75 to 5.25v 110 130 ma i o2 output current 2 std. conditions i o1 = 2 to 90 ma v o2 = 40v 0 10.5 ma i osc2 output 2 short circuit current std. conditions output shorted (indefinite time) 914ma v is isolation voltage (pulse) input to output 1 input to output 2 output 1 to output 2 2000 v rms t op operating ambient temperature range 0 +80 c t stg storage temperature range 40 +85 c 2/4 lt (line termination voltage) = 47v to 71v rs (line resistance) = 10 to 560 w lt (line termination voltage) = 87v to 99v rs (line resistance) = 550 to 1400 w max input power (mw) nt status min output power 1 (5v)[mw] min output power 2 (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 deactivated emergency 25 45 180 deactivated emergency 25 45 950 activated with 40 v short circuit 330 short circuit 950 activated with 40v short circuit 330 short circuit output power characteristics gs1t70-d540/1
3/4 50.8 (2.00) 21.59 (0.85) 19.05 (0.75) 18.0 (0.71) 50.8 (2.00) 1 2 3 4 5 6 5.08 (0.2) 5.08 (0.2) 10.16 (0.4) 10.16 (0.4) 7.62 (0.3) 1.27 (0.05) bottom view 3.0 (1.18) o 1 (0.04) package v. dimensions in mm (inches). connection diagram and mechanical data figure 1. pin description pin description 1 input (either polarity). 2 input (either polarity). 3 +5v output. 4 return for +5v output. 5 +40v output. 6 return for +40v output. gs1t70-d540/1
4/4 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 10 m a. 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. ? 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. gs1t70-d540/1
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