GS1T70-D540F View Datasheet(PDF) - STMicroelectronics

Part Name

Description

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GS1T70-D540F

ISDN DC-DC CONVERTER (FRENCH VERSION)

STMicroelectronics 

GS1T70-D540F

ISDN DC-DC CONVERTER (FRENCH VERSION)

Type

Vi

GS1T70-D540F 25 to 115 V

Vo

5V

40 V

Io

90 mA

10,5 mA

FEATURES

Wide operating line termination battery voltage

Peak input overvoltage withstand: 1kV for

1.2/50µs

Peak overvoltage withstand on Output 2 (40V):

250V for 10/700µs

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:

10µA 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

(1.2/50µs) 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 10µA.

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.

June 1994

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