GS1T70-D540/2

ISDN DC-DC CONVERTER

20 January 1997

1/5

PRELIMINARY DATA

Type

GS1T70-D540/2

28 to 115 V

out 1 : 5V

72 mA

out 2 : 40V

12 mA

FEATURES

Wide operating line termination voltage

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

60 seconds

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-D540/2 converter has been designed

for the “U” interface of an ISDN-NTBA (Network

Termination Basic Access) system with either 4B3T

or 2B1Q standard trasmission.

Two outputs, 5V/72mA and 40V/12mA are sup-

plied.

The converter offers short-circuit protection (short-

circuit on 40V output doesn’t affect 5V output and

the input power never exceeds the limits of the

specification), input either voltage polarity, 80%

minimum efficiency at maximum load, input and

output filtering to meet very stringent noise require-

ments.

When the input voltage is below 18V, the converter

offers a very high input impedance and a maximum

quiescent current of 10

µAaccording to the standard

ETR 080.

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.

vided between input to output 2 and between output

1 and output 2. No insulation is provided between

input and output 1.

The design of the module has been conducted

using, as reference standards, the following:

EN 60950, VDE0878 part 1 class B (EMC),

EN55022 class B (EMC), CCITT 430, ETS 300 012

and ETS 300 047 (ISDN BASIC ACCESS, Safety

and Protection); anyway, please note that no certi-

fication processes have been carried out on the

module itself.