GS2TX-9A

2 W LAN DC-DC CONVERTER

April 1997

1/2

Type

GS2TX-9A

4,5 to 15,75 V

– 9 V

– 250 mA

DESCRIPTION

The GS2TX-9A is a 2.25W unregulated DC-DC

converter designed to provide power, voltage regu-

lation and isolation for Local Area Network

(CHEAPERNET and ETHERNET) transceivers

from a wide range of input voltage, according to

IEEE 802.3 Standard.

An internal network is added to guarantee soft start

at switch-on.

° C unless otherwise specified)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Vi

Input Voltage

Vo = 9V

Io = 0 to – 250mA

4.5

15.75

V

Iir

Input Reflected

Current

Vi = 5V

Vo = – 9V

Io = – 250mA

25

30

mApp

lir

Input Reflected

Current

Vi = 12V

Vo = – 9V

Io = – 250mA

2

5

mApp

Vo

Output Voltage

Vi = 4.5 to 15.75V

Io = 0 to – 250mA

– 8.55

– 9.00

– 9.45

V

Vor

Output Ripple

Voltage

Vi = 5V

Io = – 250mA

710

Vor

Output Ripple

Voltage

Vi = 12V

Io = – 250mA

25

Line Regulation

Vi = 4.5 to 5.5V

Io = – 250mA

5mV

Load Regulation

Vi = 4.5 to 15.75V

Io = – 20 to – 250mA

5mV

Io

Output Current*

Vi = 4.5 to 15.75V

Vo = – 9V

0

– 250

mA

Vis

Isolation Voltage

2500

η

Efficiency

Vi = 5V

Io = – 250mA

70

73

%

η

Efficiency

Vi = 12V

Io = – 250mA

75

80

%

Top

Operating Ambient

Temperature Range

0

+70

°C

Tstg

Storage Temperature

Range

– 40

+85

°C

* When the input voltage is <5V and the output current is less than 20mA, the output ripple voltage increases due to discontinuous operation.