September 1999

1/8

®

VB408

HIGH VOLTAGE LINEAR REGULATOR

POWER I.C.

s

INPUT VOLTAGE UP TO 400 V DC OR 285 V

RMS RECTIFIED

s

OUTPUT VOLTAGE ADJUSTABLE FROM 1.25

s

OUTPUT CURRENT LIMITED TO 40 mA

s

THERMAL SHUT-DOWN PROTECTION

s

SHORT CIRCUIT PROTECTION

DESCRIPTION

The VB408, VB408B, VB408FI are fully protected

positive adjustable voltage regulators made using a

proprietary High Voltage VIPower

™ technology. The

device can be connected to a D.C. source (up to 400V) or

in off-line application directly to the rectified main (110V/

230V). It is particularly suitable to be used in the

manufacture of DC/DC converters, AC/DC converters,

start-up circuits, pneumatic valve drivers and current

sources. The device is able to drive resistive or inductive

providing an internally limited output current; it has built in

short circuit and thermal shutdown protections. The

device does not provide galvanic insulation from main.

TYPE

∆V

IN,OUT

VB408

VB408FI

VB408B

400 V

40 mA

1

PRELIMINARY DATA

BLOCK DIAGRAM

FC 00410

AD J

BIAS

CIRCUIT

CURRENT

SENSE

+

_

+

_

RE F 1

+

_

Thermal

Protection

Control

Signal

Power

Stage

Current

Limitation

REF 2

RE F 3

TO-220

1

2

3

1

2

3

ISOWATT220

ORDER CODES :

ISOWATT220

VB408FI

TO-220

VB408

D2PAK

VB408B

1

3

D2PAK