POWER I.C.
鈭?/div>
V
IN,OUT
400 V
I
LIM
40 mA
V
OUT
1.25 to V
IN
-30 V
2
3
3
INPUT VOLTAGE UP TO 400 V DC OR 285 V
RMS RECTIFIED
s
OUTPUT VOLTAGE ADJUSTABLE FROM 1.25
TO V
IN
-30V
s
OUTPUT CURRENT LIMITED TO 40 mA
s
THERMAL SHUT-DOWN PROTECTION
s
SHORT CIRCUIT PROTECTION
s
1
TO-220
ISOWATT220
1
2
3
1
DESCRIPTION
The VB408, VB408B, VB408FI are fully protected
positive adjustable voltage regulators made using a
proprietary High Voltage VIPower鈩?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,
D2PAK
ORDER CODES :
VB408
TO-220
ISOWATT220
VB408FI
D2PAK
VB408B
start-up circuits, pneumatic valve drivers and current
sources. The device is able to drive resistive or inductive
loads with an output voltage from 1.25V to V
IN
-30V
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.
BLOCK DIAGRAM
V
IN
Power
Stage
BIAS
CIRCUIT
CURRENT
SENSE
V
OUT
Current
Limitation
+
_
Thermal
RE F 3
REF 2
+
_
Protection
C ontrol
Signal
+
_
RE F 1
AD J
FC00410
September 1999
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