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L432VB Datasheet

  • L432VB

  • 1.24V Low-Voltage Adjustable Precision Shunt Regulator

  • 11頁

  • ETC

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NIKO-SEM
1.24V Low-Voltage Adjustable
Precision Shunt Regulator
FEATURES
L432
GENERAL DESCRIPTION
The L432 is a three-terminal adjustable shunt
regulator utilizing an accurate 1.24V band gap
reference. The output voltage can be set to any
value between 1.24V (V
REF
) to 18V with two
external resistors as shown in the typical
application circuit. The device exhibit a wide
operating current range of 0.2 to 100 mA with a
typical dynamic impedance of 0.25惟. Active
output circuitry provides a very sharp turn-on
characteristic, making the L432 excellent re-
placements for low-voltage zener diodes in
many applications, including on-board regulat-
ion and adjustable power supplies.
When used with an opto-coupler, the L432 is
ideal voltage reference in isolated feedback
circuits for 3.3V switching-mode power supplies.
The L432 shunt regulator is available in two
voltage tolerances (0.5% & 1.0%) and three
package options (TO-92, SOT-23-3 and SO-8).
Internal amplifier with 100 mA capability
Programmable output voltage to 18V
0.25惟 typical output impedance
Pin to pin compatible with TLV431A,
TS431, SC431L & AS432
Trimmed bandgap design 0.5% & 1.0%
with three package options
Low output noise
APPLICATIONS
Linear regulator controller
Precision voltage reference
Switching power supplies
Battery operating equipment
Instrumentation
PCs, Computer disk drives
SYMBOL & BLOCK DIAGRAM
Cathode (K)
Reference
(R)
+
Cathod
(K)
Reference (R)
-
1.24 Vref
Anode (A)
Anode (A)
SYMBOL
FUNCTIONAL BLOCK DIAGRAM
1
NOV-21-2001

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