PL432XA3 Datasheet, PDF (1/9 Pages) Cystech Electonics Corp. – Adjustable shunt regulator

cys_tek ^{CYStech Electronics Corp.}
Adjustable shunt regulator
PL432XA3/N3
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 1/9
Description
Features
The PL432 is a three terminal adjustable shunt
◆Low voltage operation(down to 1.24V)
regulator with thermal stability guaranteed over
◆Wide operating current range 80μA to 100mA
temperature. The output voltage can be adjusted
◆Low dynamic output impedance 0.05Ω typ.
to any value from 1.24V(VREF) to 20V with two
◆Trimmed bandgap design ±0.25%
external resistors. The PL432 has a typical dynamic ◆Upgrade for PL431
output impedance of 0.05Ω. Active output circuitry ◆Available in TO-92 and SOT-23 packages
provides a very sharp turn on characteristic, making
the PL432 an excellent replacement for zener diodes. Applications
The PL432 shunt regulator is available with four
◆Linear Regulators
Voltage tolerances(0.25%,0.5%,1% and 2%), and two ◆Adjustable Supplies
package options(TO-92 and SOT-23). This allows the ◆Switching Power Supplies
designer the opportunity to select the optimum combi- ◆Battery Operated Computers
nation of cost and performance for their application. ◆Instrumentation
◆ Computer Disk Drives
Typical Application Circuit(Note 1,2)
R
VIN
R1
VREF
PL432
R2
GND
Notes:
VOUT ^{1) Set VOUT according to the following equation:}
VOUT=VREF(1+R1/R2)+IREFR1
2) Choose the value for R as follows:
˙The maximum limit for R should be such that the
cathode current, Iz, is greater than the minimum
operating current(80μA) at VIN(MIN).
˙The minimum limit for R should be as such that Iz
does not exceed 100mA under all load conditions,
and the instantaneous turn-on value for Iz does not
exceed 150mA. Both of the following conditions
must be met:
Rmin≥VIN(max)/150mA(to limit instantaneous
turn-on Iz)
Rmin≥ VIN(max)-VOUT (to limit Iz under
IOUT(min)+100mA normal operating
conditions)
PL432XA3/N3
CYStek Product Specification