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PL432xA3 데이터시트 PDF




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부품번호 PL432xA3 기능
기능 Adjustable shunt regulator
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PL432xA3 데이터시트, 핀배열, 회로
cystek 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
GND
R2
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:
RminVIN(max)/150mA(to limit instantaneous
turn-on Iz)
RminVIN(max)-VOUT (to limit Iz under
IOUT(min)+100mA normal operating
conditions)
PL432XA3/N3
CYStek Product Specification




PL432xA3 pdf, 반도체, 판매, 대치품
cystek CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 4/9
SOT-23(Top View)
2 Cathode
Anode
3
1
Reference
TO-92(Top View)
Cathode
3
Anode
2
Reference
1
Block Diagram
Cathode
REF
VREF
Anode
Symbol
Cathode
REF
Anode
Ordering Information
Package
TO-92
SOT-23
0.25%
PL432DA3
PL432DN3
Tolerance
0.5%
1%
PL432CA3 PL432BA3
PL432CN3 PL432BN3
2%
PL432AA3
PL432AN3
PL432XA3/N3
CYStek Product Specification

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PL432xA3 전자부품, 판매, 대치품
cystek CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 7/9
Test Circuit-Small-Signal Gain and Phase
Test Circuit-Stability
10μF 15k
Iz
PL432
OUT
232
8.25k
R
Iz
PL432
R1
CL
R2
GND
Applications Information - Stability
Selection of load capacitance when using PL432 as a shunt regulator
When the PL432 is used as a shunt regulator, two options for selection of CL(see diagram on page 6)
are recommended for optimal stability:
1) No load capacitance across the device, decouple at the load.
2) Large capacitance across the device, optimal decoupling at the load.
The reason for this is that PL432 exhibits instability with capacitances in the range of 10nF to 1μF
(approx.) at light cathode currents(up to 3mA typical). The device is less stable the lower the cathode
voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode
current of (say) 10mA with a 0.1μF capacitor across it, it will oscillate transiently during start-up as the
cathode current passes through the instability region. Selecting a very low (or preferably, no) capaci-
tance, or alternatively a high capacitance(such as 10μF) will avoid this issue altogether. Since the user
will probably wish to have local decoupling at the load anyway, the most cost effective method is to use
no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the
local load decoupling from causing the oscillation during the transient start-up phase.
Note : if the PL432 is located right at the load, so the load decoupling capacitor is directly across it, then
this capacitor will have to be 1nF or 10μF.
PL432XA3/N3
CYStek Product Specification

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부품번호상세설명 및 기능제조사
PL432xA3

Adjustable shunt regulator

Cystech Electonics
Cystech Electonics

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