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TL432K3-A-TB-G Datasheet(PDF) 7 Page - Cystech Electonics Corp.

Part # TL432K3-A-TB-G
Description  Adjustable shunt regulator
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Manufacturer  CYSTEKEC [Cystech Electonics Corp.]
Direct Link  http://www.cystekec.com
Logo CYSTEKEC - Cystech Electonics Corp.

TL432K3-A-TB-G Datasheet(HTML) 7 Page - Cystech Electonics Corp.

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CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 7/15
TL432A3/N3/M3/K3
CYStek Product Specification
Test Circuit-Small-Signal Gain and Phase
Test Circuit-Stability
15k
8.25k
PL432
232
Iz
OUT
GND
10μF
TL432
Iz
R1
R2
PL432
R
CL
TL432
Applications Information - Stability
Selection of load capacitance when using TL432 as a shunt regulator
When the TL432 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 TL432 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 TL432 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.


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