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ZTL432AFFTA Datasheet(PDF) 7 Page - Zetex Semiconductors

Part # ZTL432AFFTA
Description  Cost effective adjustable precision shunt regulator
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Manufacturer  ZETEX [Zetex Semiconductors]
Direct Link  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZTL432AFFTA Datasheet(HTML) 7 Page - Zetex Semiconductors

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ZTL431, ZTL432
Issue 8 - April 2007
7
www.zetex.com
© Zetex Semiconductors plc 2007
DC test circuits
Notes
Deviation of reference input voltage, Vdev, is
defined as the maximum variation of the
reference
input
voltage
over
the
full
temperature range.
The average temperature coefficient of the
reference input voltage, Vref is defined as:
The
dynamic
output
impedance,
Rz, is
defined as:
When the device is programmed with two
external resistors, R1 and R2, (fig 2), the
dynamic output impedance of the overall
circuit, R'z, is defined as:
Stability boundary
The ZTL431 and ZTL432 are stable with a
range of capacitive loads. A zone of instability
exists
as
demonstrated
in
the
typical
characteristic graph on page 5. The graph
shows typical conditions. To ensure reliable
stability a capacitor of 4.7nF or greater is
recommended between anode and cathode.
Figure 1 Test circuit for
VKA = VREF
Figure 2 Test circuit for
VKA > VREF
Figure 3 Test circuit for
off state current
IKA
IKA
IKA(OFF)
IL
IL
VKA
VKA
VKA
VREF
VREF
IREF
IREF
V
REF ppm°C
()
V
DEV
1 000 000
,,
×
V
REF T1
T2
()
-------------------------------------------------
=
R
z
ΔV
z
ΔI
z
----------
=
R'
z
R
z 1
R1
R2
-------
+
⎝⎠
⎛⎞
=


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