ZTL431 ZETEX [Zetex Semiconductors], ZTL431 Datasheet - Page 7

• Manufacturer Part Number: ZTL431
• Description: Cost effective adjustable precision shunt regulator
• Manufacturer: ZETEX [Zetex Semiconductors]

DC test circuits
Notes
Deviation of reference input voltage, Vdev, is
defined as the maximum variation of the
reference
temperature range.
The average temperature coefficient of the
reference input voltage, V
The dynamic output impedance, R
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'
Stability boundary
The ZTL431 and ZTL432 are stable with a
range of capacitive loads. A zone of instability
exists
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.
Issue 8 - April 2007
© Zetex Semiconductors plc 2007
V
R
R'
Figure 1 Test circuit for
REF
z
z
=
=
(
V
as
ppm°C
ΔV
--------- -
I
V
REF
ΔI
R
REF
z
, is defined as:
KA
z
z
input
⎛
⎝
z
demonstrated
I
= V
1
L
+
REF
R1
------ -
R2
)
voltage
=
⎞
⎠
I
KA
V
------------------------------------------------ -
V
DEV
KA
V
ref
REF
is defined as:
in
×
over
(
1 000 000
T1 T2
,
the
–
the
,
typical
Figure 2 Test circuit for
z
)
, is
full
V
I
KA
REF
V
7
REF
> V
I
L
REF
I
KA
V
KA
ZTL431, ZTL432
Figure 3 Test circuit for
off state current
www.zetex.com
I
KA(OFF)
V
KA