Datasheet

150 Ω
I
KA
R1 = 10 kΩ
R2
C
L
V
BATT
I
KA
C
L
V
BATT
150 Ω
TEST CIRCUIT FOR CURVE A
TEST CIRCUIT FOR CURVES B, C, AND D
50
40
10
0
0.001 0.01 0.1 1
70
90
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)
100
10
30
80
60
20
T
A
= 25°C
B
Stable
Stable
A V
KA
= V
ref
B V
KA
= 5 V
C V
KA
= 10 V
D V
KA
= 15 V
f
C
L
− Load Capacitance − µF
A
C
D
− Cathode Current − mA
I
KA
+
−
+
−
3
2
1
0
−1 0 1 2 3 4
Input and Output V oltage − V
4
5
PULSE RESPONSE
6
5 6 7
Input
Output
T
A
= 25°C
220 Ω
50 Ω
GND
Output
Pulse
Generator
f = 100 kHz
TEST CIRCUIT FOR PULSE RESPONSE
t − Time − µs
TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543M –AUGUST 2004–REVISED JULY 2012 www.ti.com
Figure 17.
A. The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ are adjusted
to establish the initial V
KA
and I
KA
conditions, with C
L
= 0. V
BATT
and C
L
then are adjusted to determine the ranges of stability.
Figure 18.
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