TL431, TL431A, TL431B
TL432, TL432A, TL432B
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SLVS543M –AUGUST 2004–REVISED JULY 2012
150 Ω
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
I
KA
100
+
−
A V = V
KA
ref
V
BATT
C
L
B V = 5 V
KA
90
80
70
C V = 10 V
KA
D V = 15 V
KA
f
B
T
A
= 25°C
60
50
TEST CIRCUIT FOR CURVE A
C
Stable
Stable
A
40
I
KA
A
R1 = 10 kΩ
150 Ω
30
20
10
D
C
L
+
−
B
R2
V
BATT
0
0.001
0.01
0.1
1
10
C
L
− Load Capacitance − µF
TEST CIRCUIT FOR CURVES B, C, AND D
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 VKA and IKA conditions, with CL = 0. VBATT and CL then are adjusted to determine the ranges of stability.
Figure 19.
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