Datasheet

50
40
10
0
0.001 0.01 0.1 1
70
90
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
100
10
30
80
60
20
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
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
− Cathode Current − mA
I
KA
+
−
+
−
B
A
T
A
= 25°C
Stable
B
TL431, TL431A, TL431B
TL432, TL432A, TL432B
www.ti.com SLVS543M –AUGUST 2004–REVISED JULY 2012
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 19.
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