TL431_10 Datasheet, PDF (27/75 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

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TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543K – AUGUST 2004 – REVISED JUNE 2010
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
100
A V_KA = V_ref
90 ^{B V}KA ^{= 5 V}
C V_KA = 10 V
80 ^{D V}KA ^{= 15 V}f
70
T_A = 25°C
60
Stable
50
A
40
30
20
10
B
C
Stable
A
D
B
0
0.001
0.01
0.1
1
10
150 Ω
I_KA
+
C_L
V_BATT
−
TEST CIRCUIT FOR CURVE A
R1 = 10 kΩ
C_L
R2
I_KA
150 Ω
+
V_BATT
−
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 16.
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