TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543M –AUGUST 2004–REVISED JULY 2012
www.ti.com
PULSE RESPONSE
6
5
4
3
2
1
0
T
A
= 25°C
Input
220 Ω
50 Ω
Output
Pulse
Generator
f = 100 kHz
Output
GND
TEST CIRCUIT FOR PULSE RESPONSE
−1
0
1
2
3
4
5
6
7
t − Time − µs
Figure 17.
150 Ω
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)
I
KA
100
+
−
A V
= V
ref
KA
T
A
= 25°C
V
BATT
C
L
B V = 5 V
KA
90
80
70
C V = 10 V
KA
D V = 15 V
KA
f
B
Stable
60
50
TEST CIRCUIT FOR CURVE A
C
Stable
A
I
40
KA
R1 = 10 kΩ
150 Ω
30
20
10
D
C
L
+
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 18.
26
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