TL431-W Datasheet, PDF (26/79 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543M – AUGUST 2004 – REVISED JULY 2012
6
T_A = 25°C
5
PULSE RESPONSE
Input
4
3
Output
2
1
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220 Ω
Pulse
Generator
f = 100 kHz
50 Ω
Output
GND
TEST CIRCUIT FOR PULSE RESPONSE
0
−1 0 1 2 3 4 5 6 7
t − Time − µs
Figure 17.
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, 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
T_A = 25°C
B
70
60
Stable
50
Stable
C
A
40
30
D
20
10
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 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.
26
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