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3
2
1
0
0 1 2 3 4
4
5
PULSE RESPONSE
6
5 6 7
TEST CIRCUIT FOR PULSE RESPONSE
T
A
= 25°C
Input
Output
Input and Output Voltages − V
t − Time − µs
Pulse
Generator
f = 100 kHz
50 Ω
220 Ω
Output
GND
V
I
STABILITY BOUNDARY CONDITIONS
†
50
40
10
0
0.001 0.01 0.1 1
70
90
100
10
30
80
60
20
TEST CIRCUIT FOR CURVE A
TEST CIRCUIT FOR CURVES B, C, AND D
C
L
− Load Capacitance − µF
A-V
KA
= V
I(ref)
B-V
KA
= 5 V
C-V
KA
= 10 V
D-V
KA
= 15 V
Stable
Stable
A
B
C
D
I
KA
= 10 mA
T
A
= 25°C
C
L
C
L
150 Ω
150 Ω
I
KA
I
KA
V
BATT
V
BATT
R1 =
10 kΩ
R2
+
−
+
−
V
I
V
I
†
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.
− Cathode Current − mAI
KA
TL1431-EP
PRECISION PROGRAMMABLE REFERENCE
SLVS529C – APRIL 2004 – REVISED DECEMBER 2006
Figure 14.
Figure 15.
11
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