ꢀ ꢁ ꢂ ꢃꢄ ꢅ ꢀ ꢁ ꢂ ꢃꢄ ꢆꢅ ꢀꢁ ꢂ ꢃ ꢄꢇ ꢅ ꢀꢁ ꢂ ꢃ ꢈꢅ ꢀꢁ ꢂ ꢃ ꢈꢆꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢇ
ꢆ ꢉꢊꢋ ꢌꢀꢆ ꢇ ꢁꢍ ꢎ ꢏꢍ ꢐꢑ ꢌꢑ ꢒ ꢓ ꢌ ꢔꢋꢓ ꢀ ꢏꢍ ꢕ ꢋꢁ ꢆꢀꢒ ꢏꢌ
SLVS543A – AUGUST 2004 − REVISED AUGUST 2004
TYPICAL CHARACTERISTICS
†
STABILITY BOUNDARY CONDITIONS
150 Ω
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)
I
KA
100
A V
B V
C V
D V
= V
ref
KA
KA
KA
KA
+
−
T
A
= 25°C
= 5 V
V
BATT
90
80
70
C
L
= 10 V
= 15 V
f
B
Stable
60
50
C
Stable
A
TEST CIRCUIT FOR CURVE A
40
I
KA
R1 = 10 kΩ
150 Ω
30
20
D
C
L
+
−
10
0
R2
V
BATT
0.001
0.01
0.1
1
10
C
− Load Capacitance − µF
L
TEST CIRCUIT FOR CURVES B, C, AND D
†
STABILITY BOUNDARY CONDITIONS
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
150 Ω
100
A V
B V
C V
D V
= V
ref
KA
KA
KA
KA
= 5 V
I
90
80
70
KA
= 10 V
= 15 V
+
f
V
BATT
C
L
B
Stable
−
T
A
= 25°C
60
50
C
Stable
A
TEST CIRCUIT FOR CURVE A
40
A
30
20
10
D
I
KA
R1 = 10 kΩ
150 Ω
B
C
L
0
+
−
0.001
0.01
0.1
1
10
R2
V
BATT
C
− Load Capacitance − µF
L
†
The areas under the curves represent conditions that may cause the
device to oscillate. For curves B, C, and D, R2 and V+ were adjusted
to establish the initial V
and I
conditions with C = 0. V and
KA
KA
L
BATT
TEST CIRCUIT FOR CURVES B, C, AND D
C
then were adjusted to determine the ranges of stability.
L
Figure 16
22
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