Datasheet

TL431−Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302D − MARCH 2005 − REVISED MARCH 2013
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
50
40
10
0
0.001 0.01 0.1 1
70
90
STABILITY BOUNDARY CONDITIONS
†
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)
100
10
30
80
60
20
T
A
= 25°C
B
Stable
Stable
A V
KA
= V
ref
B V
KA
= 5 V
C V
KA
= 10 V
D V
KA
= 15 V
f
C
L
− Load Capacitance − μF
A
C
D
150 Ω
I
KA
R1 = 10 kΩ
R2
C
L
V
BATT
I
KA
C
L
V
BATT
150 Ω
TEST CIRCUIT FOR CURVE A
TEST CIRCUIT FOR CURVES B, C, AND D
− Cathode Current − mA
I
KA
+
−
+
−
50
40
10
0
0.001 0.01 0.1 1
70
90
STABILITY BOUNDARY CONDITIONS
†
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
100
10
30
80
60
20
Stable
A V
KA
= V
ref
B V
KA
= 5 V
C V
KA
= 10 V
D V
KA
= 15 V
f
C
L
− Load Capacitance − μF
A
C
D
150 Ω
I
KA
R1 = 10 kΩ
R2
C
L
V
BATT
I
KA
C
L
V
BATT
150 Ω
TEST CIRCUIT FOR CURVE A
TEST CIRCUIT FOR CURVES B, C, AND D
− Cathode Current − mA
I
KA
†
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
KA
and I
KA
conditions with C
L
= 0. V
BATT
and
C
L
then were adjusted to determine the ranges of stability.
+
−
+
−
B
A
T
A
= 25°C
Stable
B
Figure 16