TL431B Datasheet, PDF (22/40 Pages) Texas Instruments – ADJUSTABLE PRECISION SHUNT REGULATORS

TL431, TL431A, TL431B, TL432, TL432A, TL432B
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS543A – AUGUST 2004 − REVISED AUGUST 2004
TYPICAL CHARACTERISTICS
STABILITY BOUNDARY CONDITIONS^†
FOR ALL TL431 AND TL431A DEVICES
(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)
100
A VKA = Vref
90 ^{B VKA = 5 V}
C VKA = 10 V
80 ^{D VKA = 15 Vf}
TA = 25°C
B
70
60
Stable
50
Stable
C
A
40
30
D
20
10
0
0.001
0.01
0.1
1
10
CL − Load Capacitance − µF
150 Ω
IKA
+
CL
VBATT
−
TEST CIRCUIT FOR CURVE A
IKA
R1 = 10 kΩ
150 Ω
CL
R2
+
VBATT
−
TEST CIRCUIT FOR CURVES B, C, AND D
STABILITY BOUNDARY CONDITIONS^†
FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES
100
A VKA = Vref
90 ^{B VKA = 5 V}
C VKA = 10 V
80 ^{D VKA = 15 Vf}
70
TA = 25°C
60
Stable
50
A
40
30
20
10
B
C
Stable
A
D
B
0
0.001
0.01
0.1
1
10
CL − Load Capacitance − µF
† _{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 VKA and IKA conditions with CL = 0. VBATT and
CL then were adjusted to determine the ranges of stability.
Figure 16
150 Ω
IKA
+
CL
VBATT
−
TEST CIRCUIT FOR CURVE A
IKA
R1 = 10 kΩ
150 Ω
CL
R2
+
VBATT
−
TEST CIRCUIT FOR CURVES B, C, AND D
22
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