TL431
Figure 1 : Test Circuit for V = V
Figure 2 : Test Circuit for V > V
REF
KA
REF
KA
Input
R
Output
IK
Input
R
Output
R1
IREF
IK=10mA
VKA
VKA
R2
VREF
VREF
R1
V
= V
(1 + ------- ) + R1 x I
R2
KA
REF
REF
Figure 4 : Test Circuit for Phase Margin and
Figure 3 : Test Circuit for I
OFF
Voltage Gain
VKA=36V
10µF
IK=10mA
IOFF
10µF
Input
VREF
Figure 6 : Test Circuit for Response time
Figure 5 : Block diagram of TL1431
Cathode
IK=1mA
Vref
+
-
1 mA
0 mA
Vref
Anode
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