TL431
TEST CIRCUIT
INPUT
I
KA
V
KA
LINEAR INTEGRATED CIRCUIT
UTC TL431
V
REF
For V
KA
=V
REF
V
KA
=V
REF
×(1+R
1
/R
2
)+I
REF×
R
1
For V
KA
≥V
REF
For I
KA(OFF)
APPLICATION CIRCUIT
V
OUT
=(1+R
1
/R
2
)×V
REF
Shutdown Regulator
V
OUT
=(1+R
1
/R
2
)×V
REF
Minimum V
OUT
=V
REF
+5V
Output Control of a Three
-Terminal Fixed Regulator
V
OUT
V
OUT
=(1+R
1
/R
2
)×V
REF
Higher-current Shunt Regulator
V
IN
I
OUT
V
IN
I
OUT
R
CL
V
OUT
R
S
R
S
UTC
TL431
I
OUT
=V
REF
/R
S
Constant-current Sink
UTC
TL431
I
OUT
=V
REF
/R
CL
Current Limiting or Current Source
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