STC
431
APPLICATION CIRCUIT
Vi
Vo
LINEAR INTEGRATED CIRCUIT
Vi
IN
Vo
Vi
R1
LM
7805
COMMON
OUT
R1
Vo
R1
V
REF
R2
STC
431
STC
431
V
REF
R2
V
REF
R2
STC
431
Vo=(1+R1/R2)*V
REF
Vo=(1+R1/R2)*V
REF
Vo=(1+R1/R2)*V
REF
Fig 7 Shutdown Regulator
Fig 8 Output Control of a Three
-Terminal Fixed Regulator
Fig 9 Higher-current Shunt Regulator
Vi
Io
Vi
Vo
Rs
Io
RCL
Vo
Rs
STC
431
I
O
=V
REF
/R
S
STC
431
R
S
=V
REF
/RCL
Fig 1 0 Constant-current Sink
Fig 11 Current Limiting or Current Source
TEST CIRCUIT
INPUT
I
KA
R1
STC
431
V
KA
INPUT
I
KA
V
KA
INPUT
V
KA
I
KA(OFF)
I
REF
STC
431
STC
431
V
REF
R2
V
REF
V
KA=
V
REF*(
1
+
R1
/
R2
)+
I
REF*
R1
Fig 12 Test Circuit For V
KA
=V
REF
Fig 1 3 Test Circuit for V
KA >=
V
REF
Fig 14Test Circuit For I
KA(OFF)
4.
SUNTAC [ SUNTAC ELECTRONIC CORP. ]
