HT1087 Series
Application Circuits
Basic Circuits
·
Variable voltage type
V
IN
V IN
C 1
1 0
m
F
H T 1 0 8 7 -A D J
A D J
I
A
D J
V O U T
V
R E F
V
R 1
1 2 5
W
R 2
1 k
W
C 2
1 0
m
F
O U T
C o m m o n
S in g le p o in t G N D
C o m m o n
V
OUT
= V
REF
( 1 +
Note:
R2
) + I
ADJ
R2
R1
C1 is required if the needed if the device is located far from filter capacitors, the recommended value is 10mF.
C2 is required for stability, the recommended value is 10mF.
R1 is required for regulation, the recommended value is 125W.
·
Fixed voltage type
V
IN
V IN
H T 1 0 8 7
S e r ie s
G N D
V O U T
V
O U T
C 1
1 0
m
F
C 2
1 0
m
F
C o m m o n
S in g le p o in t G N D
C o m m o n
Note:
C1 is required if the needed if the device is located far from filter capacitors, the recommended value is 10mF.
C2 is required for stability, the recommended value is 10mF.
Typical Application Circuits
·
1.25~10.5V regulator
2 .7 5 V
£
V
IN
£
1 2 V
C 1
1 0
m
F
V IN
H T 1 0 8 7 -A D J
A D J
I
A
D J
V O U T
V
R E F
V
R 1
1 2 5
W
R 2
1 k
W
C 2
1 0
m
F
O U T
C o m m o n
S in g le p o in t G N D
C o m m o n
V
OUT
= V
REF
( 1 +
R2
) + I
ADJ
R2
R1
Rev. 1.20
4
April 7, 2008
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
