HT71XX
Circuit for increasing output voltage
V
I
N
V
O
U
T
V
I
N
V
O
U
T
H
T
7
1
X
X
S
e
r
i
e
s
V
X
X
C
1
C
1
2
R
1
I
S
D
S
G
N
1
m
0 F
m
0 F
D
1
C
o
m
m
o
n
S
i
n
g
l
e
p
o
i
n
t
G
N
D
C
o
m
m
o
n
VOUT=VXX+VD1
Constant current regulator
V
I
N
V
I
N
V
O
U
T
H
T
7
1
X
X
S
e
r
i
e
s
C
1
G
N
D
C
1
2
V
X
X
R
A
I
S
S
I
O
U
T
1
m
0 F
m
0 F
R
L
C
o
m
m
o
n
VXX
RA
IOUT
=
+ ISS
Dual supply
I
C
1
V
I
N
V
V
I
N
V
O
U
T
H
T
7
1
X
X
S
e
r
i
e
s
V
V
O
U
T
1
I
C
2
G
N
D
C
1
3
m
0 F
V
I
N
U
T
H
T
7
1
XO
X
S
e
r
i
e
s
O
U
T
2
G
N
D
C
1
R
1
C
1
2
1
m
0 F
m
0 F
C
o
m
m
o
n
C
o
m
m
o
n
7
August 8, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
