AN74
8
Rev. 0.2
In
tV
cc
In
tV
cc
-24V
dc
DC_I
np
u
t
-96V
dc
VB
HI
VBLO
DC_I
nput
_Diod
e
VDD
VBR
NG
VBLO
VB
HI
T
u
rn-on at 9V
T
urn-off at 8.2V
T1: 10uH
L
2
a
n
d
C
1
6
o
p
tional
for l
ower output noi
se.
In
Pr
ot
o
:
R
23
=
20.
5k
R
22
=
1.
1k
C
5
=
2 x
1uF /
100V
in parallel
R
4
=
3
x
1
0
k i
n
s
e
ries
Q
2
is
u
pside-down
36
k =
500kHz
20k
=
1
M
H
z
1
0
~
15Vdc
In
put
JS
4
CONN SO
C
K
E
T
5
x2
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
C5
2
.2uF,
100V
C1
6
1
0uF,
25V
JS
3
CONN SO
C
K
E
T
5
x2
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
R4
30
k
C24
330uF
3
5
V
L2
10u
H
C2
0
6
8
0pF
JP
1
1
1
3
3
U2
LTC3704EMS
Run
1
NFB
3
Ith
2
Gnd
6
Sense
10
Gate
7
IntVcc
8
Vin
9
Freq
4
Mode/Sync
5
C2
2
.0
1uF
C2
1
4
.7
u
F,
10V
R2
1
82
k
C1
9
4.
7u
F
, 5
0
V
R20
.0
15,
5%
JS
1
CONN SO
C
K
E
T
5
x2
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
R1
5
10
k
R2
3
34.
8k
, 1
%
R2
2
1.
87
k,
1
%
Q2
S
i4
4
80DY
4
5
1
6
2
3
7
8
D4
ES
1
D
D3
B340
R1
8
36
k
T1D
4
9
R1
7
4.
7
T1C
3
10
C1
8
0.
1
u
F
T1F
6
7
T1
E
5
8
C1
4
.001uF
T1
B
2
11
D1
2
B
1
1
00B
C1
7
10uF,
25V
JS
2
CONN SO
C
K
E
T
2
x2
1
1
3
3
2
2
4
4
R1
4
82
k
R1
3
16
k
JS
5
CONN SO
C
K
E
T
5
x2
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
T1
A
VP5
1
12
Figure
6.
C
ost-
O
ptimi
zed Dua
l Outp
ut Battery Supply
