6
dc1523af
DEMO MANUAL DC1523A
SCHEMATIC DIAGRAMS
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
CIRCUITRY
O
N
THIS
S
IDE
MUS
T
CO
NNE
CT TO
POW
E
R
GN
D
G
R
O
UNDP
L
A
NE
CIRCUITRY
O
N
THIS
S
IDE
MUS
T
CO
NNE
CT TO
SI
GN
AL GN
D
G
R
O
UNDP
L
A
NE
<
--
--
--
-
--
--
->
2.
INST
AL
L
SHUNT
S AS SHOW
N.
1.
A
L
L
R
E
S
IS
T
O
R
S
A
R
E
IN
O
H
M
S
, 0603.
AL
L
CAPACIT
O
RS ARE IN M
ICROF
ARADS,
0603.
NO
T
E
: UNL
E
S
S
O
T
HE
RW
IS
E
S
P
E
C
IF
IE
D
MO
DE
VOS+
VOS+
VOU
T
VI
N
VOU
T
INTV
CC
INTV
CC
VOU
T
INTV
CC
INTV
CC
VI
N
+
VI
N
+
VOU
T
1
INTV
CC
VI
N
BG2
TG
2
SW
2
CS
TG
1
SW
1
BG1
SI
ZE
DAT
E
:
IC NO
.
R
EV.
SHEET
O
F
TITLE:
A
PPR
OVA
L
S
P
CB DE
S
.
AP
P
E
N
G
.
T
E
CHNO
LO
G
Y
Fax:
(
408)
434-
0507
M
ilp
it
as,
C
A
95035
P
h
one:
(
408)
432-
1900
1630 M
cC
ar
thy B
lvd.
LTC
C
onf
ident
ial-
For
C
u
st
om
er
U
se O
n
ly
CUSTOMER NOTI
CE
LINE
AR TE
CHNO
LO
G
Y
HAS
MADE
A BE
S
T
E
FFO
RT TO
DE
S
IG
N
A
CIRCUIT THAT ME
E
T
S
CUS
TO
ME
R-
S
U
P
P
L
IE
D
SPEC
IF
IC
A
T
IO
N
S
;
H
O
W
EVER
, I
T
R
E
M
A
IN
S T
H
E C
U
S
T
O
M
E
R
'S R
ESPON
S
IB
IL
IT
Y T
O
V
E
R
IFY
P
R
O
P
E
R
AND RE
LIABLE
O
P
E
RATIO
N IN THE
ACTUAL
AP
P
L
ICATIO
N. CO
MP
O
N
E
N
T S
UBS
TITUTIO
N
AND P
R
INTE
D
CIRCUIT BO
ARD LAY
O
UT MAY
S
IG
N
IFICANTLY
AFFE
CT CIRCUIT
P
E
R
FO
RMANCE
O
R
RE
LIABILITY
. CO
NTACT LINE
AR
TE
CHNO
LO
G
Y
AP
P
L
ICATIO
NS
E
N
G
INE
E
R
ING
FO
R AS
S
IS
T
ANCE
.
THIS
CIRCUIT IS
P
R
O
P
RIE
T
ARY
TO
LINE
AR TE
CHNO
LO
G
Y
AND
SCHEM
A
T
IC
S
U
P
P
L
IE
D FO
R US
E
WITH LINE
AR TE
CHNO
LO
G
Y
P
ARTS
.
SCAL
E =
NONE
w
w
w
.line
ar
.c
om
3
Fr
id
ay,
N
ovemb
er
19,
2010
12
HI
G
H
E
F
F
ICI
E
NCY
S
T
E
P
-UP
/D
O
W
N DC/
DC CO
NV
E
R
T
E
R
AK
TAG
E
B.
N/
A
L
T
C
3789EGN
DEMO CI
RCUI
T 1523A
SIZE
DAT
E
:
IC NO
.
R
EV.
SHEET
O
F
TITLE:
A
PPR
OVA
L
S
P
CB DE
S
.
A
PP EN
G.
T
E
CHNO
LO
G
Y
Fax:
(
408)
434-
0507
M
ilp
it
as,
C
A
95035
P
h
one:
(
408)
432-
1900
1630 M
cC
ar
thy B
lvd.
LTC
C
onf
ident
ial-
For
C
u
st
om
er
U
se O
n
ly
CUSTOMER NOTI
CE
LINE
AR TE
CHNO
LO
G
Y
HAS
MADE
A BE
S
T
E
FFO
RT TO
DE
S
IG
N
A
CIRCUIT THAT ME
E
T
S
CUS
TO
ME
R-
S
U
P
P
L
IE
D
SPEC
IF
IC
A
T
IO
N
S
;
H
O
W
EVER
, I
T
R
E
M
A
IN
S T
H
E C
U
S
T
O
M
E
R
'S R
ESPON
S
IB
IL
IT
Y T
O
V
E
R
IFY
P
R
O
P
E
R
AND RE
LIABLE
O
P
E
RATIO
N IN THE
ACTUAL
AP
P
L
ICATIO
N. CO
MP
O
N
E
N
T S
UBS
TITUTIO
N
AND P
R
INTE
D
CIRCUIT BO
ARD LAY
O
UT MAY
S
IG
N
IFICANTLY
AFFE
CT CIRCUIT
P
E
R
FO
RMANCE
O
R
RE
LIABILITY
. CO
NTACT LINE
AR
TE
CHNO
LO
G
Y
AP
P
L
ICATIO
NS
E
N
G
INE
E
R
ING
FO
R AS
S
IS
T
ANCE
.
THIS
CIRCUIT IS
P
R
O
P
RIE
T
ARY
TO
LINE
AR TE
CHNO
LO
G
Y
AND
SCHEM
A
T
IC
S
U
P
P
L
IE
D FO
R US
E
WITH LINE
AR TE
CHNO
LO
G
Y
P
ARTS
.
SCAL
E =
NONE
w
w
w
.line
ar
.c
om
3
Fr
id
ay,
N
ovemb
er
19,
2010
12
HI
G
H
E
F
F
ICI
E
NCY
S
T
E
P
-UP
/D
O
W
N DC/
DC CO
NV
E
R
T
E
R
AK
TAG
E
B.
N/
A
L
T
C
3789EGN
DEMO CI
RCUI
T 1523A
SIZE
DAT
E
:
IC NO
.
R
EV.
SHEET
O
F
TITLE:
A
PPR
OVA
L
S
P
CB DE
S
.
A
PP EN
G.
T
E
CHNO
LO
G
Y
Fax:
(
408)
434-
0507
M
ilp
it
as,
C
A
95035
P
h
one:
(
408)
432-
1900
1630 M
cC
ar
thy B
lvd.
LTC
C
onf
ident
ial-
For
C
u
st
om
er
U
se O
n
ly
CUSTOMER NOTI
CE
LINE
AR TE
CHNO
LO
G
Y
HAS
MADE
A BE
S
T
E
FFO
RT TO
DE
S
IG
N
A
CIRCUIT THAT ME
E
T
S
CUS
TO
ME
R-
S
U
P
P
L
IE
D
SPEC
IF
IC
A
T
IO
N
S
;
H
O
W
EVER
, I
T
R
E
M
A
IN
S T
H
E C
U
S
T
O
M
E
R
'S R
ESPON
S
IB
IL
IT
Y T
O
V
E
R
IFY
P
R
O
P
E
R
AND RE
LIABLE
O
P
E
RATIO
N IN THE
ACTUAL
AP
P
L
ICATIO
N. CO
MP
O
N
E
N
T S
UBS
TITUTIO
N
AND P
R
INTE
D
CIRCUIT BO
ARD LAY
O
UT MAY
S
IG
N
IFICANTLY
AFFE
CT CIRCUIT
P
E
R
FO
RMANCE
O
R
RE
LIABILITY
. CO
NTACT LINE
AR
TE
CHNO
LO
G
Y
AP
P
L
ICATIO
NS
E
N
G
INE
E
R
ING
FO
R AS
S
IS
T
ANCE
.
THIS
CIRCUIT IS
P
R
O
P
RIE
T
ARY
TO
LINE
AR TE
CHNO
LO
G
Y
AND
SCHEM
A
T
IC
S
U
P
P
L
IE
D FO
R US
E
WITH LINE
AR TE
CHNO
LO
G
Y
P
ARTS
.
SCAL
E =
NONE
w
w
w
.line
ar
.c
om
3
Fr
id
ay,
N
ovemb
er
19,
2010
12
HI
G
H
E
F
F
ICI
E
NCY
S
T
E
P
-UP
/D
O
W
N DC/
DC CO
NV
E
R
T
E
R
AK
TAG
E
B.
N/
A
L
T
C
3789EGN
DEMO CI
RCUI
T 1523A
R
EVISION
H
IST
OR
Y
DESCRIPTIO
N
D
ATE
APPRO
VED
ECO
R
EV
TA
G
E
B
.
PRODUCT
ION
3
07-
02-
10
__
R
EVISION
H
IST
OR
Y
DESCRIPTIO
N
D
ATE
APPRO
VED
ECO
R
EV
TA
G
E
B
.
PRODUCT
ION
3
07-
02-
10
__
R
EVISION
H
IST
OR
Y
DESCRIPTIO
N
D
ATE
APPRO
VED
ECO
R
EV
TA
G
E
B
.
PRODUCT
ION
3
07-
02-
10
__
R1
1
1
0
R1
1
1
0
TP
7
GN
D
TP
7
GN
D
C4
0.
22uF
16V
C4
0.
22uF
16V
C1
0
2.
2uF
C1
0
2.
2uF
C6
3.
3uF
50V
1210
C6
3.
3uF
50V
1210
R2
9
3.
6
1206
R2
9
3.
6
1206
R2
6
10
R2
6
10
C2
2
0.
22uF
16V
C2
2
0.
22uF
16V
Q3
SiR
496D
P
Q3
SiR
496D
P
TP
1
2
EXT
VC
C
TP
1
2
EXT
VC
C
CF1
OPT
CF1
OPT
C2
6
OPT
1210
C2
6
OPT
1210
CC2
0.
01uF
CC2
0.
01uF
R5
15 Ohm
0805
R5
15 Ohm
0805
R7
100K
R7
100K
R9
1.
24K
R9
1.
24K
R2
5
0
R2
5
0
R1
4
100
R1
4
100
R1
0
1.
24K
R1
0
1.
24K
R8
10
R8
10
C1
3
1800pF
1206
C1
3
1800pF
1206
JP
1
ON
OF
F
RUN
JP
1
ON
OF
F
RUN
1
3
2
RC
14.
7K
RC
14.
7K
R6
OPT
R6
OPT
C1
22uF
16V
1210
C1
22uF
16V
1210
R2
8
5.
6 Ohm
1206
R2
8
5.
6 Ohm
1206
R1
5.
6
R1
5.
6
C2
3
OPT
1210
C2
3
OPT
1210
C1
8
10uF
1206
C1
8
10uF
1206
J3
VI
N
5V - 36V
J3
VI
N
5V - 36V
CS
S
0.
01uF
CS
S
0.
01uF
R2
7
OPT
R2
7
OPT
C1
6
22uF
1210
16V
C1
6
22uF
1210
16V
JP
2
B
PU
LSE
SKI
P
JP
2
B
PU
LSE
SKI
P
C3
OPT
1210
C3
OPT
1210
D7
D
F
LS160
D7
D
F
LS160
D6
B240A
D6
B240A
C7
O
P
T
C7
O
P
T
+
CO
UT1
330uF
16V
+
CO
UT1
330uF
16V
C1
1
OPT
C1
1
OPT
+
CIN1
270uF
50V
+
CIN1
270uF
50V
D5
B240A
D5
B240A
C5
3.
3uF
50V
1210
C5
3.
3uF
50V
1210
D8
BZ
X84C
5V1
D8
BZ
X84C
5V1
RFB
2
8.
06K
RFB
2
8.
06K
TP
8
INTV
CC
TP
8
INTV
CC
R2
0.
010
2%
R2
0.
010
2%
TP
3
VI
N
+
TP
3
VI
N
+
R1
8
0.
010
2%
R1
8
0.
010
2%
+
CIN2
OPT
+
CIN2
OPT
R1
2
OPT
R1
2
OPT
TP
6
VLOGI
C
TP
6
VLOGI
C
J4
GN
D
J4
GN
D
Q5
SiR
496D
P
Q5
SiR
496D
P
Q4
Si4840BD
Y
Q4
Si4840BD
Y
TP
5
SS
TP
5
SS
L1
4.
7uH
L1
4.
7uH
R2
1
121K
1%
R2
1
121K
1%
R3
0
33.
2K
R3
0
33.
2K
J1
VOU
T
12V @ 5A M
A
X
J1
VOU
T
12V @ 5A M
A
X
C1
2
390pF
1206
C1
2
390pF
1206
TP
1
1
SGN
D
TP
1
1
SGN
D
R
3
100
R
3
100
TP
2
VOS+
TP
2
VOS+
JP
2
C
CCM
JP
2
C
CCM
C8
O
P
T
C8
O
P
T
CC1
1000pF
CC1
1000pF
C2
5
3.
3uF
50V
1210
C2
5
3.
3uF
50V
1210
R2
2
OPT
R2
2
OPT
C1
5
1uF
50V
1210
C1
5
1uF
50V
1210
TP
4
PGOOD
TP
4
PGOOD
C9
3.
3uF
50V
1210
C9
3.
3uF
50V
1210
C1
7
22uF
1210
16V
C1
7
22uF
1210
16V
C2
7
OPT
1210
C2
7
OPT
1210
CF
OPT
CF
OPT
R2
0
0.
004
R2
0
0.
004
R1
3
100
R1
3
100
U1
LT
C
3789EGN
U1
LT
C
3789EGN
VFB
1
SS
2
SENSE1
+
3
SENSE1
-
4
ITH
5
SG
ND
6
M
O
D
E
/P
LLI
N
7
FR
EQ
8
RUN
9
VINSNS
10
VO
UTSNS
11
IL
IM
12
IO
SENSE+
13
IO
SENSE-
14
NC
15
SW
2
16
TG
2
17
B
OOS
T
2
18
BG
2
19
EXTVCC
20
INTVCC
21
VIN
22
PGND1
24
B
OOS
T
1
25
SW
1
27
P
GOOD
28
TG
1
26
BG
1
23
C2
22uF
16V
1210
C2
22uF
16V
1210
R2
4
10K
R2
4
10K
D2
BAS16
D2
BAS16
3
1
+
CO
UT2
330uF
16V
OPT
+
CO
UT2
330uF
16V
OPT
RFB
1
113K
RFB
1
113K
C2
4
1uF
C2
4
1uF
J2
GN
D
J2
GN
D
R4
100
R4
100
TP
1
VOS-
TP
1
VOS-
R3
1
12.
1K
R3
1
12.
1K
TP
1
0
PLLI
N
TP
1
0
PLLI
N
D4
D
F
LS160
D4
D
F
LS160
Q2
Si7884BD
P
Q2
Si7884BD
P
C1
4
0.
1uF
C1
4
0.
1uF
