DC1288A - Schematic

1
2
PVIN
*
PVIN
TP1
C1
1uF
50V
GND
+
TG2 17
SW2 20
OVP2 11
TG2
CAP1 15
LED1 14
CAP1
SW2
6 FADJ
OVP2
1
JP2
FADJ
C3
2.1MHz
ADJUST
1
3
2
R18
100K
Frequency
Adjust
R12 18.2K
C4
1000PF
R14 18.2K
C5
1000PF
R15 18.2K
9 VC1
TG1 13
SW1 16
8 VC2
7 VC3
OVP1 12
LED1
TG1
SW1
OVP1
3
TG3 1
1
LED3
0.51
2
PVIN
L1
2
15uH
1
D1
3
LED2L+
LED2L-
3
C2
1uF
50V
(OPT)
LED1H+
2
BOOST
TP19 TP20
R1
7.15M
TP3
Q1
LED1HTP4
OVP1
R2
0.51
JP4
MODE
BUCK/BOOST
2
LED1L+
LED1L-
3
JP3
MODE
BUCK/BOOST
2
BOOST
TP17 TP18
R10
191K
3
2
1000PF
TP11 TP12
OVP2
C11
2.2uF
25V
29 GND
VREF
R11
7.15M
R13
R17
191K
27 PWM3
TP10
PVIN
C6
1uF
50V
(OPT)
Q2
LED2H-
1
LED2
1
D2
LED2H+
PVIN
TP9
2
15uH
C12
2.2uF
25V
3
TP8
L2
PVIN
PWM2
PWM3
1 PWM1
28 PWM2
CAP2
BOOST
TP21 TP22
1
CAP2 19
LED2 18
R22 R23 R24
(OPT) (OPT) (OPT)
PWM1
OVP3
A
BUCK/BOOST
2
SW3
PVIN
3 CTRL3
TP7
3
JP5
MODE
TG2 1
TP6
TG3
LED3L-
1
CTRL3
OVP3
LED3L+
TG1
CTRL2
5 CTRL1
4 CTRL2
TP5
TP13 TP14
2
R21
191K
SW1
CTRL1
C7
0.1uF
LED3
R19
7.15M
0.51
LED2
3
R4
R5
R6
R7
R8
R9
100K 100K 100K 100K 100K 100K
TG3 24
SW3 21
OVP3 10
CAP3
C8
1uF
50V
(OPT)
D3
R20
LED1
VREF
R3
10K
CAP3 22
LED3 23
26 SHDN
2 VREF
15uH
Q3
LED3H-
CAP2
SHDN
2
L3
1
LED3H+
CAP1
25 VIN
1
ON
OFF
LT3496EUFD
2
PVIN
U1
TP16
PVIN
C13
2.2uF
25V
CAP3
C9
1uF
6.3V
SW3
GND
VIN
JP1
LEDs
VIN
TP15
SW2
VIN
3V-5.5V
A
PVIN
TP2
PVIN
C10
4.7uF
63V
(OPT)
B
B
* Refer to QSG for PVIN Range.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
CONTRACT NO.
APPROVALS
DRAWN
DATE
HELEN
5/05/07
Walker Bai
5/05/07
CHECKED
TECHNOLOGY
TITLE
LT3496EUFD
Triple Boost or Buck/Boost LED Driver
APPROVED
ENGINEER
DESIGNER
Monday, August 27, 2007
2
SIZE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
CAGE CODE
SCALE:
FILENAME:
DWG NO
REV
A
DC1288A
SHEET
1
OF
1
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