DC1405A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
* Refer to QSG for PVIN Range.
REV
PVIN
PVIN
+
E2
C7
4.7uF
63V
Walker Bai
06-03-08
1
PRODUCTION
Walker Bai
10-21-09
C8
1uF
50V
D
PVIN
PVIN
SW3
L3
D3
VIN
27uH
E7
U1
LT3492EFE
GND
C9
28
VIN
LEDs
ON
CTRL2
CTRL3
VREF
R10
100k
1%
JP4
CTRL1
CAP3
R11
34k
1%
5
R12
34k
1%
R13
34k
1%
R14
100k
1%
R15
100k
1%
R16
100k
1%
8
E14
7
E15
6
R18
(Opt)
TG3
VREF
SW3
C10
0.1uF
6.3V
E13
R17
(Opt)
SHDN
OVP3
CTRL1
CAP2
CTRL2
CTRL3
LED2
R19
(Opt)
TG2
SW2
PWM1
PWM2
PWM3
E16
4
E17
3
E18
2
9
VREF
C11
R23
432k
1%
12
18.2K 1%
2200pF C12
R21
C13
R24
100k
1%
(1MHz)
R20
2200pF
2200pF
R22
11
18.2K 1%
10
18.2K 1%
PWM1
OVP2
25
CAP3
CAP1
FADJ
LED1
VC1
TG1
VC2
SW1
VC3
R9
2
3
1.65
1%
R7
7.15M
1%
26
LED3
27
TG3
LED3-
MODE3
1
BUCK/BOOST
E6
2
3
Q3
ZXMP6A13F
BOOST
JP3
24
SW3
13
OVP3
PVIN
PVIN
SW2
L2
D2
27uH
B1100
OVP1
C
PVIN
C3
2.2uF
25V
(Opt)
C4
1uF
100V
CAP2
21
LED2
OVP2
20
TG2
23
SW2
R5
124k
1%
14
OVP2
18
CAP1
17
LED1
16
TG1
SW1
OVP1
3
E11
LED2+
LED2-
MODE2
1
BUCK/BOOST
E12
PVIN
L1
D1
B1100
3
BOOST
JP2
TG2
PVIN
C1
2.2uF
25V
(Opt)
C2
1uF
100V
2
Q2
ZXMP6A13F
PVIN
SW1
27uH
15
2
1.65
1%
R4
7.15M
1%
CAP2
19
LED2
R6
22
CAP1
LED1
R3
2
3
1.65
1%
R1
7.15M
1%
E21
LED1+
LED1-
MODE1
1
BUCK/BOOST
E22
B
2
3
Q1
ZXMP6A13F
BOOST
JP1
TG1
OVP1
R2
124k
1%
GND
29
CUSTOMER NOTICE
A
APPROVALS
TECHNOLOGY
RB
Walker Bai
3
SCALE = NONE
2
A
TITLE: SCHEMATIC
TRIPLE BOOST OR BUCK/BOOST LED DRIVER
N/A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
SIZE
4
LED3+
TG3
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
5
E5
R8
124k
1%
PWM2
PWM3
LED3
OVP3
LED3
1
3
OFF
VIN
1uF
6.3V
1
2
C
C6
1uF
100V
CAP3
1
E8
B1100
PVIN
C5
2.2uF
25V
(Opt)
1
GND
B
DESCRIPTION
E1
D
VIN
5V
DATE
1st Prototype
1
*
APPROVED
0
DATE:
IC NO.
REV.
LT3492EFE
DEMO CIRCUIT 1405A
Wednesday, January 13, 2010
1
SHEET
1
1
OF
1
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