5
dc1470af
DEMO MANUAL DC1470A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
6V - 36V
(400kHz)
HIGH CURRENT SYNCHRONOUS
* See Quick Start Guide
*
*
*
VIN
VCC_INT
VIN
VCC_INT
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
WALKER B.
PRODUCTION
13
10-02-09
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
WALKER B.
PRODUCTION
13
10-02-09
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
WALKER B.
PRODUCTION
13
10-02-09
SIZE
DATE:
IC NO.
REV
SHEET
OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
SCHEMATIC
3
Friday, July 31, 2015
11
STEP-DOWN LED DRIVER WITH THREE-STATE CONTROL
ANTONINA K.
WALKER B.
A
LT3743EUFD
DEMO CIRCUIT 1470A
SIZE
DATE:
IC NO.
REV
SHEET
OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
SCHEMATIC
3
Friday, July 31, 2015
11
STEP-DOWN LED DRIVER WITH THREE-STATE CONTROL
ANTONINA K.
WALKER B.
A
LT3743EUFD
DEMO CIRCUIT 1470A
SIZE
DATE:
IC NO.
REV
SHEET
OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
SCHEMATIC
3
Friday, July 31, 2015
11
STEP-DOWN LED DRIVER WITH THREE-STATE CONTROL
ANTONINA K.
WALKER B.
A
LT3743EUFD
DEMO CIRCUIT 1470A
E5
CTRL_L
E12
GND
C26
1.2nF
+
C18 470uF
R6 10k
+
C25 470uF
C1
4.7uF
R19 432K
R23
3.01K
R15
10
R5 51K
R2 374K
Q2
BSC080N03LS G
3
2
1
4
5
6
7
8
C8 1uF
+
C14 OPT
Q3
BSC011N03LSI
3
2
1
4
5
6
7
8
R17
0
R7 51K
R1 124K
R27 0
E7
CTRL_SEL
Q5
Si7234DP
3
4
1
2
7
8
6
5
E1
VIN
R21 OPT
U1
LT3743EUFD
EN/UVLO
2
VREF
3
CTRL_T
4
CTRL_H
6
CTRL_L
7
SS
8
GND
21
FB
10
SENSE+
11
SENSE-
12
VCL
13
VCH
14
RT
15
SYNC
16
CTRL_SEL
17
PWM
18
PWMGH
19
PWMGL
22
HG
23
SW
24
CBO
OT
25
LG
26
VCC_INT
27
VIN
28
GND
29
GND
5
GND
20
GND
1
GND
9
D1
PMEG4002EB
1
2
+
C23
470uF
C15
33nF
E13
IS+
R26
OPT
R20 100K
R16
10
C16
4.7uF
E11
LED-
+
C21 470uF
E8
SYNC
R3
0.0025
D2
DFLS240
OPT
R10
100K
L1
1.3uH
C27 10uF
R22 OPT
R11 OPT
E14
IS-
R13 100K
R4
100K
+
C11 100uf,50V 50CE100LX
R9
100K
R24 2K
R8 51K
Q1
3
2
1
4
5
6
7
8
E4
CTRL_H
+
C24 OPT
+
C19 OPT
+
C13 OPT
C17
E9
PVIN
6V - 36V
R25
OPT
C9 5.6nF
+
C22 OPT
C4 22uF 6.3V
+
C6 470uF
C7 2nF
R18
24.9K
E6
PWM
Q6
Si7234DP
3
4
1
2
7
8
6
5
E2
EN/UVLO
R12 100K
C12
+
C20 OPT
E10
VOUT
*
Q4 OPT
3
2
1
4
5
6
7
8
R14 100K
C2 1uF 50V
C3
0.22uF
E3
GND
+
C5 470uF
C10 5.6nF
