lt3475efe-trpbf Linear Technology Corporation, lt3475efe-trpbf Datasheet - Page 20

• Manufacturer Part Number: lt3475efe-trpbf
• Description: Dual Step-down 1.5a Led Driver
• Manufacturer: Linear Technology Corporation

RELATED PARTS
LT3475/LT3475-1
PART NUMBER
LT1618
LT3466
LT3474
LT3477
LT3479
LT3846
20
TYPICAL APPLICATION
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
DESCRIPTION
Constant-Current, 1.4MHz, 1.5A Boost
Converter
Dual Full Function Step-Up LED Driver
36V, 1A (I
LED Driver
42V, 3A, 3.5MHz Boost, Buck-Boost,
Buck LED Driver
3A, Full-Featured DC/DC Converter with
Soft-Start and Inrush Current Protection
Dual 1.3A, 2MHz, LED Driver
D7
Q1
●
2.2μF
R6
100k
R4
10k
25V
D1, D4: 7.5V ZENER DIODE
D2, D3: MMSD4148
D5, D6: B240A
D7, D8: 22V ZENER DIODE
R1, R2: USE 0.5W RESISTOR OF TWO 2k 0.25W RESISTORS IN PARALLEL
Q1, Q2: MMBT3904
C1 TO C5: X5R or X7R
*DERATE LED CURRENT AT ELEVATED AMBIENT TEMPERATURES TO MAINTAIN LT3475-1 JUNCTION TEMPERATURE BELOW 125 °C.
FAX: [phone]
C4
LED
), 2MHz Step-Down
Dual Step-Down 1.5A LED Driver with Four Series Connected LED Output
21V TO 36V
D1
12V TO 18V LED VOLTAGE
CURRENT*
33μH
R1
1k
1.5A LED
L1
V
0.1μF
IN
D2
C6
●
www.linear.com
0.22μF
16V
C2
C1
4.7μF
50V
D5
COMMENTS
V
MS10 Package
Drivers Up to 20 LEDs, V
V
TSSOP16E Package
V
QFN, TSSOP20E Packages
V
DFN, TSSOP Packages
V
DFN, TSSOP16E Packages
IN(MIN)
IN(MIN)
IN(MIN)
IN(MIN)
IN
BOOST1
SW1
OUT1
LED1
V
REF
V
C1
ADJ1
: 2.5V to 24V, V
V
IN
= 1.6V, V
= 4V, V
= 2.5V, V
= 2.5V, V
LT3475-1
GND
IN(MAX)
SHDN
IN(MAX)
IN(MAX)
IN(MAX)
BOOST2
OUT(MAX)
V
OUT2
LED2
SW2
ADJ2
V
R
= 36V, 400:1 True Color PWM, I
C2
T
= 18V, V
IN
= 25V, V
= 24V, V
: 2.7V to 24V, V
f
SW
= 36V, 1000:1 True Color PWM
12V TO 18V LED VOLTAGE
= 600kHz
R3
24.3k
OUT(MAX)
OUT(MAX)
OUT(MAX)
C3
0.22μF
16V
D6
OUT(MAX)
= 35V, Analog/PWM, I
= 40V, Analog/PWM, I
= 40V, Analog/PWM, I
CURRENT*
1.5A LED
C7
0.1μF
D3
33μH
R2
L2
1k
= 40V, DFN, TSSOP16E Packages
© LINEAR TECHNOLOGY CORPORATION 2006
D4
SD
< 1μA,
TM
Dimmin,
LT 1007 REV B • PRINTED IN USA
SD
SD
SD
C5
2.2μF
25V
100k
R7
< 1μA,
< 1μA,
< 1μA,
R5
10k
D8
Q2
3475 TA08
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