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LT3956
TYPICAL APPLICATION
Buck Mode 1A LED Driver with High Dimming Ratio and Open LED Reporting
Efficiency vs V IN
V IN
24V TO
80V
1M
61.9k
EN/UVLO
V IN
ISP
ISN
FB
750
0.1
1A
Q2
200k
200k
200k
C2
4.7μF
5
100
96
92
V REF
M1
20k
INTV CC
30.1k
10k
CTRL
PWMOUT
LT3956
Q1
1k
6 WHITE LEDs
20W
88
84
V IN
100k
0.1μF
28.7k
375kHz
47k
2.2nF
VMODE SW
PWM
SS
RT
V C GND INTV CC PGND
INTV CC
4.7μF
3956 TA07a
L1
33μH
D1
C1
1μF
2
D1: DIODES INC B1100/B
L1: WüRTH 74456133
M1: VISHAY SILICONIX Si5435BDC
Q1: ZETEX FMMT493
Q2: ZETEX FMMT593
C1: TDKC3226X7R2A105K
C2: TDKC3225X7RIE475K
80
20
30
40
50
V IN (V)
60
70 80
3956 TA06b
RELATED PARTS
PART NUMBER
LT3756/LT3756-1/
LT3756-2
LT3755/LT3755-1/
LT3755-2
LT3474
LT3475
DESCRIPTION
100V IN , 100V OUT , Full Featured LED Controller
40V IN , 75V OUT , Full Featured LED Controller
36V, 1A (I LED ), 2MHz, Step-Down LED Driver
Dual 1.5A (I LED ), 36V, 2MHz Step-Down LED Driver
COMMENTS
V IN : 6V to 100V, V OUT(MAX) = 100V, True Color PWM Dimming = 3000:1,
I SD < 1μA, 3mm × 3mm QFN-16 and MS16E Packages
V IN : 4.5V to 40V, V OUT(MAX) = 60V, True Color PWM Dimming = 3000:1,
I SD < 1μA, 3mm × 3mm QFN-16 and MS16E Packages
V IN : 4V to 36V, V OUT(MAX) = 13.5V, True Color PWM Dimming = 400:1,
I SD < 1μA, TSSOP16E Package
V IN : 4V to 36V, V OUT(MAX) = 13.5V, True Color PWM Dimming = 3000:1,
I SD < 1μA, TSSOP20E Package
LT3476
Quad Output 1.5A, 36V, 2MHz High Current LED Driver V IN : 2.8V to 16V, V OUT(MAX) = 36V, True Color PWM Dimming = 1000:1,
with 1000:1 Dimming I SD < 10μA, 5mm × 7mm QFN Package
LT3477
LT3478/LT3478-1
3A, 42V, 3MHz Boost, Buck-Boost, Buck LED Driver
4.5A, 42V, 2.5MHz High Current LED Driver with
3000:1 Dimming
V IN : 2.5V to 25V, V OUT(MAX) = 40V, Dimming = Analog/PWM, I SD < 1μA,
QFN and TSSOP20E Packages
V IN : 2.8V to 36V, V OUT(MAX) = 42V, True Color PWM Dimming = 3000:1,
I SD < 3μA, TSSOP16E Package
3956f
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX:(408)434-0507    www.linear.com ●
 0 Linear Technology Corporation
LT 0510 ? PRINTED IN USA
? LINEAR TECHNOLOGY CORPORATION 2010
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相关代理商/技术参数
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