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LT3478 Datasheet(PDF) 19 Page - Linear Technology

Part # LT3478
Description  4.5A Monolithic LED Drivers with True Color PWM Dimming
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3478 Datasheet(HTML) 19 Page - Linear Technology

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LT3478/LT3478-1
19
34781f
TYPICAL APPLICATIO S
15W, 6 LEDs at 700mA, Boost LED Driver
LT3478-1
SHDN
VREF
OUT
LED
CTRL2
OVPSET
CTRL1
PWM
SS
VC
RT
VIN
VS
LSW
C2
10
µF
25V
R1
45.3k
R4
54.9k
RT
69.8k
fOSC = 500kHz
100Hz
R2
130k
PWM
DIMMING RATIO = 1000:1
L1: CDRH104R-100NC
D1: PDS560
Q1: Si2318DS
LEDs: LUXEON III (WHITE)
700mA
D1
3478 TA02a
L1
10
µH
3.3V
0V
VIN
8V TO 16V
C1
4.7
µF
25V
CC
0.1
µF
CSS
1
µF
R3
10k
Q1
PWM DIMMING RATIO = 1000:1
(SEE EFFICIENCY ON PAGE 1)
PWM
5V/DIV
INDUCTOR
CURRENT
1A/DIV
ILED
0.5A/DIV
3478 TA02b
2
µs/DIV
fPWM = 100Hz
LT3478-1 PWM Dimming
Waveforms
APPLICATIO S I FOR ATIO
3252 F08
OUTPUT CAPACITOR
CVS
VS
CVIN
VIN
INDUCTOR
1
2
3
4
5
6
7
8
LT3478/LT3478-1
16
15
14
13
12
11
10
9
EXPOSED PAD
PIN 17
POWER GND
ANALOG GND
VIN BYPASS CAP
VOUT
GND
(CONNECT MULTIPLE GROUND PLANES
THROUGH VIAS UNDERNEATH THE IC)
SOLDER THE EXPOSED PAD (PIN 17)
TO THE ENTIRE COPPER GROUND PLANE
UNDERNEATH THE DEVICE
SW
SW
VIN
VS
L
VOUT
LED
OVPSET
L
SW
SS
RT
PWM
CTRL2
CTRL1
SHDN
VREF
VC
CSS
CC
RT
R
RC
CF
C
RSENSE
(LT3478 ONLY)
R
SCHOTTKY
DIODE
R
R
R
R
Figure 12. Recommended Layout for LT3478/LT3478-1 (Boost Configuration)



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