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LT3478IFE-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3478/LT3478-1
19
34781f
TYPICAL APPLICATIO S
U
15W, 6 LEDs at 700mA, Boost LED Driver
LT3478-1
SHDN
V
REF
OUT
LED
CTRL2
OVPSET
CTRL1
PWM SS V
C
R
T
V
IN
V
S
LSW
C2
10µF
25V
R1
45.3k
R4
54.9k
R
T
69.8k
f
OSC
= 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
10µH
3.3V
0V
V
IN
8V TO 16V
C1
4.7µF
25V
C
C
0.1µF
C
SS
1µF
R3
10k
Q1
PWM DIMMING RATIO = 1000:1
(SEE EFFICIENCY ON PAGE 1)
PWM
5V/DIV
INDUCTOR
CURRENT
1A/DIV
I
LED
0.5A/DIV
3478 TA02b
2µs/DIV
f
PWM
= 100Hz
LT3478-1 PWM Dimming
Waveforms
APPLICATIO S I FOR ATIO
WUU
U
3252 F08
OUTPUT CAPACITOR
C
VS
V
S
C
VIN
V
IN
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
V
IN
BYPASS CAP
V
OUT
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
V
IN
V
S
L
V
OUT
LED
OVPSET
L
SW
SS
R
T
PWM
CTRL2
CTRL1
SHDN
V
REF
V
C
C
SS
C
C
R
T
R
R
C
C
F
C
R
SENSE
(LT3478 ONLY)
R
SCHOTTKY
DIODE
R
R
R
R
Figure 12. Recommended Layout for LT3478/LT3478-1 (Boost Confi guration)
LT3478/LT3478-1
20
34781f
TYPICAL APPLICATIO S
U
16W, 12 LEDs at 350mA, Buck-Boost Mode LED Driver plus LT3003
LT3478-1
SHDN
V
REF
OUT
LED
CTRL2
CTRL1
OVPSET
PWM SS V
C
R
T
V
IN
V
S
LSW
C2
10µF
50V
C3
3.3µF
10V
R1
24k
R
T
69.8k
f
OSC
= 500kHz
100Hz
R2
100k
PWM
DIMMING RATIO = 200:1
L1: CDRH105R-8R2
D1: PDS560
D2: 7.5V ZENER
LEDs: LUXEON I (WHITE)
1.05A
D1
3478 TA04a
L1
8.2µH
V
IN
5V
3.3V
0V
V
S
12V TO 16V
C1
4.7µF
25V
V
C
V
C
V
OUT
V
OUT
C
C
0.1µF
C
SS
1µF
C4
1µF
LT3003
V
MAX
OT1
OT2
V
IN
PWM
GND V
EE
LED1 LED2 LED3
D2
V
S
(V)
EFFICIENCY (%)
90
85
80
75
70
50
55
60
65
3478 TA04b
12 LEDs
(4 SERIES x 3 CHANNELS)
LUXEON I (WHITE)
12 14 161513
V
IN
= 5V
I
LED
= 350mA
f
OSC
= 500kHz
PWM DUTY CYCLE = 100%
Effi ciency vs Input V
S
LT3478-1
SHDN
V
REF
OUT
LED
CTRL2
CTRL1
OVPSET
PWM SS V
C
R
T
V
IN
V
S
LSW
C2
3.3µF
25V
C3
3.3µF
10V
R1
24k
R
T
31.6k
f
OSC
= 1MHz
100Hz
R2
100k
PWM
DIMMING RATIO = 3000:1
L1: CDRH104R-5R2
D1: PDS560
LEDs: LUXEON I (WHITE)
1.05A
D1
3478 TA03a
L1
5.2µH
V
IN
3.3V
3.3V
0V
V
S
8V TO 14V
C1
4.7µF
16V
V
C
V
C
V
IN
V
OUT
V
OUT
C
C
0.1µF
C
SS
1µF
LT3003
V
MAX
OT1
OT2
V
IN
PWM
GND V
EE
LED1 LED2 LED3
V
S
(V)
8
EFFICIENCY (%)
90
85
80
75
70
3478 TA03b
10 1412
V
IN
= 3.3V
I
LED
= 350mA
f
OSC
= 1MHz
PWM DUTY CYCLE = 100%
15 LEDs
(5 SERIES x 3 CHANNELS)
LUXEON I (WHITE)
17W, 15 LEDs at 350mA, Boost LED Driver plus LT3003
Effi ciency vs Input V
S
LT3478/LT3478-1
21
34781f
TYPICAL APPLICATIO S
U
LT3478-1
SHDN
V
REF
OUT
LED
CTRL2
CTRL1
OVPSET
PWM SS V
C
R
T
V
IN
V
S
LSW
C2
4.7µF
16V
R1
100k
R4
510Ω
R5
510Ω
R
T
69.8k
f
OSC
= 500kHz
1kHz
R2
34k
PWM
DIMMING RATIO = 200:1
L1: CDRH105R-6R8
D1: B320
Q1: Si2302ADS
Q2: Si2315BDS
LED: LUXEON III (WHITE)
1A
Q1
Q2
D1
3478 TA06a
L1
6.8µH
3.3V
0V
V
IN
3.8V TO 6.5V
NiMH 4×
C1
10µF
10V
C
C
0.1µF
C
SS
1µF
R3
10k
OFFON
35764
V
IN
(V)
EFFICIENCY (%)
80
75
70
50
55
60
65
3478 TA06b
SINGLE LED
LUXEON III (WHITE)
I
LED
= 1A
f
OSC
= 500kHz
PWM DUTY CYCLE = 100%
4W, 1 LED at 1A, Buck-Boost Mode LED Driver
Effi ciency vs V
IN
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3478IFE-1#TRPBF

Mfr. #:
Buy LT3478IFE-1#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 4.5A 42V, 2.25MHz Boost LED Driver w/ True Color PWM Dimming
Lifecycle:
New from this manufacturer.
Delivery:
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