Datasheet

LT3477
16
3477fc
TYPICAL APPLICATIONS
87% Effi cient, 4W LED Driver
I
SN1
I
SP1
V
IN
I
ADJ1
I
ADJ2
FBN
I
SP2
R2
200k
C2
3.3μF
C1
3.3μF
V
IN
5V
C3
33nF
C1: TAIYO YUDEN LMK316BJ335ML
C2: TAIYO YUDEN TMK325BJ335MN
D1: DIODES INC. DFLS120L
L1: TOKO A915AY-100M
330mA
LED1
LED2
LED3
LED4
3477 TA03a
R1
10k
R3
22k
R6
0.3Ω
SW
L2
10μH
R4
0.05Ω
D1
FBP SSGND
LT3477
I
SN2
R
T
SHDN
V
C
V
REF
SHDN
C
C
4.7nF
R
C
1k
Effi ciency
1A Buck Mode High Current LED Driver
Effi ciency
I
OUT
(A)
0
EFFICIENCY (%)
70
75
80
0.4
3477 TA01b
65
60
50
0.1
0.2
0.3
55
90
85
I
SN1
I
SP1
V
IN
I
ADJ1
I
ADJ2
FBN
I
SP2
R3
280k
R4
10k
C1
2.2μF
R1
0.1Ω
C3
3.3μF
PV
IN
32V
V
IN
3.3V
C4
33nF
C1: NIPPON UNITED CHEMICON NTS40X5R1H225M
C2: TAIYO YUDEN GMK316BJ105ML
C3: TAIYO YUDEN LMK316BJ475
L1: TOKO A814AY-330M
D1: DIODES INC DFLS140
3477 TA05a
R2
22k
SW
L1
33μH
1A
LED
STRING
C2
1μF
D1
LED4
LED1
•
•
•
FBP SSGND
LT3477
I
SN2
R
T
SHDN
V
C
V
REF
SHDN
C
C
4.7nF
R
C
1k
LED CURRENT (A)
0
EFFICIENCY (%)
50
60
70
0.6
1
3477 TA05b
40
30
20
0.2 0.4 0.8
80
90
100