LT3477EUF#TRPBF Linear Technology, LT3477EUF#TRPBF Datasheet - Page 16

• Manufacturer Part Number: LT3477EUF#TRPBF
• Description: IC LED DRVR HP CONST CURR 20-QFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3477EUF#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: Flyback, PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: White LED
• Frequency: 200kHz ~ 3.5MHz
• Voltage - Supply: 2.5 V ~ 25 V
• Mounting Type: Surface Mount
• Package / Case: 20-QFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 3A
• Internal Switch(s): Yes
• Efficiency: 93%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

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