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LT3477 Datasheet(PDF) 12 Page - Linear Technology

Part # LT3477
Description  3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3477 Datasheet(HTML) 12 Page - Linear Technology

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LT3477
12
3477fc
APPLICATIONS INFORMATION
Figure 7c. Efficiency and LED Current
vs PWM Duty Cycle
Figure 7b. PWM Dimming Waveforms
10μs/DIV
ILED
200mA/DIV
IL
1A/DIV
PWM
5V/DIV
3477 F07b
VIN = 5V
4 LEDs
300mA
PWM FREQ = 100Hz
BOOST
PWM DUTY CYCLE (%)
0
75
80
85
80
3477 F07c
70
65
20
40
60
100
60
55
50
250
300
350
200
150
100
50
0
VIN = 5V
BOOST
4 LEDs, 300mA
PWM FREQUENCY = 100Hz
EFFICIENCY
LED CURRENT
ISN1
ISP1
VIN
IADJ2
IADJ1
FBN
ISP2
FBP
VREF
1M
C2
10μF
C1
3.3μF
VIN
5V
C1: TAIYO YUDEN EMK316BJ335ML
C2: TAIYO YUDEN UDK325BJ106MM
L1: TOKO D53LC (PN# A915AY-2ROM)
D1: ZETEX ZLLS1000
D2: DIODES INC 1N4148
NMOS1: ZETEX 2N7002
NMOS2: FAIRCHILD FDG327N
LED1 TO LED4: LUMILEDS LXHL-BW02
CC
10nF
CSS
33nF
300mA
LED1
LED2
LED3
LED4
3477 F07a
75k
6.81k
NMOS1
NMOS2
OUT
100k
0
5V
100Hz
PWM
RC
2.4k
RSENSE
0.33Ω
SW
L1
2.0μH
D1
D2
SS
GND
LT3477
ISN2
RT
SHDN
VC
Figure 7a. 5V to 4 White LEDs: Boost With PWM Dimming



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