LT3477 LINER [Linear Technology], LT3477 Datasheet - Page 14

• Manufacturer Part Number: LT3477
• Description: 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LT3477
14
C1: TAIYO YUDEN LMK316BJ335ML
C2: TAIYO YUDEN UDK325BJ106MM
L1: TOKO D53LC (PN# A915AY-4R7M)
D1: ZETEX ZLLS1000
D2: DIODES INC 1N4148
NMOS1, NMOS2: ZETEX 2N7002
PMOS: SILICONIX Si2303BDS
LED1, LED2: LUMILEDS LXHL-BW02
U
5V
0
U
100Hz
Figure 9a. 10V to 2 White LEDs: Buck-Boost Mode with PWM Dimming
500mA/DIV
W
PWM
10V/DIV
1A/DIV
100k
PWM
I
10V
LED
V
I
IN
L
D2
V
2 LEDs
300mA
Figure 9b. PWM Dimming Waveforms
IN
= 10V
U
C1
3.3µF
C
33nF
SS
PWM FREQUENCY = 100Hz
BUCK-BOOST MODE
NMOS1
R
1.5k
C
C
10nF
C
V
I
I
SS
I
SHDN
V
PMOS
SP1
ADJ1
ADJ2
2ms/DIV
IN
C
I
SN1
LT3477
GND
4.7µH
L1
1k
1k
SW
NMOS2
3477 F09b
3477 F09a
V
I
I
FBN
FBP
SP2
SN2
REF
R
D1
T
6.81k
LED2
PWM
1M
49.9k
300mA
LED1
R
0.33Ω
SENSE
C2
10µF
3477fb