LT3476 Просмотр технического описания (PDF) - Linear Technology
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Компоненты Описание
производитель
LT3476 Datasheet PDF : 14 Pages
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Typical Applications
Buck Mode 100W Quad 1A × 8 LED Driver
PVIN
33V
CAP1
100mΩ
LED1
CAP2
100mΩ
LED2
CAP3
100mΩ
LED3
CAP4
100mΩ
LED4
UP TO
8 LEDS
1A
0.22µF
1A
0.22µF
1A
0.22µF
1A
0.22µF
2.2µF
×4
L1
10µH D1
L2
D2
10µH
L3
10µH D3
L4
D4
10µH
VIN
2.8V TO 16V
PWM1-4
SHDN
2.2µF
SW1
CAP1-4
LED1-4
VIN
PWM1-4
SHDN
SW2
SW3
LT3476
GND
SW4
REF
VADJ1-4
VC1-4
RT
3476 TA05
1.05V
4.99k
100k
21k
1nF
L1 TO L4: TOKO A916CY-100M
D1 TO D4: DIODES, INC. DFLS140
LT3476
Efficiency vs LED Current for Buck Mode
100
96
7 LEDS
92
5 LEDS
88
84
VIN = 3.3V
PVIN = 33V
WHITE LEDS
VF = 3.6V AT 1A
80
0
0.2 0.4 0.6 0.8 1.0
LED CURRENT (A)
3476 TA05b
5V to 25V Buck-Boost Mode Driver for 2 Series 350mA LEDs
PVIN
5V TO 25V
350mA
350mA
350mA
350mA
LED1
300mΩ
L1
10µH
LED2
300mΩ
L2
L3
10µH 10µH
LED3
300mΩ
L4
10µH
Buck-Boost Mode Efficiency vs LED Current
90
85
80
LED4
300mΩ
75
PVIN = 10V
PVIN = 5V
CAP1
D1
2.2µF
CAP2
D2
2.2µF
D3
2.2µF
CAP3
D4
2.2µF
CAP4
VIN
3.3V
PWM1-4
SHDN
2.2µF
SW1
CAP1-4
LED1-4
VIN
PWM1-4
SHDN
SW2 SW3
LT3476
GND
SW4
REF
VADJ1-4
VC1-4
RT
3476 TA03
1.05V
4.99k
44.2k
600kHz
2.2nF
70
65
60
50
VIN = 3.3V
2 WHITE LEDS
VF = 3.6V AT 1A
100 150 200 250 300 350
LED CURRENT (mA)
3476 TA03b
L1 TO L4: COOPER COILTRONICS MPI4040R3-100R
D1 TO D4: NXP PMEG4010
3476fb
11
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