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LT3474 Datasheet(PDF) 23 Page - Analog Devices

Part # LT3474
Description  40VIN, 75VOUT LED Controllers
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3474 Datasheet(HTML) 23 Page - Analog Devices

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LT3755/LT3755-1/LT3755-2
23
Rev. E
For more information www.analog.com
TYPICAL APPLICATIONS
Buck Mode 500mA LED Driver for 20kHz PWM Dimming
VIN
LT3755
L1
10µH
GND
100k
SHDN/UVLO
VREF
ISP
1M
100k
510k
0.1µF
VIN
10V TO
36V
INTVCC
0.068
267k
28.7k
400kHz
10k
INTVCC
4.7µF
CTRL
0.033
1k
249k
M1
Q2
22.1k
VC
15k
2200pF
D1
37551 TA06a
OPENLED
PWM
SS
RT
ISN
PWMOUT
SENSE
FB
GATE
Q1
1.5A
8.5V MAX
16V
22µF
VIN
LT3755-2
L1
3.3µH
GND
VC
FB
SHDN/UVLO
VREF
ISP
1M
1M
6V
0.1µF
VIN
22V TO
36V
470pF
2200pF
0.2
L1: TOKO 962BS_3R3M
M1: VISHAY SILICONIX SI7850DP
M2: VISHAY SILICONIX SI2306DS
D1: DIODES, INC SBM540
68.1k
CTRL
0.033
M1
M2
22k
D1
37551 TA03a
INTVCC
PWM
SS
ISN
PWMOUT
SENSE
RT
GATE
500mA
16V
2.2µF 2
×
50V
4.7µF 2
×
25V
0.22µF
OPENLED
13k
800kHz
4.7µF
Efficiency vs VIN
PWM
ILED
500mA/DIV
GATE
INDUCTOR
CURRENT
1A/DIV
500ns/DIV
37551 TA06b
Minimum PWM Pulse Switching Waveform
37551 TA06c
VIN (V)
15
25
30
20
35
40
80
92
88
84
100
96
VLED = 16V
ILED = 0.5A



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