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LT3474 датащи(PDF) 21 Page - Analog Devices

номер детали LT3474
подробное описание детали  40VIN, 75VOUT LED Controllers
PDF  28 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

LT3474 датащи(HTML) 21 Page - Analog Devices

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LT3755/LT3755-1/LT3755-2
21
Rev. E
For more information www.analog.com
VIN
LT3755-2
L1
22µH
D1
GND
VC
INTVCC
SHDN/UVLO
FB
VREF
ISP
16.9k
INTVCC
R1
1M
100k
CIN
4.7µF
CC
0.001µF
CSS
0.01µF
VIN
8V TO
40V
R2
187k
RC
10k
RT
28.7k
375kHz
CVCC
4.7µF
SEE SUGGESTED LAYOUT, FIGURE 5
100k
NTC
RT1
CTRL
RSENSE
0.015
RLED
0.1
R3
1M
R4
23.7k
M1
M2
1A
COUT
4.7µF
50W
LED
STRING
37551 TA02a
OPENLED
PWM
SS
RT
ISN
GATE
SENSE
PWMOUT
L1: COILTRONICS DR127-220
M1: VISHAY SILICONIX SI7850DP
D1: DIODES INC. PDS5100
M2: VISHAY SILICONIX SI2308DS
RT1: MURATA NCP18WM1045
50W White LED Headlamp Driver
Efficiency vs Load
LOAD (A)
0.0
80
84
88
92
96
100
0.2
0.4
0.6
0.8
37551 TA02c
1.0
VIN = 12V
Waveforms for 50W LED Driver with
PWM Disconnect NFET
IL1
2A/DIV
ILED
500mA/DIV
50µs/DIV
VOUT = 50V
10V/DIV
PWM
0V TO 5V
37551 TA02b
VIN = 12V
TEMPERATURE (°C)
25
0
40
80
45
65
105
85
120
20
60
100
125
37551 TA02d
V(ISP-ISN) Threshold vs Temperature
for NTC Resistor Divider
TYPICAL APPLICATIONS



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