LT3755 LINER [Linear Technology], LT3755 Datasheet - Page 18

• Manufacturer Part Number: LT3755
• Description: 40VIN, 75VOUT LED Controller
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIONS
LT3755/LT3755-1
18
V
500mA/DIV
OUT
0V TO 5V
10V/DIV
2A/DIV
= 50V
PWM
I
LED
I
L1
Waveforms for 50W LED Driver with
V
IN
= 12V
PWM Disconnect NFET
50μs/DIV
8V TO
L1: COILTRONICS DR127-220
M1: VISHAY SILICONIX SI7850DP
D1: DIODES INC. PDS5100
M2: VISHAY SILICONIX SI2308DS
RT1: MURATA NCP18WM1045
D2: IN4448HWT
40V
V
IN
D2
C1
4.7μF
INTV
37551 TA02b
CC
100k
187k
10k
1M
0.01μF
16.9k
28.7k
400kHz
100k
NTC
RT1
100
50W White LED Headlamp Driver
84
80
96
92
88
0.0
SHDN/UVLO
V
CTRL
OPENLED
PWM
SS
RT
V
V
REF
C
IN
10k
0.001μF
= 12V
0.2
LT3755
Effi ciency vs Load
V
GND
IN
PWMOUT
INTV
SENSE
0.4
LOAD (A)
GATE
22μH
ISN
ISP
FB
L1
CC
4.7μF
0.6
M1
0.015Ω
0.8
D1
0.1Ω
37551 TA02c
1.0
1A
120
100
M2
1M
23.7k
37551 TA02a
80
60
40
20
0
25
50W
LED
STRING
V
for NTC Resistor Divider
ISP
C2
4.7μF
45
-V
TEMPERATURE (°C)
ISN
65
vs Temperature
85
105
37551 TA02d
37551fa
125