LT3755 LINER [Linear Technology], LT3755 Datasheet - Page 21

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

TYPICAL APPLICATIONS
Buck-Boost Mode Effi ciency vs Input Voltage
100
95
90
85
80
0
8V TO
36V
V
5
IN
10
INPUT VOLTAGE (V)
549k
75.0k
15
21W Buck-Boost Mode with 250:1 PWM Dimming and Open LED Protection
20
4.7μF
499k
93.1k
25
100k
30
50V
2.2μF
2
37551 TA07b
35
SHDN/UVLO
V
CTRL
INTV
OPENLED
REF
SS
10k
40
CC
V
0.01μF
IN
GATE
LT3755
V
15μH
C
L1
4.7k
4700pF
SENSE
GND
PWMOUT
PWM
ISP
ISN
RT
FB
0.020k
28.7K
400KHz
D1
392k
Q1
Buck-Boost Mode LED Current vs Input Voltage
20.0k
PWM
1.10
1.05
0.95
0.85
0.9
0.8
M1: VISHAY SILICONIX SI7850DP
M2: VISHAY SILICONIX SI2319DS
Q1: ZETEX FMMT558
Q2: MMBTA42
D1: DIODES INC. PDS560
L1: SUMIDA CDRH127/LD-150
100k
1
8
100V
2.2μF
2
V
9
IN
10
1.5k
INPUT VOLTAGE (V)
M2
LT3755/LT3755-1
11
Q2
1k
21.5V
12
1A
13
0.1k
14
37551 TA07a
37551 TA07c
15
16
21
37551fa