LT3755IUD-1#TRPBF Linear Technology, LT3755IUD-1#TRPBF Datasheet - Page 22

• Manufacturer Part Number: LT3755IUD-1#TRPBF
• Description: IC LED DRVR HP CONST CURR 16-QFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3755IUD-1#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: Flyback, Low Side, PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Automotive
• Type - Secondary: White LED
• Frequency: 100kHz ~ 1MHz
• Voltage - Supply: 4.5 V ~ 40 V
• Voltage - Output: 75V
• Mounting Type: Surface Mount
• Package / Case: 16-WQFN Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

Typical applicaTions
LT3755/LT3755-1/LT3755-2

Buck-Boost Mode Efficiency 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
40
CC
V
0.01µF
IN
LT3755-2
GATE
V
15µH
C
L1
4.7k
4700pF
SENSE
GND
PWMOUT
PWM
ISP
ISN
RT
FB
M1
0.02
28.7k
375kHz
D1
392k
Q1
Buck-Boost Mode LED Current vs Low 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
11
Q2
1k
21.5V
12
1A
13
0.1
14
37551 TA07a
37551 TA07c
15
16
37551fd