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LT3755IMSE-1-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LT3755IMSE-1-PBF
Description  40VIN, 75VOUT LED Controller
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3755IMSE-1-PBF Datasheet(HTML) 1 Page - Linear Technology

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LT3755/LT3755-1
1
37551fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
40VIN, 75VOUT LED Controller
The LT
®3755 and LT3755-1 are DC/DC controllers designed
to operate as a constant-current source for driving high
current LEDs. They drive a low side external N-channel
power MOSFET from an internal regulated 7V supply. The
fixed frequency, current-mode architecture results in stable
operation over a wide range of supply and output voltages.
A ground referenced voltage FB pin serves as the input for
several LED protection features, and also makes it possible
for the converter to operate as a constant-voltage source.
A frequency adjust pin allows the user to program the
frequency from 100kHz to 1MHz to optimize efficiency,
performance or external component size.
The LT3755/LT3755-1 sense output current at the high
side of the LED string. High side current sensing is the
most flexible scheme for driving LEDs, allowing boost,
buck mode or buck-boost mode configuration. The PWM
input provides LED dimming ratios of up to 3000:1, and the
CTRL input provides additional analog dimming capability.
Both parts are available in the 16-lead (3mm
× 3mm) QFN
and MSOP packages.
50W White Automotive LED Headlamp Driver
n 3000:1 True Color PWM
TM Dimming
n Wide Input Voltage Range: 4.5V to 40V
n Output Voltage Up to 75V
n Constant-Current and Constant-Voltage Regulation
n 100mV High Side Current Sense
n Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
n Adjustable Frequency: 100kHz to 1MHz
n Open LED Protection
n Programmable Undervoltage Lockout with Hysteresis
n Open LED Status Pin (LT3755)
n Frequency Synchronization (LT3755-1)
n PWM Disconnect Switch Driver
n CTRL Pin Provides Analog Dimming
n Low Shutdown Current: <1μA
n Programmable Soft-Start
n Thermally Enhanced 16-Lead QFN (3mm
× 3mm)
and MSOP Packages
n High Power LED Applications
n Industrial
n Automotive
VIN
LT3755
22μH
GND
VC
INTVCC
SHDN/UVLO
FB
VREF
ISP
332k
100k
INTVCC
1M
4.7μF
0.001μF
0.01μF
VIN
8V TO
40V
185k
10k
28.7k
400kHz
4.7μF
40.2k
CTRL
0.015Ω
0.1Ω
1M
23.7k
1A
4.7μF
50W
LED
STRING
37551 TA01a
OPENLED
PWM
SS
RT
ISN
GATE
SENSE
PWMOUT
10k
D2
Efficiency vs VIN
VIN (V)
010
80
84
88
92
96
100
20
30
40
37551 TA01b
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners. Protected by U.S. Patents including 7199560.


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