LT3756-1 LINER [Linear Technology], LT3756-1 Datasheet

LT3756-1

Manufacturer Part Number

LT3756-1

Description

60VIN LED Controller with Internal PWM Generator

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT3756-1.pdf (28 pages)

Current page: 1 of 28
Download datasheet (394Kb)

FeaTures

applicaTions

Typical applicaTion

8V TO

60V

3000:1 True Color PWM™ Dimming for LEDs

Wide V

Rail-to-Rail Current Sense Range: 0V to 80V

Programmable PWM Dimming Signal Generator

Constant Current (±3%) and Constant-Voltage

(±2%) Regulation

Analog Dimming

Drives LEDs in Boost, SEPIC, Inverting, Buck Mode,

Buck-Boost Mode, or Flyback Configuration

Output Short-Circuit Protected Boost

Open LED Protection and Reporting

Adjustable Switching Frequency: 100kHz to 1MHz

Programmable V

C/10 Indication for Battery Chargers

Low Shutdown Current: <1µA

Thermally Enhanced 16-Lead MSOP Package

High Voltage LED Strings >100V with Ground

Referred Current Sense

Grounded Anode LEDs

Battery and SuperCap Chargers

Accurate Current Limited Voltage Regulators

DIM

0.01µF

124k

2.2µF

×2

INTV

300Hz

100k

499k

90.9k

Range: 4.5V to 60V

47nF

94% Efficient Boost LED Driver for Automotive

Headlamp with 25:1 Internal PWM Dimming

140k

EN/UVLO

CTRL

OPENLED

DIM/SS

PWM

UVLO with Hysteresis

REF

5.1k

4.7nF

LT3761

PWMOUT

28.7k

350kHz

INTV

SENSE

GATE

GND

10µH

ISP

ISN

1µF

INTV

10m

2.2µF

×4

16.9k

0.25

DescripTion

The LT

a constant-current source and constant-voltage regulator.

It features a programmable internal PWM dimming signal.

The LT3761 is ideally suited for driving high current LEDs,

but also has features to make it suitable for charging bat-

teries and supercapacitors. The fixed frequency, current

mode architecture results in stable operation over a wide

range of supply and output voltages. A voltage feedback

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 LT3761 senses output current at the high side or at the

low side of the load. The PWM input can be configured to

self-oscillate at fixed frequency with duty ratio program-

mable from 4% to 96%. When driven by an external

signal, the PWM input provides LED dimming ratios of

up to 3000:1. The CTRL input provides additional analog

dimming capability.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

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, 7321203.

60V

3761 TA01a

Internal PWM Generator

60W

LED

STRING

3761 is a DC/DC controller designed to operate as

1A/DIV

LED

LED Controller with

PWM Dimming Waveforms at

Various DIM Voltage Settings

0.5ms/DIV

LT3761

3761 TA01b

DIM

PWM

= 7.7V

= 4V

= 1.5V

= 0.4V

= 96%

= 50%

= 10%

= 4.3%

3761f

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