LTC4002 datasheet(1/24 Pages) LINER

Part #	LTC4002

Description	PWM LED Driver and Boost, Flyback and SEPIC Controller

PDF	24 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3783

3783f

■

High Voltage LED Arrays

■ Telecom Power Supplies

■ 42V Automotive Systems

■ 24V Industrial Controls

■ IP Phone Power Supplies

PWM LED Driver and Boost,

Flyback and SEPIC Controller

■ True Color PWM

TM Delivers Constant Color with

3000:1 Dimming Ratio

■ Fully Integrated Load FET Driver for PWM Dimming

Control of High Power LEDs

■ 100:1 Dimming from Analog Inputs

■ Wide FB Voltage Range: 0V to 1.23V

■ Constant Current or Constant Voltage Regulation

■ Low Shutdown Current: IQ = 20µA

■ 1% 1.23V Internal Voltage Reference

■ 2% RUN Pin Threshold with 100mV Hysteresis

■ Programmable Operating Frequency (20kHz to

1MHz) with One External Resistor

■ Synchronizable to an External Clock Up to 1.3fOSC

■ Internal 7V Low Dropout Voltage Regulator

■ Programmable Output Overvoltage Protection

■ Programmable Soft-Start

■ Can be Used in a No RSENSE

TM Mode for VDS < 36V

■ 16-Lead DFN and TSSOP Packages

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

The LTC

®3783 is a current mode LED driver and boost,

flyback and SEPIC controller that drives both an N-channel

power MOSFET and an N-channel load PWM switch.

When using an external load switch, the PWMIN input not

only drives PWMOUT, but also enables controller GATE

switching and error amplifier operation, allowing the con-

troller to store load current information while PWMIN is

low. This feature (patent pending) provides extremely fast,

true PWM load switching with no transient overvoltage or

undervoltage issues; LED dimming ratios of 3000:1 can be

achieved digitally, avoiding the color shift normally asso-

ciated with LED current dimming. The FBP pin allows

analog dimming of load current, further increasing the

effective dimming ratio by 100:1 over PWM alone.

In applications where output load current must be re-

turned to VIN, optional constant current/constant voltage

regulation controls either output (or input) current or

output voltage and provides a limit for the other. ILIM

provides a 10:1 analog dimming ratio.

For low- to medium-power applications, No RSENSE mode

can utilize the power MOSFET’s on-resistance to eliminate

the current-sense resistor, thereby maximizing efficiency.

The IC’s operating frequency can be set with an external

resistor over a 20kHz to 1MHz range and can be synchro-

nized to an external clock using the SYNC pin.

The LTC3783 is available in the 16-lead DFN and TSSOP

packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

True Color PWM and No RSENSE are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Patent pending.

350mA PWM LED Boost Application

LTC3783

1M

RUN

PWMIN

ITH

SS

VREF

FBP

FBN

FREQ

SYNC

VIN

OV/FB

PWMOUT

ILIM

GATE

SENSE

INTVCC

GND

LED*

STRING

VIN

6V TO 16V

(< TOTAL VF OF LEDs)

GND

M1

M1, M2: SILICONIX Si4470EY

10

µF

×2

ZETEX ZLL51000

M2

COUT

10

µF

VOUT

<25V

*LUMILEDS LHXL-BW02

3783 TA01a

0.1

µF

10k

6k

105k

10

µF

2.2

µH

4.7

µF

0.05

Ω

237k

12.4k

0.3

Ω

Typical Waveforms

VPWMIN

5V/DIV

IL

2.5A/DIV

ILED

0.5A/DIV

VOUT

0.2V/DIV

AC COUPLED

1

µs/DIV

3783 TA01b

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