LT3743(RevB) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT3743
(Rev.:RevB)

High Current Synchronous Step-Down LED Driver with Three-State Control

Linear Technology 

LT3743

TYPICAL PERFORMANCE CHARACTERISTICS

Overcurrent Threshold

120

100

80

LED Current Waveforms

(90% PWM) 0.5A to 5A

CTRL_SEL

5V/DIV

SW

20V/DIV

60

ILED

5A/DIV

40

IL

10A/DIV

20

40μs/DIV

0

0

0.75

1.5

2.25

3.0

CTRL_H (V)

3743 G28

LED Current Waveforms

(3000:1) 2A to 20A

LED Current Waveforms

(3000:1) 0A to 2A to 20A

CTRL_SEL

5V/DIV

SW

10V/DIV

CTRL_SEL

5V/DIV

PWM

5V/DIV

SW

10V/DIV

ILED

11.1A/DIV

ILED

10A/DIV

LED Current Waveforms

(2000:1) 3A to 10A

CTRL_SEL

5V/DIV

ILED

5A/DIV

3743 G29

IL

10A/DIV

5μs/DIV

3743 G30

LED Current Waveforms (3000:1)

Analog Dimming on CTRL_L

COUT(LOW) = 22μF, COUT(HIGH) = 1mF

PWM

5V/DIV

CTRL_L

0.2V/DIV

CTRL_SEL

5V/DIV

ILED

8A/DIV

20μs/DIV

3743 G31

20μs/DIV

3743 G32

40μs/DIV

3743 G33

Voltage Regulation with 10A

Regulated Inductor Current

Common Mode Lockout (VIN = 7V)

Overvoltage Lockout Operation

With Open-Load Condition

VOUT

2V/DIV

VOUT

2V/DIV

IL

200mA/DIV

IL

5A/DIV

100μs/DIV

IL

200mA/DIV

3743 G34

1ms/DIV

VOUT

2V/DIV

3743 G35

40ms/DIV

3743 G36

3743fb

8

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