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dc2339af

DEMO MANUAL DC2339A

Quick start proceDure

Demonstration circuit 2339A is easy to set up to evalu-

ate the performance of the LT3744. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

1. With power off, connect the input power supply to PVIN

and GND. Note: make sure PVIN is below 36V. Con-

nect a DC supply or a PWM signal to PWM1, PWM2

and/or PWM3.

2. With power off, connect the LED load to VLED+ and

proper LED1–, LED2–, LED3– according to the setting

of the PWM pins.

3. Turn on the power at the input. Turn on PWM1, PWM2

and/or PWM3.

4. Carefully evaluate other design parameters as needed.

performance summary Specifications are at T

A = 25°C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PVIN

Input Supply Voltage

VLED+ = 5V

5.5

VLED+

Maximum Output Voltage

6.05

IOUT

Output Current

CTRL1, CTRL2, CTRL3 = 1.5V

fSW

Switching Frequency

380

425

470

kHz

EFF

Efficiency at DC

VIN = 12V, IOUT = 20A, VOUT = 5V

93.5

Figure 1. DC2339A Current Rise Time. VIN = 12V, LED Voltage = 4.2V when ON. Total LED Current = 20A

2.00µs/DIV

PWM

2V/DIV

PWM

(YELLOW)

2V/DIV

LED CURRENT

(GREEN)

6.67A/DIV

Description

LT3744 Datasheet(PDF) 2 Page - Linear Technology

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