DC1319B-A Linear Technology, DC1319B-A Datasheet

DC1319B-A

Manufacturer Part Number

DC1319B-A

Description

BOARD EVAL LED DRIVER LT3756

Manufacturer

Linear Technology

Datasheets

1.LT3756EUD-1PBF.pdf (24 pages)

2.DC1319B-A.pdf (7 pages)

Specifications of DC1319B-A

Current - Output / Channel

500mA

Outputs And Type

1, Non-Isolated

Voltage - Output

100V

Features

Dimmable

Voltage - Input

8 ~ 80V

Utilized Ic / Part

LT3756

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

DC1319A-A
DC1319A-A

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DESCRIPTION

Demonstration circuit 1319A-A, 1319A-B is a high

voltage and high current LED driver controller. The

VIN pin input voltage is as high as 100V, and the LED

output voltage is also as high as 100V. The demon-

stration circuit is assembled as a boost topology from

8-80V input and up to 80V LED output at 0.5A with an

open LED status pin (-A) or a sync input pin (-B).

DC1319A features PWM dimming, analog dimming,

shutdown, and open LED overvoltage protection. Effi-

ciency at 12VIN is as high as 91% for 40W output.

The switching frequency is set at 300kHz to accom-

modate the automotive switching frequency range.

Small ceramic input and output capacitors are used

to save space and cost and a high voltage 100V ex-

ternal power switch and a 100V catch diode are used

for up to 40W (80V at 0.5A) output as assembled.

The open LED overvoltage protection will limit the

output to approximately 92V if the LED string is

opened.

NOTE:

the open LED voltage of 92V are possible with limita-

tions to low input voltage operation. Please consult

the factory.

For low input voltage operation, the CTRL pin voltage

is reduced as the input voltage drops below 10V, re-

ducing LED brightness and restraining the peak

switch currents in order to limit inductor and switch

size. UVLO is employed to turn the LEDs off when

VIN drops below 8V.

DC1319A PWM dimming is simple. The boost topol-

ogy LED string returns to the LED- terminal and the

PWM dimming MOSFET turns the LED string on and

LED output voltages above 80V but less than

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1319A-A, 1319A-B

off given an input to the PWM dimming terminal. For

the highest pwm dimming ratio, it is recommended to

use 100Hz as a pwm dimming frequency. Information

regarding PWM dimming ratios and performance can

be found in the LT3756/-1 datasheet in the applica-

tions section.

Soft-start is provided with a simple and small capaci-

tor to maintain control of the switch current during

turn on for high power designs.

Modifications can be made to the DC1319A in order

to convert the board from a boost topology LED

driver to any other topology. Please consult the fac-

tory or LT3756/-1 datasheet for details regarding how

to customize the DC1319A or how to design different

topologies for custom specifications.

The LT3756, LT3756-1 datasheet gives a complete

description of the part, operation and applications

information. The datasheet must be read in conjunc-

tion with this Quick Start Guide for demonstration

circuit 1319A-A, 1319A-B. The LT3756, LT3756-1 is

assembled in a small 16-lead plastic MSOP or QFN

package with a thermally enhanced ground pad.

Demonstration circuit 1319A-A, 1319A-B uses the

MSOP package. Proper board layout is essential for

maximum thermal performance. See the datasheet

section ‘Layout Considerations’.

Design files for this circuit board are available. Call

the LTC factory.

LT is a trademark of Linear Technology Corporation

HIGH VOLTAGE LED CONTROLLER

LT3756, LT3756-1

Related parts for DC1319B-A

DC1319B-A Summary of contents

Page 1

... Demonstration circuit 1319A-A, 1319A-B uses the MSOP package. Proper board layout is essential for maximum thermal performance. See the datasheet section ‘Layout Considerations’. Design files for this circuit board are available. Call the LTC factory trademark of Linear Technology Corporation 1 ...

Page 2

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1319A-A, 1319A-B Table 1. Typical Performance Summary for DC1319A-A/B PARAMETER Input Voltage PVIN Range Switching Frequency I LED Open LED Voltage Efficiency Under Voltage Lockout Peak Switch Current Limit QUICK START PROCEDURE Demonstration circuit ...

Page 3

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1319A-A, 1319A-B Figure 1. Test procedure setup drawing for DC1319A-A and DC1319A-B TWO ICS, THREE TOPOLOGIES DC1319A features two build versions. DC1319A-A uses the LT3756EMSE with an open LED status and HIGH VOLTAGE LED ...

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DC1319B-A Linear Technology, DC1319B-A Datasheet

DC1319B-A

Specifications of DC1319B-A

Related parts for DC1319B-A

DC1319B-A Summary of contents

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