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PAM2846

Document number: DSxxxxx Rev. 1 - 2

1 of 14

www.diodes.com

November 2012

PAM2846

Product Line o

Diodes Incorporated

INTEGRATED 6 STRING LED BOOST TYPE DRIVER

Description

The PAM2846 is a high-efficiency boost type LED driver. It is

designed for large LCD panel that employs an array of LEDs as back

light source.

The PAM2846 employs a current-mode step-up converter that drives

six parallel strings of LEDs connected in multiple series. This built-in

string current-control circuit achieves ±1% typical current matching

between strings, which ensures even brightness for all LEDs. The

device is able to adapt to different numbers of LEDs in each string or

different forward voltage for different types of LEDs and keep the

string current constant.

Separate feedback loops limit the output voltage if one or more LEDs

open or short. The limit voltage of over voltage protection is

adjustable by changing the feedback resistor ratio. The PAM2846 has

features cycle-by-cycle current limit to provide consistent operation

and soft-start capability. A thermal-shutdown circuit provides another

level of protection.

The PAM2846 has a wide +4.8V to +28V input voltage range and

provides adjustable full-scale LED current. The switching frequency of

this device can be selected among 500kHz, 1MHz and 1.6 MHz

according to the application requirements.

Features

 Six Constant-Current Output Channels

 Parallel Channels Allow Higher Current per LED String

 Maximum 40V Continuous Voltage Output Limit for Each

Channel

 Self-adaptive V

OUT

to Fit Different LED Number

 Adjustable Constant LED Current

 Drives 10 or more LEDs Each String as Long as the String

Voltage Less Than 40V

 Internal 2.5A Power MOSFET

 Low 400mV Feedback Voltage at Full Current Improves

Efficiency

 Allows Digital PWM and Analog Dimming

 Wide (100:1) PWM Dimming Range without Color Shift

 Independent Dimming and Shutdown Control of the LED Driver

 Open LED Protection: Adjustable Clamp Voltage

 Short LED Protection

 3 Frequencies Selection: 1.6MHz/1MHz/500kHz

 Wide Input Voltage Range: 4.8V to 28V

 Over Temperature Protection

 Available in 24-pin 4mmx4mm QFN Package

 Pb-free Package

Pin Assignments

Applications

 White or RGB Backlighting for LCD TV, LCD Monitor, Notebook,

Handy Terminals, and Avionics Displays Panels

 LED Lighting Devices

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Inhaltsverzeichnis

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Seite 2 - Pin Descriptions

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Seite 3 - Absolute Maximum Ratings (@T

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Seite 4

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Seite 5

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Seite 6

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Seite 7

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Seite 8

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Seite 9 - Application Information

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Seite 10

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Seite 11 - PCB Layout Guidelines

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Seite 12 - Marking Information

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Seite 13

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Seite 14 - Diodes Incorporated

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Diodes PAM2846 Bedienungsanleitung

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