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PAM2845

Document number: DSxxxxx Rev. 1 - 2

1 of 14

www.diodes.com

October 2012

PAM2845

Product Line o

Diodes Incorporated

40V HIGH POWER BOOST CONVERTER with

6 CHANNEL CONSTANT CURRENT SOURCE

Description

The PAM2845 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 PAM2845 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.

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

open or short. The PAM2845 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 PAM2845 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 1.6MHz

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

• Adjustable Constant Output Voltage

• 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

• Allows Digital PWM and Analog Dimming

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

• Independent Dimming and Shutdown Control of the LED Driver

• ±1% Typical Current Matching between Strings

• 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

Seite 1 - © Diodes Incorporated

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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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