PD24012L [MICROSEMI]

Interface Circuit;


型号：	PD24012L
厂家：	Microsemi
描述：	Interface Circuit
文件：	总4页 (文件大小：517K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Introduction: DAZL!^TMLED Drivers

Value Proposition

Advanced Power Management - To minimize overall

system power dissipation, DAZL! adaptively control RGB

power supplies output voltage levels based on advance

power management algorithm.

Microsemi's DAZL! Family of mixed signal high voltage LED

driver ICs is designed for LCD panel backlights using strings

of either red, green, and blue (RGB) or white LEDs.

Fault Detection - DAZL! ICs constantly monitor the cur-

rent and voltage of all LED strings at a high sample rate.

This data is saved and sent to a companion PD23000

32-bit system controller.

The high sample rate enables the system controller to

respond quickly to detected faults due to LED opens

and/or shorts.

Advanced Control of Color & Brightness Uniformity -

DAZL! ICs feature individually controlled internal PWMs

for each of their 12 ports. Frequencies range from 150Hz

to 16KHz. Individual PWMs allow for independent control

of the current in each string, adjusting automatically for

current mismatches between strings to enable more accu-

rate color and brightness uniformity.

DAZL^TMLED drivers are ideal for LCD TVs and other

large LCD-based displays.

Advanced Backlight features - The advanced features

of the DAZL! Family enables it to support zone dimming

(D2) and scanning backlights (D1). Multiple bus interfaces

in the form of two SPI buses that can work in parallel offer

higher bandwidth--and the ability to control up to 30

PD24012 ICs and 360 LED strings with a single PD23000

32-bit system controller.

The DAZL! Family integrates all necessary power,

analog and logic functions while supporting multiple LED

strings in a compact monolithic package.The ICs drives LED

strings, while simultaneously monitoring and measuring

backlight string voltage and current to control power supply

voltage for optimum performance.

Risk & Cost Reduction - The DAZL! Family is designed

to provide significant cost reductions for LED backlight

manufacturers. The independent PWMs on each of the 12

ports allow LED strings of any color to be connected to

any port. This flexibility provides a universal solution to

accommodate a variety of LED string combinations, such

as 4R-4G-4B or 3R-6G-3B LEDs. Identical packages and

pin outs between the PD24012H and PD24012L drivers

allow for similar architecture, design and layout considera-

tions for both low-power and high-power LEDs, reducing

development time and risk for a faster time-to-market.

The DAZL! Family consists of two ICs, designed for back-

light units having either high-power or low-power LEDs:

For high-power LEDs, the PD24012H is capable of driving

external MOSFETs for a string current of up to 1.5A on each

of 12 ports.

For low-power LEDs, the PD24012L features on-chip

MOSFETs capable of driving a string current of up to 60mA

on each of its 12 ports. With 65V output voltage supporting

each LED string, the PD24012L can accommodate at least

15 low power LEDs per string without external MOSFETs.

(~ Vf = 3.5V)

Both DAZL! driver ICs feature 12 independent ports capable

of driving 12 LED strings. Each string is controlled by inde-

pendent PWM circuitry that adjusts string current for the

desired color and intensity.

Pin Configuration

Current, output port voltage and temperature are monitored

separately for sophisticated control of each LED string. A

temperature sensor at each port automatically shuts down

the port in the event of excessive thermal stress.

All PD24012 driver ICs are designed to support a full set of

advanced features including scanning backlight (D1) and

zone dimming (D2). They also support two external SPI

buses that can work independently, or in parallel.

A single SPI bus provides full functionality. When in parallel,

one SPI bus is used for initialization and monitoring of val-

ues, while the second interfaces directly to a video con-

troller, enabling direct control of enable/disable ports and

PWM values.

DAZL! Features

Evaluation Environment

LED Driver:

• 12 ports to drive 12 LED strings

Performance of PD24012 ICs can be fully evaluated using

the Microsemi PD25000EV Evaluation Board.

• Low power LEDs (up to 60mA) driven

by internal MosFETs

• High Power LEDs (up to 1.5A)

driven by external MosFETs

• Up to 2.1W chip power dissipation

Communication Interface:

• 2x SPI buses for:

- Enhanced SPI for system control

- SPI to system host - such as video

controller

- Direct interface to color manager

Protection:

• Short Circuit Protection

• Open Circuit indication

• Over Temperature Protection

PWM:

• 12 PWMs (each port has its own PWM)

• Frequency 150Hz-16KHz

Power Supply:

• Operating Supply Voltage: 5V

• Output Voltage: 65V

• I/O Voltage: 3.3V or 5V

Working Modes

• Normal Mode for standard operation

• Sleep Mode for power saving

Operating Temperature: -20°C to +85°C

Package: LQFP

RoHS Compliant

PD24012H

PD24012L

LED Driver supporting

High Power LEDs using

External MOSFET

LED Driver supporting

Low Power LEDs using

internal MOSFET

Ordering Information

Part Number

Description

PD24012L

12 port LED driver with internal MosFETs

for Low Power LEDs

PD24012H

12 port LED driver for High Power LEDs

Analog Mixed Signal Group

11861 Western Avenue

Garden Grove, CA 92841

USA

Phone: (714) 372-8080

www.microsemi.com

Microsemi is a trademark of Microsemi Corporation. All other trademarks are property of their respective owners. Information in this document is

subject to change without notice. This document contains information that is proprietary to Microsemi. As such, it is confidential and its disclosure is

strictly prohibited by applicable law. If you and/or your company and Microsemi executed a Non-Disclosure Agreement, then this document is being

provided in connection with the Agreement, and the information contained herein is covered by the Agreement and under its terms may not be disclosed

or used and must be protected by you and/or your company.

PD24012L [MICROSEMI]

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