MIC4827BMM

更新时间： 2024-09-27 22:05:07

品牌	Logo	应用领域
麦瑞 - MICREL		驱动器
页数	文件大小	规格书
13页	145K
描述
Low Input Voltage, 180VPP Output Voltage, EL Driver

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MIC4827BMM 数据手册

MIC4827

Micrel

MIC4827

Low Input Voltage, 180V_PPOutput Voltage, EL Driver

Final Information

General Description

Features

Micrel’s MIC4827 is a high output voltage, DC to AC con-

verter, designed for driving EL (Electroluminescent) lamps.

The device operates from an input voltage range of 1.8V to

5.5V, making it suitable for 1-cell Li Ion and 2- or 3-cell

alkaline/NiCad/NiMHbatteryapplications.TheMIC4827con-

• 1.8V to 5.5V DC input voltage

• 180V regulated AC output waveform

• Independently adjustable EL lamp frequency

• Independently adjustable boost converter frequency

• 0.1µA shutdown current

vertsalowvoltageDCinputtoa180V ACoutputsignalthat

drives the EL lamp.

Applications

• LCD panel backlight

• Cellular phones

• PDAs

• Pagers

• Calculators

The MIC4827 is comprised of two stages: a boost stage, and

an H-bridge, lamp driver, stage. The boost stage steps the

inputvoltageupto+90V. TheH-bridgestagethenalternately

switches the +90V output to each terminal of the EL lamp,

thus creating a 180V AC signal to drive the EL lamp and

• Remote controls

• Portable phones

generate light.

The MIC4827 features separate oscillators for the boost- and

H-bridge stages. External resistors independently set the

operating frequency of each stage. This flexibility allows the

EL lamp circuit to be optimized for maximum efficiency and

brightness.

Ordering Information

Part Number

Ambient Temp. Range

Package

MIC4827BMM

–40°C to +85°C

MSOP-8

The MIC4827 uses a single inductor and a minimum number

of external components, making it ideal for portable, space-

sensitive applications.

The MIC4827 is available in an 8-pin MSOP package with an

ambient temperature range of –40°C to +85°C.

Typical Application

220µH

1N4148

V_IN

C_OUT

0.033µF/100V

C_IN

10µF

MIC4827

VDD

332k

RSW

REL

3.32M

GND

2in²EL LAMP

TIME (2ms/div)

High Voltage EL Driver

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

September 2001

MIC4827

12 3 4 5 6 7...13

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