MIC4827YMM

更新时间： 2024-11-21 07:17:03

品牌	Logo	应用领域
麦瑞 - MICREL		驱动器
页数	文件大小	规格书
15页	402K
描述
Low Input Voltage, 180VPP Output Voltage, EL Driver

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MIC4827YMM 数据手册

MIC4827

Low Input Voltage, 180V_PPOutput Voltage,

EL Driver

General Description

Features

• 1.8V to 5.5V DC input voltage

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-

• 180V_PPregulated AC output waveform

• Independently adjustable EL lamp frequency

• Independently adjustable boost converter frequency

• 0.1µA shutdown current

cellalkaline/NiCad/NiMH

battery

applications.

The

MIC4827 converts a low voltage DC input to a 180V_PPAC

output signal that drives the EL lamp.

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

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

the input voltage up to +90V. The H-bridge stage then

alternately switches the +90V output to each terminal of

the EL lamp, thus creating a 180V_PPAC signal to drive the

EL lamp and generate light.

Applications

• LCD panel backlight

• Cellular phones

• PDAs

• Pager

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.

• Calculators

• Remote controls

• Portable phones

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

BAV20WS

V_IN

C_OUT

0.033µF/100V

C_IN

10µF

MIC4827

VDD

332k

RSW

REL

3.32M

GND

TIME (2ms/div)

2in²EL LAMP

High Voltage EL Driver

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M9999-070709-A

(408) 955-1690

July 2009

12 3 4 5 6 7...15

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