Datasheet > HV853

HV853

更新时间： 2024-11-05 14:56:03

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
7页	603K
描述
HV853 is a high voltage, low noise EL (electroluminescent) lamp driver. It is the low noise versio

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HV853 数据手册

HV853

High Voltage, Low Noise,

Inductorless EL Lamp Driver

Features

General Description

► No external components required when using an

external EL clock frequency

The Supertex HV853 is a high voltage, low noise EL

(electroluminescent) lamp driver. It is the low noise version of

the HV852 with improved EMI performance, operating over an

input voltage range of 3.2V to 5.0V. It is designed to drive EL

lamps of up to 1.5in², with capacitive values up to 5.3nF. The

HV853 converts a low voltage DC input to a high voltage AC

output across an EL lamp. A nominal regulated output voltage

of ±80V is applied to the EL lamp. It uses a charge pump

scheme to boost the input voltage eliminating the need for an

external inductor, diode, and high voltage capacitor commonly

found in conventional topologies.

► Audible noise reduction with improved EMI

► EL frequency can be set by an external resistor

► DC to AC converter

► Drives up to 5.3nF (approx. 1.5in²lamp) load

► Output voltage regulation

► Enable function

► EL Lamp dimming

► Available in 10-Lead DFN and 8-Lead MSOP

packages

The charge pump circuit discharges its energy into an EL lamp

through a high voltage H-bridge. Once the voltage reaches

its regulated limit, it is turned off to conserve power. The EL

lamp is then discharged to ground and the H-bridge changes

state to allow the charge pump to charge the EL lamp in the

opposite direction.

Applications

► Cellular phone keypad

► Watches

► Small handheld wireless devices

► MP3 Players

The EL lamp frequency can be set either by an external

resistor R_ELor by applying an external clock where the clock

frequency is divided by 128 to set the EL lamp frequency.

Typical Application Circuits

V_DD= ON

GND = OFF

VDD

REL

VDD

REL

V_DD

LAMP

R_EL

C_DD

LAMP

GND

CLKIN CLKEN

V_DD

GND

HV853MG

EL Lamp Frequency set by R_EL

EL Lamp Frequency set by External Clock

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

12 3 4 5 6 7

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