Datasheet > HV850

HV850

更新时间： 2023-12-06 20:09:23

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
7页	592K
描述
HV850 is a high voltage electroluminescent (EL) Lamp Driver IC. It is designed to drive EL lamps o

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HV850 数据手册

Supertex inc.

HV850

High Voltage, Low Noise,

Inductorless EL Lamp Driver

Features

General Description

► No external components required when using an

The Supertex HV850 is a high voltage electroluminescent

(EL) Lamp Driver IC. It is designed to drive EL lamps of up to

1.5in², with capacitive values up to 5.0nF. The HV850 converts

a low voltage DC input to a high voltage AC output across an

EL lamp. It uses a charge pump scheme to boost the input

voltage, eliminating the need for external inductors, diodes,

and high voltage capacitors, components commonly found in

conventional topologies.

external EL clock frequency

► EL frequency can be set by an external resistor

► Low noise

► DC to AC converter

► Drives up to 5.0nF load (approx. 1.5in²lamp)

► Output voltage regulation

► Enable function

► EL Lamp dimming

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

► Cell phone keypads and displays

► Transceivers

► MP3 players

The EL lamp frequency can be set either by an external

resistor, R_EL,or by applying an external clock, where the clock

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

► Watches

► Pagers

► Measuring instruments/gauges

Typical Application Circuits (For V_DD= 3.4V to 4.2V only)

V_DD= ON

GND = OFF

VDD

REL

EL Lamp

V_DD

HV850

C_DD

GND 6

V_DD

CLKIN CLKEN

GND

EL lamp frequency

set by an external clock

VDD

REL

R_EL

HV850

EL Lamp

V_DD

C_DD

GND 6

V_DD= ON

GND = OFF

CLKEN

CLKIN

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

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