Datasheet > HV850

HV850

更新时间： 2024-11-04 03:43:11

品牌	Logo	应用领域
超科 - SUPERTEX		驱动器
页数	文件大小	规格书
6页	243K
描述
High Voltage Low Noise Inductorless EL Lamp Driver

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HV850 数据手册

HV850

________________________________________________________________________________

Initial Release

High Voltage Low Noise Inductorless EL Lamp Driver

Features

General Description

Supertex HV850 is a high voltage electroluminescent

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

of up to 2.0in², with capacitive values up to 4.5nF.

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 an external inductor, diode,

and high voltage capacitor commonly found in

conventional topologies.

ꢀ No external components required when using an

external EL clock frequency

ꢀ EL frequency can be set by an external resistor

ꢀ Low Noise

ꢀ DC to AC converter

ꢀ Drives up to 4.5nF load (approx. 2.0²inches)

ꢀ Output voltage regulation

ꢀ Enable function

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

ꢀ Watches

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.

ꢀ Pagers

ꢀ Measuring instruments/gauges

Typical Application Circuits

V_DD=ON

GND=OFF

V_DD=ON

V_A

GND=OFF

V_DD

R_EL

V_DD

R_EL

C_DD

V_B

Lamp

V_A

V_B

V_DD

R_EL

V_DD

GND

C_DD

Lamp

Clk-in

Clk-en

GND

HV850MG

Clk-in

Clk-en

V_DD

GND

HV850MG

EL lamp frequency set by R_EL

EL lamp frequency set by an external clock

Supertex, Inc.

1/21/04

12 3 4 5 6

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