Datasheet > HV857

HV857

更新时间： 2023-12-06 20:08:30

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
9页	907K
描述
The HV857 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 s

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HV857 数据手册

Supertex inc.

HV857

Low Noise, High Voltage

EL Lamp Driver IC

Features

General Description

► Patented audible noise reduction

► Patented lamp aging compensation

► 190 V_PPoutput voltage for higher brightness

► Patented output timing for high efﬁciency

► Single cell lithium ion compatible

► 150nA shutdown current

The Supertex HV857 is a high voltage driver designed for driving

Electroluminescent (EL) lamps of up to 5.0 square inches. The

input supply voltage range is from 1.8 to 5.0V. The device uses

a single inductor and a minimum number of passive components.

The nominal regulated output voltage that is applied to the EL

lamp is ±95V. The chip can be enabled/disabled by connecting the

resistor on RSW-Osc to VDD/GND.

► Wide input voltage range 1.8 to 5.0V

► Separately adjustable lamp and converter

The HV857 has two internal oscillators, a switching MOSFET, and

a high voltage EL lamp driver. The frequency for the switching

MOSFET is set by an external resistor connected between

the RSW-Osc pin and the supply pin VDD. The EL lamp driver

frequency is set by an external resistor connected between REL-

Osc pin and VDD pin. An external inductor is connected between

the LX and VDD pins or V_INfor split supply applications. A 0.003-

0.1µF capacitor is connected between CS and ground. The EL

lamp is connected between VA and VB.

frequencies

► Output voltage regulation

► Split supply capability

► Available in 8-Lead MSOP and DFN packages

Applications

► LCD backlighting

► Mobile Cellular Phone

► PDAs

The switching MOSFET charges the external inductor and

discharges it into the capacitor at CS. The voltage at CS will start

to increase. Once the voltage at CS reaches a nominal value of

95V, the switching MOSFET is turned OFF to conserve power. The

outputs VA and VB are conﬁgured as an H bridge and are switching

in opposite states to achieve ±95V across the EL lamp.

► Handheld wireless communication products

► Global Positioning Systems (GPS)

Typical Application Circuit

ON = V_DD

OFF = 0

Enable Signal

VDD

HV857

R_SW

EL Lamp

V_DD

C_DD

RSW-Osc

REL-Osc

GND

R_EL

V_IN

C_IN

C_S

L_X

Doc.# DSFP-HV857

A062013

Supertex inc.

www.supertex.com

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