Datasheet > HV857_07

HV857_07

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
9页	548K
描述
Low Noise, High Voltage EL Lamp Driver IC

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HV857_07 数据手册

HV857

Low Noise, High Voltage EL Lamp Driver IC

Features

General Description

The Supertex HV857 is a high voltage driver designed for driving

Electroluminescent (EL) lamps of up to 5 square inches. The

input supply voltage range is from 1.8V 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.

► 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

► Wide input voltage range 1.8V to 5.0V

► Separately adjustable lamp and converter

frequencies

► Output voltage regulation

► Split supply capability

The HV857 has two internal oscillators, a switching MOSFET,

and a high voltage ELlamp 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.

► Available in MSOP-8 and DFN-8 packages

Applications

► LCD backlighting

► Mobile Cellular Phone

► PDAs

► Handheld wireless communication products

► Global Positioning Systems (GPS)

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.

Typical Application Circuit

Enable Signal

ON = V_DD

OFF = 0

VDD

C_DD

R_SW

EL Lamp

V_DD

RSW-Osc

REL-Osc

GND

R_EL

L_X

C_S

C_IN

HV857MG

V_IN

12 3 4 5 6 7...9

中文翻译

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