HV857L

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
8页	700K
描述
Low Noise, High Voltage EL Lamp Driver IC

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HV857L 数据手册

HV857L

Low Noise, High Voltage EL Lamp Driver IC

Features

► Audible noise reduction

► 190 V_PPoutput voltage for higher brightness

► Single cell lithium ion compatible

► 150nA shutdown current

► Wide input voltage range 1.8V to 5.0V

► Separately adjustable lamp and converter

frequencies

General Description

The Supertex HV857L is a low noise, high voltage driver

designed for driving Electroluminescent (EL) lamps of up to ﬁve

square inches. It is the low noise version of the EL lamp driver

HV857. 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/ground.

► Output voltage regulation

The HV857L 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 the REL-Osc and VDD pins. An external inductor is

connected between the LX and VDD pins, or VIN for split supply

applications. A 0.003-0.1µF capacitor is connected between CS

and ground. The EL lamp is connected between the VA and VB

pins.

► Split supply capability

► Available in DFN-8 and MSOP-8 packages

Applications

► Mobile cellular phones

► Keypad backlighting

► LCD backlighting

► 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

C_IN

V_IN

C_S

L_X

HV857LMG

12 3 4 5 6 7 8

中文翻译

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