Datasheet > HV861

HV861

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
7页	680K
描述
Dimmable, Low Noise, Dual EL Lamp Driver

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HV861 数据手册

HV861

Dimmable, Low Noise, Dual EL Lamp Driver

The device uses a single inductor and a minimum number of

passive components. Using the internal reference voltage,

the regulated output voltage is at a nominal value of 90V.

The EL Lamps will therefore see 90V. The two EL Lamps

can be turned ON and OFF using two CMOS logic inputs,

EN1 and EN2. The driver is disabled when both EN1 and

EN2 are at logic low.

Features

► Adjustable output regulation for dimming

► Lamp fade-in/fade-out capability

► Low audible noise

► 180V_PPoutput voltage for higher brightness

► 1.5V enable input logic high

► Single cell lithium ion compatible

► One miniature inductor to power both lamps

► Separately adjustable lamp and converter frequencies

► Split supply capability

The HV861 has two internal oscillators, a switching MOSFET,

and two high voltage EL Lamp driver H-bridges. Each driver

has its own half bridge common output, COM1 and COM2,

which signiﬁcantly minimizes the DC offset seen by the EL

Lamp. 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 pin

and the VDD pin. An external inductor is connected between

the LX and VDD pins or VIN for split supply applications.

Depending upon the EL Lamp sizes, a 1.0nF to 10.0nF

capacitor is connected between the CS and ground.

► 16-Lead QFN package

Applications

► Dual display cellular phones

► Keypad and LCD backlighting

► PDAs

► Handheld wireless communication products

► Global Positioning Systems (GPS)

As 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 90V, the switching MOSFET is turned OFF

to conserve power.

General Description

The Supertex HV861 is a low noise, dimmable, high

voltage, dual EL Lamp driver designed for driving two

electroluminescent (EL) Lamps with a combined area of 5.0

square inches. The input supply voltage range is from 2.5V

to 4.5V. Enable input logic high can go as low as 1.5V, which

allows logic interface operating from typical 1.8V supplies.

The device is designed to minimize audible noise emitted by

the EL Lamps.

EL Lamp dimming can be accomplished by applying a PWM

logic signal to the PWM pin. The EL Lamp brightness will be

proportional to the PWM duty cycle. The HV861 can also

slowly turn the EL Lamp ON/OFF giving a fade ON/OFF

appearance.

Typical Application Circuit

V_IN= 3.2V to 4.2V

100µH Coilcraft

1N4148

4.7µF

LPS4012

3.3MΩ

3.3nF

100V NPO

VREG VOUT LX

EL1

VDD

_DD= 3.0V

2.0MΩ

EL1

EL2

REL-osc

RSW-osc

0.1µF

COM1

EL2

825kΩ

Input Logic Control:

ON = 1.5V to V_DD

OFF = 0V to 0.2V

EN1

EN2

VREF PWM

COM2

GND

2.2µF

HV861K7-G

12 3 4 5 6 7

中文翻译

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HV861K7-G	SUPERTEX	获取价格	Dimmable, Low Noise, Dual EL Lamp Driver
HV862	SUPERTEX	获取价格	Dimmable, Low Noise, Dual EL Lamp Driver
HV862K7-G	SUPERTEX	获取价格	Dimmable, Low Noise, Dual EL Lamp Driver
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HV8808PJ	ETC	获取价格	Interface IC

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