Datasheet > HV862

HV862

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	694K
描述
Dimmable, Low Noise, Dual EL Lamp Driver

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HV862 数据手册

HV862

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 HV862 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 R_SW-oscpin and the

supply pin V_DD. The EL Lamp driver frequency is set by an

► 16-Lead QFN package

Applications

► Dual display cellular phones

► Keypad and LCD backlighting

► PDAs

► Handheld wireless communication products

► Global Positioning Systems (GPS)

external resistor connected between the R

pin and the

V_DDpin. An external inductor is connected^ELb^-oe^st^cween the L_X

and V_DDpins or V_INfor split supply applications. Depending

upon the EL Lamp sizes, a 1.0nF to 10.0nF capacitor is

connected between the C_Sand ground.

As the switching MOSFET charges the external inductor

and discharges it into the capacitor at C , the voltage at

C_Swill start to increase. Once the voltage^Sat C reaches a

nominal value of 90V, the switching MOSFET is^Sturned OFF

to conserve power.

General Description

The Supertex HV862 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 HV862 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

V_REGV_OUTL_X

C_S

EL1

V_DD

_DD= 3.0V

2.0MΩ

EL1

EL2

R_EL-osc

R_SW-osc

0.1µF

COM1

EL2

825kΩ

Input Logic Control:

ON = 1.5V to V_DD

OFF = 0V to 0.2V

EN1

EN2

COM2

PWM GND

V_REF

2.2µF

HV862K7-G

12 3 4 5 6 7

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与HV862相关器件

型号	品牌	获取价格	描述	数据表
HV862K7-G	SUPERTEX	获取价格	Dimmable, Low Noise, Dual EL Lamp Driver
HV8708DJ	ETC	获取价格	Interface IC
HV8708PJ	ETC	获取价格	Interface IC
HV8708X	ETC	获取价格	Interface IC
HV87SM-42	SPECTRUM	获取价格	Voltage Controlled Oscillator
HV87T-4	SPECTRUM	获取价格	Voltage Controlled Oscillator
HV8808DJ	ETC	获取价格	Interface IC
HV8808PJ	ETC	获取价格	Interface IC
HV8808X	ETC	获取价格	Interface IC
HV881	SUPERTEX	获取价格	Dimmable, Low Noise, 16 channel EL Lamp Driver

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