Datasheet > HV861

HV861

更新时间： 2024-09-28 14:55:55

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
18页	1799K
描述
HV861 is a low noise, dimmable, high voltage, dual EL Lamp driver designed for driving two electro

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HV861 数据手册

HV861

Low-Noise Dimmable Dual EL Lamp Driver

Features

General Description

• Adjustable Output Regulation for Dimming

• Lamp Fade-in/Fade-out Capability

• Low Audible Noise

The 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 in². 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.

• 180 V_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

The device uses a single inductor and a minimum

number of passive components. With the internal

reference voltage, the regulated output voltage is at a

nominal value of 90V. The EL lamps therefore see ±90V.

The two EL lamps can be turned on and turned off using

two CMOS logic inputs, EN1 and EN2. The driver is

disabled when both EN1 and EN2 are at logic low.

• Split Supply Capability

Applications

• Dual Display Cellular Phones

• Keypad and LCD Backlighting

• Personal Digital Assistant (PDA)

• Handheld Wireless Communication Products

• Global Positioning Systems (GPS)

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 R_SW-Oscpin and the supply pin,

V_DD. The EL lamp driver frequency is set by an external

resistor connected between the R_EL-Oscpin and the V_DD

pin. An external inductor is connected between the L_X

and V_DDpins or V_INfor split supply applications.

Depending upon the EL lamp sizes, a 1 nF to 10 nF

capacitor is connected between the C_Sand ground. As

the switching MOSFET charges the external inductor

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

C_Sstarts to increase. Once the voltage at C_Sreaches a

nominal value of 90V, the switching MOSFET is turned

off to conserve power.

EL lamp dimming can be accomplished by applying a

PWM logic signal to the PWM pin. The EL lamp

brightness will be inversely proportional to the PWM duty

cycle. The HV861 can also slowly turn on or turn off the

EL lamp, giving a fade on/off appearance.

Package Type

16-lead WQFN

(Top view)

VREF VREG VOUT PWM

REL-Osc

RSW-Osc

VDD

EL1

COM1

10 COM2

EL2

EN1

See Table 2-1 for pin information.

EN2 GND LX

 2023 Microchip Technology Inc. and its subsidiaries

DS20005911A-page 1

12 3 4 5 6 7...18

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