Datasheet > HV833

HV833

更新时间： 2024-11-05 14:55:11

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
8页	987K
描述
HV833 is a high voltage driver designed for driving EL lamps of up to 35nF (10-12in2). The input s

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HV833 数据手册

Supertex inc.

HV833

High Voltage

EL Lamp Driver

Features

General Description

► 1.8 to 6.5V operating supply voltage

The Supertex HV833 is a high voltage driver designed for driving EL

lamps of up to 35nF (10-12in²). The input supply voltage range is from

1.8 to 6.5V. 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 ±90V. The chip can be enabled/disabled by

connecting a resistor between the RSW-Osc pin and the VDD/GND

pins.

► DC to AC conversion

► Separately adjustable lamp and converter

frequency

► Output voltage regulation

► Enable/disable function

► Patented output timing for high efﬁciency

► <100nA shutdown current

► Split supply capability

The HV833 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 VDD supply pin. 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 pin and VDD

or VIN pin. A 0.003-0.1µF capacitor is connected between the CS pin

and the GND pin. The EL lamp is connected between the VA pin and

the VB pin.

► LCD backlighting

Applications

► Portable transceivers

► Remote control units

► Calculators

► PDAs

► 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 90V, 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 180V peak-to-peak across the EL lamp.

Typical Application Circuit

ON = V_DD

Enable Signal

OFF = 0

V_DD

VDD

EL Lamp

RSW-Osc

REL-Osc

GND

1N914

L_X

V_IN

C_S

100V

HV833

Doc.# DSFP-HV833

A061813

Supertex inc.

www.supertex.com

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