Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSFP-HV809

B071013

HV809

Features

Applications

General Description

The Supertex HV809 is an off-line, high voltage, EL lamp

driver integrated circuit designed for driving EL lamps of up to

350nF at 400Hz. The input supply voltage can be a rectified

nominal 120V AC source or any other DC source up to 200V.

The HV809 will supply the EL lamp with an AC square wave

with a peak-to-peak voltage of two times the input DC voltage.

The HV809 has two internal oscillators, a low voltage output

linear regulator, and a high voltage output H-bridge. The high

voltage output H-bridge frequency is set by an external resis-

tor connected between the REL-Osc and GND pins. The EL

lamp is connected between pins VA and VB. For the HV809 in

the 8-pin package, an external RC network can be connected

between the oscillator’s Osc1 and Osc2 pins to pulse the EL

lamp on and off.

For detailed circuit and application information please refer to

Application Note AN-H36.

Block Diagram

GND

HVIN

VDD

Osc2

Osc1

REL-Osc

VA

VB

Q

Q

Q

Q

Logic

and

Osc

Linear

Regulator

Off-Line, High Voltage

EL Lamp Driver