1

HV809

Features

Input voltage up to 200V DC

400V peak-to-peak output voltage

lamp)

Adjustable output lamp frequency

Adjustable on/off pulsing frequency

Applications

Electronic organizers

Handheld portable computers

Display signs

Portable instrumentation equipment

►

►

►

►

►

►

►

►

►

►

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 resistor

connected between the R

connected between pins V

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

Linear

Regulator

GND

Osc2

Osc1

Q

Q

Q

Q

Logic

and

Osc

Off-Line, High Voltage EL Lamp Driver