Microchip HV809 Manual

Microchip Ikke kategoriseret HV809

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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSAN-AN-H36
A040313
AN-H36
Application Note
HV809 EL Lamp Driver for Battery Powered
and Off-line Equipment
by Scott Lynch, Senior Applications Engineer
Introduction
The Supertex HV809 is designed to drive large lamps at
high brightness. It can operate from a rectied/ltered 120V
AC power line or from any DC source in the range of 50 to
200V. For use in battery powered applications, an external
DC-DC converter is required.
This application note is divided into two sections, portable
applications and off-line applications. Section I describes the
operation of the Supertex’s HV809 EL lamp driver for a battery
operated (4 AA cells) application to drive a 12.5in2 EL lamp
to a brightness of 15ft-lm. Details are provided for designing
a high voltage output DC-DC converter. Applications can be
for PDA’s, GPS’s, hand held computers, and other portable
devices requiring high brightness EL backlighting. Section II
describes the HV809 operating from a 120V AC line to drive
a 100in2 EL lamp to a brightness of 20ft-lm. Applications can
be signage, courtesy lighting, and accent lighting.
Section I - Portable Applications
The basic circuit conguration is shown in Figure 1. There
are many different implementations in designing the DC-DC
converter. In this design, an inexpensive 555 timer IC was
used for the DC-DC converter. Details of the converter are
discussed in a later section.
Lamp Driver Circuit and Operation
The Supertex HV809 is capable of driving EL lamps of up to
350nF at 400Hz. Input supply can be any DC voltage source
from 50 to 200V. The HV809 supplies the EL lamp with an
AC square wave with a peak-to-peak voltage of two times
the input DC voltage.
The HV809 incorporates a lamp drive oscillator with frequency
controlled by a single resistor, REL-osc. The oscillator controls
the lamp driver output section, which consists of 4 transistors
arranged in a full bridge conguration as shown in Figure 2.
Figure 2: HV809 Lamp Driver
Figure 1: HV809 for Portable Applications
A1
A2
GND
REL
HVIN
VDD
OSC2
OSC1
HV809
DC-DC
Converter
CDD
REL
EL
Lamp
Batteries
HVOUT
VIN
Linear
Regulator
GND
HVIN
VDD
OSC2
OSC1
REL-Osc
Q
Q
Q
VA
Q
Logic
and
Osc
VB

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV809

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