HV809
Off-Line, High Voltage EL Lamp Driver
Features
►
Processed with HVCMOS
®
technology
►
Input voltage up to 200V DC
►
400V peak-to-peak output voltage
►
Output load up to 350nF (100 in
2
for 3.5nF/in
2
lamp)
►
Adjustable output lamp frequency
►
Adjustable on/off pulsing frequency
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
EL-Osc
and GND pins. The EL lamp is
connected between pins V
A
and V
B
. 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.
Applications
►
Electronic organizers
►
Handheld portable computers
►
Display signs
►
Portable instrumentation equipment
Block Diagram
HV
IN
Linear
Regulator
Q
V
A
Q
V
DD
Osc1
Osc2
R
EL-Osc
Q
Logic
and
Osc
V
B
Q
GND
1
SUPERTEX [ Supertex, Inc ]
