HV830

High Voltage EL Lamp Driver IC

Features

Processed with HVCMOS® technology

2.0V to 9.5V operating supply voltage

DC to AC conversion

200V peak-to-peak typical output voltage

Large output load capability typically 50nF

Permits the use of high-resistance elastomeric lamp

components

Adjustable output lamp frequency to control lamp

color,lamp life, and power consumption

Adjustable converter frequency to eliminate harmonics

and optimize power consumption

Enable/disable function

Low current draw under no load condition

Very low standby current - 30nA typical

Applications

Handheld personal computers

Electronic personal organizers

GPS units

Pagers

Cellular phones

Portable instrumentation

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General Description

The Supertex HV830 is a high-voltage driver designed for

driving EL lamps of up to 50nF. EL lamps greater than 50nF

can be driven for applications not requiring high brightness.

The input supply voltage range is from 2.0V to 9.5V. The de-

vice uses a single inductor and a minimum number of passive

components. The nominal regulated output voltage that is

applied to the EL lamp is ±100V. The chip can be enabled by

connecting the resistors on the RSW-Osc and REL-Osc pins

to the VDD pin, and disabled when connected to GND.

The HV830 has two internal oscillators, a switching MOSFET

and a high-voltage EL lamp driver. The frequency of the

switching converter MOSFET is set by an external resistor

connected between the RSW-Osc and the VDD pins. The EL

lamp driver frequency is set by an external resistor connected

between the REL-Osc and the VDD pins. An external inductor

is connected between the LX and VDD pins. A 0.01µF to 0.1µF

capacitor is connected between the CS pin and the GND. The

EL lamp is connected between the VA and VB pins.

The switching MOSFET charges the external inductor and

discharges it into the CS capacitor. The voltage at CS will start

to increase. Once the voltage at CS reaches a nominal value

of 100V, the switching MOSFET is turned OFF to conserve

power. The output pins VA and VB are configured as an H-

bridge and are switched in opposite states to achieve 200V

peak-to-peak across the EL lamp.

Block Diagram

Disable

GND

VDD

REL-Osc

VA

CS

LX

VB

RSW-Osc

ENABLE

Q

Q

Q

Q

Output

Osc

Switch

Osc

C

+

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