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HV833

HV833

High Voltage EL Lamp Driver

Features

❏ 1.8V to 6.5V operating supply voltage

❏ DC to AC conversion

❏ Separately adjustable lamp and converter frequency

❏ Output voltage regulation

❏ Enable/disable function

❏ Patented output timing for high efficiency

❏ <100nA shutdown current

❏ Split supply capability

❏ LCD backlighting

General Description

The Supertex HV833 is a high voltage driver designed for driving

range is from 1.8V to 6.5V. The device uses a single inductor and

a minimum number of passive components. The nominal

regulated output voltage that is applied to the EL lamp is ±90V.

The chip can be enabled/disabled by connecting the resistor on

R

The HV833 has two internal oscillators, a switching MOSFET,

and a high voltage EL lamp driver. The frequency for the

switching MOSFET is set by an external resistor connected

between the R

driver frequency is set by an external resistor connected between

R

between the L

connected between C

between V

The switching MOSFET charges the external inductor and

discharges it into the capacitor at C

to increase. Once the voltage at C

90V, the switching MOSFET is turned OFF to conserve power.

The outputs V

switching in opposite states to achieve 180V peak-to-peak

across the EL lamp.

Applications

❏ Portable Transceivers

❏ Remote Control Units

❏ Calculators

❏ PDAs

❏ Global Positioning Systems (GPS)

05/02/02

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

Demo Kit

Available

EL Lamp

+

_

1

2

3

4

8

6

5

HV833MG

7

Gnd

Enable Signal

OFF=0

1N914

Cs

100V

Typical Application