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HV824

Supertex
Part Number HV824
Manufacturer Supertex
Description High Voltage EL Lamp Driver
Published Feb 15, 2007
Detailed Description www.DataSheet4U.com HV824 Advanced Information High Voltage EL Lamp Driver Ordering Information Package Options Device...
Datasheet PDF File HV824 PDF File

HV824
HV824

Overview
www.
DataSheet4U.
com HV824 Advanced Information High Voltage EL Lamp Driver Ordering Information Package Options Device HV824 Input Voltage 1.
0V to 1.
6V 8-Lead SO HV824LG Die HV824X Features Processed with HVCMOS® technology 1.
0V to 1.
6V supply voltage DC to AC conversion Permits the use of high-resistance elastomeric lamp connectors 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 General Description The Supertex HV824 is a high voltage driver designed to drive EL lamps with capacitive loads of 2nF to 15nF.
The input supply voltage range is 1.
0V to1.
6V.
The device uses a single inductor and a minimum number of passive components.
Typical output voltage applied to the EL lamp is 120V to 150V peak-to-peak.
The HV824 can be enabled/disabled by connecting the R SW resistor to VDD/ground.
In die form, the device has an enable bar pad which enables the IC when it is at logic low.
The HV824 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 Rsw-osc pin and the VDD pin.
The EL lamp driver frequency is set by an external resistor connected between the REL-osc pin and the VDD pin.
An external inductor is connected between the Lx and VDD pins.
A 0.
01µF to 0.
1µF capacitor is connected between Cs and GND pins.
The EL lamp is connected between VA and VB.
The switching MOSFET charges the external inductor and discharges it into the 0.
01µF to 0.
1µF capacitor at Cs.
The voltage at CS will start to increase.
Once the voltage at Cs reaches a nominal value of 75V, the switching MOSFET is turned OFF to conserve power.
The outputs VA and VB are configured as an H-bridge and are switching in opposite states to achieve a maximum voltage of 180V peak-to-peak across the EL lamp...


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