HV833

Supertex inc. HV833 High Voltage EL Lamp Driver Features ►►1.8 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 Applications ►►Portable transceivers ►►Remote control units ►► Calculators ►► PDAs ►►Global Positioning Systems (GPS) General Description The Supertex HV833 is a high voltage driver designed for driving EL lamps of up to 35nF (10-12in2). The input supply voltage range is from 1.8 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 a resistor between the RSW-Osc pin and the VDD/GND pins. 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 RSW-Osc pin and the VDD supply 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 pin and VDD or VIN pin. A 0.003-0.1µF capacitor is connected between the CS pin and the GND pin. The EL lamp is connected between the VA pin and the VB pin. The switching MOSFET charges the external inductor and discharges ...