HV823 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 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 by connecting the resistors on the RSW-Osc pin and the REL-Osc pin to the VDD pin, and disabled when connected to GND.The HV823 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 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 the VDD pin. A 0.01μF to 0.1μF capacitor is connected between the CS pin and the GND. The EL lamp is connected between the VAand 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 90V, 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 180V peak-to-peak across the EL lamp.

  Processed with HVCMOS?technology

  2.0 to 9.5V operating supply voltage

  DC to AC conversion

  180V 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