FEATURES
► No external components required when using an external EL clock frequency ► Audible noise reduction with improved EMI ► EL frequency can be set by an external resistor ► DC to AC converter ► Drives up to 5.3nF (approx. 1.5in2 lamp) load ► Output voltage regulation ► Enable function ► Available in 8-Lead DFN and MSOP packages GENERAL DESCRIPTION
The Supertex The HV853 converts a low voltage DC input to a high voltage AC output across an EL lamp. A nominal regulated output voltage of ±80V is applied to the EL lamp. It uses a charge pump scheme to boost the input voltage eliminating the need for an external inductor, diode, and high voltage capacitor commonly found in conventional topologies. The charge pump circuit discharges its energy into an EL lamp through a high voltage H-bridge. Once the voltage reaches its regulated limit, it is turned off to conserve power. The EL lamp is then discharged to ground and the H-bridge changes state to allow the charge pump to charge the EL lamp in the opposite direction.
Supertex
