HV8051

·Pagers
·Portable transceiver
·Cellular phones
·Remote control units
·Calculators

The Supertex HV8051 and HV8053 are high-voltage drivers designed for driving EL lamps of typically 4nF and 12nF for a 1V and 3V operation. The input supply voltage range is from 1.0V to 1.6V for HV8051 and 2.4V to 3.5V for HV8053. The device uses a single inductor and a minimum number of passive components. Typical output voltage that can be applied to the EL lamp is ±50V for HV8051 and ±70V for HV8053.

The HV8051/HV8053 has two internal oscillators, a switching bipolar junction transistor (BJT), and a high-voltage EL lamp driver. The frequency for the switching BJT is set by an external resistor connected between the R_sw-osc pin and the supply pin V_DD. The EL lamp driver frequency is set by an external resistor connected between R_EL-osc pin and the V^_DD pin. An external inductor is connected between the L_x and V_DD pins. A 0.1F capacitor is connected between Cs and GND pins. The EL lamp is connected between V_A and V_B pins.

The switching BJT charges the external inductor and discharges HV8051 into the 0.1F capacitor at Cs. The voltage at C_s will start to increase. The outputs V_A and V_B are configured as an H bridge and are switching in opposite states to achieve a peak-to-peak voltage of two times the V_CS voltage across the EL lamp.