DESCRIPTION

The TK6591x Electroluminescent (EL) Lamp Driver has been optimized for battery controlled systems where power consumption and size are primary concerns. The miniature device size (SOT23L-6), together with the miniature Toko EL coils (D32FU, D31FU, D52FU), further helps system designers reduce the space required to drive the small EL panels.

The proprietary architecture (detailed in the Theory of Operation section) of the TK6591x provides a constant output power to the lamp, independent of variations in the battery voltage. This architecture allows the output voltage to remain relatively constant as battery voltages decay, without the need for directly sensing the high voltage output of the EL driver.

FEATURES

■ High Ratio of Brightness / Input Power

■ Constant Brightness Versus Input Supply Changes

■ Optimized for 3.5 nf to 12.5 nf Panel Capacitance

■ Panel Voltage Slew Rates Controlled for Life Enhancement

■ Panel Peak to Peak Voltage Independent of Input Voltage and Temperature

■ Panel Peak to Peak Frequency Independent of Input Voltage and Temperature

■ Miniature Package (SOT23L-6)

■ Operates with Miniature Coil

■ Minimum External Components

■ Laser-Trimmed Fixed Frequency Operation

■ PWM Control Method

■ Adjustable Output Voltage

■ Lower Noise (Audio and EMI)

■ Split Power Supply Application

APPLICATIONS

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ LCD Modules

■ Wrist Watches

■ Consumer Electronics