INTERNAL CLOCK GENERATION

STAND-BY FUNCTION

VOLTAGE SET-UP CONVERSION FUNCTION

ANTI-RADIATION TRAPEZOIDAL WAVE FOR

E.L. DISPLAY DRIVING

CONSTANT CURRENT CHARGE/DISCHARGE

OF E.L. DISPLAY

2-STEP BRIGHTNESS CONTROL (NORMAL

OR DIMMED LUMINANCE)

PROTECTIONS WITH AUTOMATIC RESET:

- COIL-SWITCHING MOS OVERCURRENT

- CHIP OVERTEMPERATURE

DESCRIPTION

The TDA7475 is a new BCD OFF-LINE technology

device intended for EL display lighting in carradio

applications. Time-extended luminance is

achieved by driving the display with constant-current

pulses, which will automatically compensate

for the ageing-related capacitance loss by providing

more elevated voltage pulses.