TDA7473

® TDA7473 QUAD BTL DRIVER WITH VOLTAGE REGULATOR 4 BUILT-IN POWER BRIDGES (4 x 0.6A) NO EXTERNAL COMPONENTS SINGLE POWER SUPPLY WIDE SUPPLY VOLTAGE RANGE (6 TO 15V) 5V REGULATOR DRIVER FOR EXTERNAL PASS TRANSISTOR WITH FOLD-BACK SHORT CIRCUIT PROTECTION ADJUSTABLE REGULATOR (2.0 TO 3.6V @ 200mA) WITH SHORT CIRCUIT PROTECTION DESCRIPTION This device is a quad power driver circuit in BTL configuration, intended for use as a power driver for servo systems with a single supply. It’s specially dedicated to compact disc players SO28 (24+2+2) and it’s capable of driving focus & tracking actuators sledge & spindle motors. The regulators are mainly used to have a 5V supply for the power part and a lower programmable voltage for the logic circuits. Figure 1: Quad BTL Power Bridges + Multifunction Regulators. + VSUP OC DRIV 5V IN2 IN1 VS1 VS2 VS3 VS4 + VS/2 + OUT 1+ SPINDLE MOTOR VBG M + OUT 1- REG + + VS/2 + - OUT 2+ SLEDGE MOTOR R1 1K - M OUT 2- ADJ R2 1K VBG + REFERENCE VBG VS/2 + + OUT 3TRACKING ACTUATOR OUT 3+ + + VS/2 + - OUT 4+ FOCUS ACTUATOR OUT 4- ST_BY IN3 IN4 COMM REF GND GND GND GND D95AU223B June 1998 1/5 TDA7473 PIN CONNECTION (Top view) 5V VSUP OUT1VS1 OUT1+ OC GND GND ADJ OUT2+ VS2 OUT2ST_BY REG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 D95AU310A 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DRIV IN1 OUT4VS4 OUT4+ IN4 GND GND IN3 OUT3+ VS3 OUT3IN2 COMM PIN FUNCTIONS N. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 2/5 N...