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廬

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 PROTEC-

TION

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鈥檚 specially dedicated to compact disc players

SO28 (24+2+2)

and it鈥檚 capable of driving focus & tracking actua-

tors sledge & spindle motors.

The regulators are mainly used to have a 5V sup-

ply 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 3-

TRACKING

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

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