TDA7473 Datasheet, PDF (1/5 Pages) STMicroelectronics – QUAD BTL DRIVER WITH VOLTAGE REGULATOR

®
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
SO28 (24+2+2)
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
and it’s 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
VBG
-
+
+
VS/2
-
+
-
OUT 1+
M ^SPINDLE
MOTOR
OUT 1-
REG
R1
1K
ADJ
R2
1K
VBG
REFERENCE
VBG
-
+
+
VS/2
-
+
-
-
+
+
VS/2
-
+
-
OUT 2+
M
SLEDGE
MOTOR
OUT 2-
OUT 3+
TRACKING
ACTUATOR
OUT 3-
June 1998
+
-
ST_BY IN3 IN4 COMM
REF
-
+
VS/2
+
-
OUT 4+
FOCUS
ACTUATOR
OUT 4-
GND GND GND GND
D95AU223B
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