Datasheet TDA7473 Datasheet (SGS Thomson Microelectronics)



QUAD BTL DRIVER WITH VOLTAGE REGULATOR

4 BUILT-INPOWERBRIDGES(4 x 0.6A)
NO EXTERNAL COMPONENTS
SINGLEPOWERSUPPLY
WIDESUPPLY VOLTAGE RANGE (6 TO15V)
5V REGULATOR DRIVER FOR EXTERNAL

PASS TRANSISTOR WITH FOLD-BACK
SHORTCIRCUIT PROTECTION

ADJUSTABLE REGULATOR (2.0 TO 3.6V @
200mA) WITH SHORT CIRCUIT PROTEC­TION

TDA7473

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 singlesupply.

It’s specially dedicated to compact disc players

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
voltagefor the logic circuits.

Figure 1: Quad BTL PowerBridges + MultifunctionRegulators.

+

R1
1K

R2
1K

REG

ADJ

VSUP

VBG

REFERENCE

OC

VBG

VBG

5V

VS1 VS2

+

-

+

-

+

-

VS/2

VS/2

VS/2

VS3IN2 IN1DRIV

VS4

-

+

+

-

-

+

+

-

-

+

+

-

OUT 1+

OUT 1-

OUT 2+

OUT 2-

OUT 3+

OUT 3-

SPINDLE

M

MOTOR

SLEDGE

M

MOTOR

TRACKING

ACTUATOR

June 1998

IN3

ST_BY IN4

COMM

REF

-

+

VS/2

+

-

+

-

GND GND GND GND

OUT 4+

OUT 4-

D95AU223B

FOCUS

ACTUATOR

1/5

TDA7473

PIN CONNECTION (Topview)

5V

VSUP

OUT1-

VS1

OUT1+

GND
GND

ADJ

OUT2+ OUT3+

VS2

OUT2- OUT3-

ST_BY

REG

2
3
4
5
6
7
8
9
10
11
12
13

D95AU310A

28
27
26
25
24
23
22
21
20
19
18
17
16
1514

PIN FUNCTIONS

N. Pin Name Description

1 5V 5V regulated input
2 VSUP Positive power supply(battery)
3 OUT1- 1.st channel negative output
4 VS1 1.st channel power supply
5 OUT1+ 1.st channel positive output
6 OC Overcurrent sense input
7 GND Ground
8 GND Ground

9 ADJ Regulated voltage adjust input
10 OUT2+ 2.nd channel positive output
11 VS2 2.nd channel powersupply
12 OUT2_ 2.nd channel negativeoutput
13 ST_BY Stand_by
14 REG Regulated voltage output
15 COMM Common negative input
16 IN2 Positive input for the 2.nd channel
17 OUT3- 3.rd channel negative output
18 VS3 3.rd channel power supply
19 OUT3+ 3.rd channel positive output
20 IN3 Positive input for the 3.rd channel
21 GND Ground
22 GND Ground
23 IN4 Positive input for the 4.th channel
24 OUT4+ 4.th channel positive output
25 VS4 4.th channel power supply
26 OUT4- 4.th channel negative output
27 IN1 Positive input for the 1.st channel
28 DRIV Pass transistor driver

DRIV1
IN1
OUT4­VS4
OUT4+
IN4OC
GND
GND
IN3

VS3

IN2
COMM

2/5

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

SUP

V

S

T

OP

T

J

DC Supply Voltage 18 V
Channel Power Supply 6 V
Operating TemperatureRange -25 to 80 °C
Maximum Junction Temperature 150 °C

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

R

th j-pins

(*) with 6cm2of copper heatsink on board.

Thermal Resistance Junction to Ambient Max. 50 (*) °C/W
Thermal Resistance Junction to Pins Typ. 17 °C/W

TDA7473

ELECTRICALCHARACTERISTICS (@ V

SUP

= 6V, T

=25°C,unless otherwise specified.)

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

SUP

Supply Voltage 6 15 V
Maximum Power Dissipation (1) 1.5 W
Quiescent current (2) from V

S

Quiescent current (2) from 5V V
Quiescent current (2) from V

SUPVSUP

Stand-by current from 5V (pin1) V
Stand-by current from V

SUP

V

(pin4, 11,18, 25)
(pin1) = 5V, R2 = ∞ 1.8 2.5 mA

= 15V 1.3 2.5 mA
=6V 1 2 mA

V

SUP

= 5V, R2 =

(pin1)

V

= 15V 0.4 0.8 mA

SUP

= 6V 0.3 0.6 mA

V

SUP

=5V 20 35 mA

∞

1.2 2 mA

CHANNELS BTL

Peakoutput current for channels 0.6 A

V

SAT

VSATHIGH SIDE I = 0.6A;VS= 5V 1.3 1.6 A
VSATLOW SIDE I = 0.6A;V
Output voltageswingpeak-to-

V

= 5V, I

S

= 5V 0.7 0.9 A

S

= 0.6A 5.5 6 Vpp

out

peak
Voltage gain for channels 25.5 26.5 27.5 dB
Channels output offset voltage -180 -50 100 mV

VST-BY Channel St-By Threshold Active --> St-By 0.65V

St-By --> Active 0.50V

reg

0.75V

reg
reg

0.85V

reg

REGULATORS

5V Vpin 1 Iout = 0.2A 4.85 5.05 5.25 V

V

= 0.2A 1.2 1.3 V

out

50 100 mA

I

DRIV

Mindrop 5V -->REG I
Output currentfrom DRIV for

pass-transistor driving
Output current from DRIV in

20 50 80 mA

stand-by
DROP V

--> DRIV I

SUP

Threshold voltage for overcurr.
protection (VSUP - OC)

V

REG

Regulator Voltage R1, R2 = 1K

= 20mA 0.2 0.25 V

DRIV

= 6V 190 230 270 mV

V

SUP

= 12V 120 160 200 mV

V

SUP

= 15V 80 100 120 mV

V

SUP

Ω

2.45 2.53 2.65 V
Min REG voltage (settable) 1.8 2 V
Max REG voltage (settable) 3.6 3.8 V
Output current from REG in

R1, R2 = 1K

Ω

20 mA

Stand-by

(1) @ T
(2) INx = COMM; no loads on the regulatorsoutputs
(3) Device is active when St-By = Low

=70°C, on board 6cm2copper heatsink

amb

V
V

3/5

TDA7473

SO28 PACKAGEMECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.65 0.104

a1 0.1 0.3 0.004 0.012

b 0.35 0.49 0.014 0.019

b1 0.23 0.32 0.009 0.013

C 0.5 0.020

c1 45°(typ.)

D 17.7 18.1 0.697 0.713
E 10 10.65 0.394 0.419
e 1.27 0.050

e3 16.51 0.65

F 7.4 7.6 0.291 0.299
L 0.4 1.27 0.016 0.050

mm inch

S8

(max.)

°

4/5

TDA7473

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subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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