TDA7072AT datasheet(4/10 Pages) PHILIPS

4 / 10 page

July 1994

Philips Semiconductors

Objective speciﬁcation

Single BTL power driver

TDA7072A/AT

FUNCTIONAL DESCRIPTION

The TDA7072A/AT are single power driver circuits in a

BTL configuration, intended for use as a power driver for

servo systems with a single supply. They are particular

designed for compact disc players and are capable of

driving focus, tracking, sled functions and spindle motors.

Because of the BTL configuration, the devices can supply

a bi-directional DC current in the load, with only a single

supply voltage. The voltage gain is fixed by internal

feedback at 33.5 dB and the devices operate in a wide

supply voltage range (3 to 18 V). The devices can supply

a maximum output current of 0.6 A. The outputs can be

short-circuited over the load, to the supply and to ground

at all input conditions. The differential inputs can handle

common mode input voltages from ground level up to

(VP −2.2 V). The devices have a very high slew rate. Due

to the large bandwidth, they can handle PWM signals up

to 176 kHz.

LIMITING VALUES

In accordance with the Absolute Maximum System (IEC 134.

Note to the limiting values

The outputs can be short-circuited over the load, to the supply and to ground at all input conditions.

THERMAL RESISTANCE

Note to the thermal resistance

TDA7072A: VP = 5 V; RL = 8 Ω; The typical voltage swing = 5.8 V and Vloss is 2.1 V therefore IO = 0.36 A and

Ptot = 0.76 W; Tamb (max) = 150 − 0.76 × 100 = 74 °C

TDA7072AT: VP = 5 V; RL = 16 typical voltage swing = 5.8 V and Vloss is 2.1 V therefore IO = 0.18 A and Ptot = 0.38 W;

Tamb (max) = 150 − 0.38 × 155 = 91 °C

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

positive supply voltage range

−

IORM

repetitive peak output current

−

IOSM

non repetitive peak output current

−

1.5

Ptot

total power dissipation

Tamb < 25 °C

TDA7072A

−

1.25

TDA7072AT

−

0.54

Tstg

storage temperature range

−55

+150

°C

Tvj

virtual junction temperature

−

+150

°C

Tsc

short-circuit time

see note

−

1hr

SYMBOL

PARAMETER

THERMAL RESISTANCE

Rth j-a

from junction to ambient in free air

TDA7072A

100 K/W

TDA7072AT

155 K/W

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