TDA1564 datasheet(7/30 Pages) PHILIPS

7 / 30 page

2004 Jan 27

Philips Semiconductors

Preliminary speciﬁcation

High efﬁciency 2

× 25 W/4 Ω

stereo car radio power ampliﬁer

TDA1564

loudspeaker, the output stage will be repeatedly switched

on and off. The duty cycle in the ‘on’ condition is low

enough to prevent excessive dissipation.

The device also has two independent DC offset detection

circuits that can detect DC output voltages across the

speakers. With a DC offset greater than 2 V, a warning is

given on the diagnostic pin. There will be no internal

shutdown with DC offsets.

When the supply voltage drops below 6 V (e.g. engine

start), the circuit mutes immediately, avoiding clicks from

the electronic circuit preceding the power amplifier.

The voltage of the SE electrolytic capacitor (pin 4) is kept

at 0.5VP by means of a voltage buffer (see Fig.2). The

value of this capacitor has an important influence on the

output power in SE mode, especially at low signal

frequencies. A high value is recommended to minimize

dissipation at low frequencies.

The diagnostic output is an open-collector output and

requires a pull-up resistor. It gives the following outputs:

• Clip detection at THD = 2.5 %

• Short-circuit protection:

– When a short-circuit occurs (for at least 10 ms) at the

outputs to ground or the supply voltage, the output

stages are switched off to prevent excessive

dissipation; the outputs are switched on again

approximately 500 ms after the short-circuit is

removed, during this short-circuit condition the

protection pin is LOW

– When a short-circuit occurs across the load (for at

least 10 ms), the output stages are switched off for

approximately 500 ms; after this time, a check is

made to see whether the short-circuit is still present

– The power dissipation in any short-circuit condition is

very low.

• During start-up/shutdown, when the product is internally

muted

• Temperature prewarning:

– A prewarning (junction temperature > 145

°C)

indicates that the temperature protection will become

active. The prewarning can be used to reduce the

input signal and thus reduce the power dissipation.

• Offset detection:

– One of the channels has a DC output voltage greater

than 2 V.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

THERMAL CHARACTERISTICS

Note

1. The value of Rth(c-h) depends on the application (see Fig.5).

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

operating

−

non-operating

−

load dump; tr > 2.5 ms

−

VP(sc)

short-circuit safe voltage

−

Vrp

reverse polarity voltage

−

IORM

repetitive peak output current

−

Ptot

total power dissipation

−

Tstg

storage temperature

−55

+150

°C

Tvj

virtual junction temperature

−

150

°C

Tamb

ambient temperature

−40

+85

°C

SYMBOL

PARAMETER

CONDITIONS

VALUE

UNIT

Rth(j-c)

thermal resistance from junction to case

note 1

1.3

K/W

Rth(j-a)

thermal resistance from junction to ambient

in free air

K/W

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