TDA1564 datasheet(6/30 Pages) PHILIPS

6 / 30 page

2004 Jan 27

Philips Semiconductors

Preliminary speciﬁcation

High efﬁciency 2

× 25 W/4 Ω

stereo car radio power ampliﬁer

TDA1564

TDA1564TH

VP1

n.c.

CIN

MODE

IN1

−

OUT1

−

IN1

OUT1

CSE

GND1

DIAG

GND2

IN2

OUT2

−

IN2

−

OUT2

OC1

OC2

VP2

n.c.

001aaa307

Fig.3 Pin configuration (TDA1564TH).

handbook, halfpage

TDA1564J

MGW245

IN1

−

CIN

CSE

VP1

MODE

OUT1

−

OUT1

GND

OUT2

−

OUT2

OC2

VP2

OC1

DIAG

IN2

−

IN2

Fig.4 Pin configuration (TDA1564J).

FUNCTIONAL DESCRIPTION

The TDA1564 contains two identical amplifiers with

differential inputs. At low output power [up to output

amplitudes of 3 V (RMS) at VP = 14.4 V], the device

operates as a normal SE amplifier. When a larger output

voltage swing is needed, the circuit switches internally to

BTL operation.

With a sine wave input signal, the dissipation of a

conventional BTL amplifier (up to 2 W output power) is

more than twice the dissipation of the TDA1564 (see

Fig.12).

In normal use, when the amplifier is driven with music-like

signals, the high (BTL) output power is only needed for a

small percentage of time. Assuming that a music signal

has a normal (Gaussian) amplitude distribution, the

dissipation of a conventional BTL amplifier with the same

output power is approximately 70 % higher (see Figs 13

and 14.

The heatsink has to be designed for use with music

signals. With such a heatsink, the thermal protection will

disable the BTL mode when the junction temperature

exceeds 150

°C. In this case, the output power is limited to

5 W per amplifier.

The gain of each amplifier is internally fixed at 26 dB. The

device can be switched to the following modes via the

MODE pin:

• Standby with low standby current (< 50 µA)

• Mute condition, DC adjusted

• On, operation.

The device is fully protected against a short-circuit of the

output pins to ground and to the supply voltage. It is also

protected against a short-circuit of the loudspeaker and

against high junction temperatures. In the event of a

permanent short-circuit condition to ground or the supply

voltage, the output stage will be switched off, causing low

dissipation. With a permanent short-circuit of the

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