Philips tda1561q DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA1561Q

2 × 23 W car radio power amplifier

Preliminary speciﬁcation Supersedes data of September 1991 File under Integrated Circuits, IC01

Philips Semiconductors

1995 May 08

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W car radio power ampliﬁer TDA1561Q

FEATURES

• Low power dissipation due to switching from SE to BTL mode

• High common-mode rejection ratio (CMRR)

• Mute/standby/BTL-disable switch (mode select pin)

• Zero-crossing mute

• Load dump protection

GENERAL DESCRIPTION

The TDA1561Q is a monolithic power amplifier in a 13-lead plastic DIL-bent-SIL power package (DBS13P). It contains two identical 23 W amplifiers. The power dissipation is minimized by switching from single-ended (SE) to bridge-tied load (BTL) mode, when a higher output voltage swing is required. The device is primarily developed for car radio applications.

• Short-circuit safe to ground, VP and across load

• Loudspeaker protection

• Switches to single-ended operation at excessive crystal

temperature.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage DC biased 6.0 14.4 18 V

non-operating −−30 V load dump protected −−50 V

ORM

q(tot)

stb

 input impedance − 60 − kΩ

Z

CMRR common mode rejection ratio f SVRR supply voltage ripple rejection f

∆V

 DC output offset voltage −−150 mV

 channel unbalance −−1dB

∆G

repetitive peak output current −−4A total quiescent current − 95 150 mA standby current − 150µA

output power RL=4Ω; THD = 10% 21 23 − W closed loop voltage gain 31 32 33 dB

= 1 kHz; RS=0Ω− 80 − dB

= 1 kHz; RS=0Ω 45 55 − dB

channel separation RS=0kΩ 40 −−dB

ORDERING INFORMATION

TYPE NUMBER

TDA1561Q DBS13P plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) SOT141-6

1995 May 08 2

PACKAGE

NAME DESCRIPTION VERSION

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W car radio power ampliﬁer TDA1561Q

BLOCK DIAGRAM

MUTE

IN1

CIN

MODE

IN2

1/2R

GND1

REFERENCE

SOURCES

MUTE/STANDBY

GND2

THERMAL/

SHORT-CIRCUIT

PROTECTION

MUTE

HIGHER

TEMPERATURE

BTL DISABLE

0.5V

TDA1561Q

MLD214

OUT1

OUT2

Fig.1 Block diagram.

1995 May 08 3

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W car radio power ampliﬁer TDA1561Q

PINNING

SYMBOL PIN DESCRIPTION

IN1 1 input 1 HV

2 half supply voltage control input

MODE 3 mute/standby/BTL-disable mode

select switch input GND1 4 ground 1 OUT1 5 inverting output 1 OUT1 6 non-inverting output 1 V

7 supply voltage OUT2 8 inverting output 2 OUT2 9 non-inverting output 2 GND2 10 ground 2 C

11 single-ended electrolytic output CIN 12 common input IN2 13 input 2

handbook, halfpage

IN1

MODE

GND1

4 5

OUT1 OUT1

OUT2

GND2

CIN

IN2

TDA1561Q

7 8

9 10 11 12 13

MLD215

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA1561Q 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 single-ended (SE) amplifier. When a larger output voltage swing is required, the circuit switches internally to bridge-tied load (BTL) operation.

With a sine wave input signal the power dissipation of the TDA1561Q is approximately 50% lower than a conventional BTL amplifier at 2 W output power (see Fig.3).

In normal use, when the amplifier is driven with music signals, the high (BTL) output power is only required for a small percentage of time. Assuming a music signal

= 1.6 W) has a normal (Gaussian) amplitude

distribution, the reduction in dissipation is approximately 40% when compared to a BTL amplifier with the same output power (see Fig.4). The heatsink should be designed for use with music signals. With such a heatsink, the thermal protection disables the BTL mode when the crystal temperature exceeds 145 °C. In this event the output power is limited to 5 W per ampliﬁer when driven with a worst case sine wave input signal.

The gain of each amplifier is internally fixed at 32 dB. With the mode select input the device can be switched to the following modes:

• Low standby current (<50 µA)

• Mute condition, DC adjusted

• On operation

• SE only operation (BTL disabled).

The device is fully protected against short-circuiting of the outputs to ground and to V

. It is also protected against

short-circuiting the loudspeaker and high crystal temperatures. In the event of a permanent short-circuit to ground or VP, the output stage will be switched off causing a low dissipation. With permanent short-circuiting of the loudspeaker, the output stage will repeatedly be switched on and off. The duty cycle in the on condition is low enough to prevent excessive dissipation (duty cycle is approximately 0.1%).

1995 May 08 4

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W car radio power ampliﬁer TDA1561Q

To avoid plops during switching from mute to on or from on to mute/standby, a built-in zero-cross detector only allows switching at zero input voltage. However, when VP drops below 6 V (e.g. engine start), the circuit mutes immediately to avoid clicks coming from electronic circuitry preceding the power amplifier.

diss

(W)

024 810

(1)

(2)

(3)

MGC425

P (W)

The voltage of the SE electrolytic capacitor is always kept to 0.5VP by a voltage buffer (see Fig.1). The value of the SE electrolytic capacitor has an important influence on the output power in SE mode, especially at low signal frequencies, a high value is then recommended to minimize dissipation.

diss

(W)

010

2468

(1)

(2)

(3)

MGC426

P (W)

(1) For conventional amplifier BTL. (2) For TDA1561Q. (3) For conventional amplifier SE.

Fig.3 Sine wave signal; P

diss

= f (Po).

(1) For conventional amplifier BTL. (2) For TDA1561Q. (3) For conventional amplifier SE.

Fig.4 Pink noise with IEC-268 filter; P

diss

= f (Po).

1995 May 08 5

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W car radio power ampliﬁer TDA1561Q

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

P(sc)

P(r)

OSM

ORM

tot

stg

amb

supply voltage operating − 18 V

non-operating − 30 V load dump protection; t

≥ 2.5 ms − 50 V

AC and DC short-circuit safe voltage − 18 V reverse polarity − 6V non-repetitive peak output current − 6A repetitive peak output current − 4A total power dissipation − 60 W storage temperature −55 +150 °C operating ambient temperature −40 +150 °C crystal temperature − 150 °C

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R R

th j-a th j-c

thermal resistance from junction to ambient in free air 40 K/W thermal resistance from junction to case 1.3 K/W

which the amplifier must still deliver its full power in the

handbook, halfpage

OUT 1 OUT 1

virtual junction

OUT 2 OUT 2

BTL mode.

IRTUAL JUNCTION TEMPERATURE

V With a conventional BTL ampliﬁer, the maximum power

3.6 K/W

0.6 K/W

3.6 K/W

0.6 K/W

0.1 K/W

case

3.6 K/W

MGC424

Fig.5 Equivalent thermal resistance network.

dissipation with a 4 Ω load and driven with a music signal (at each ampliﬁer) will be approximately 2 × 6 W. At a virtual junction temperature of 150 °C and T 60 °C, R of R

th c-hs

= 1.3 K/W and R

th vj-c

= 0.2 K/W (the value

th c-hs

depends on the application), the thermal

amb(max)

resistance of the heatsink should be:

150 60–

---------------------26×

AXIMUM FULL-POWER TEMPERATURE

1.3 0.2 6 K/W=––

However the TDA1561Q has a higher efficiency. The thermal resistance of the heatsink should be:

145 60–

---------------------26×

× 1.3– 0.2– 10.3 K/W=

------- -

0.6

Heatsink design

There are two parameters that determine the size of the heatsink. The first is the rating for the virtual junction temperature and the second is the ambient temperature at

1995 May 08 6

145 °C is the temperature at which BTL will be disabled.

: coefficient because of 40% higher efficiency.

------- -

0.6

+ 14 hidden pages