Philips TDA1561Q User Manual

INTEGRATED CIRCUITS

DATA SH EET

TDA1561Q

2 × 23 W high efficiency car radio power amplifier

Preliminary speciﬁcation Supersedes data of 1997 Jun 11 File under Integrated Circuits, IC01

1997 Aug 14

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power

TDA1561Q

ampliﬁer

FEA TURES

• Low dissipation due to switching from Single-Ended (SE) to Bridge-Tied Load (BTL) mode

• High Common Mode Rejection Ratio (CMRR)

• Mute/standby/operating/SE-only (mode select pin)

• Zero crossing mute and standby circuit

• Load dump protection circuit

• Short-circuit safe to ground, to supply voltage and

across load

• Loudspeaker protection circuit

• Device switches to single-ended operation at excessive

junction temperatures.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

ORM

q(tot)

stb

 input impedance − 60 − kΩ

Z

supply voltage DC biased 6.0 14.4 18 V

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

output power RL = 4 Ω; EIAJ − 36 − W

voltage gain 31 32 33 dB CMRR common mode rejection ratio f = 1 kHz; R SVRR supply voltage ripple rejection f = 1 kHz; R

∆V

 DC output offset voltage −−150 mV

∆G

 channel unbalance −−1dB

channel separation Rs=0kΩ 40 60 − dB

GENERAL DESCRIPTION

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

non operating −−30 V load dump −−50 V

THD 10% 21 23 − W

=0Ω−80 − dB

=0Ω 45 55 − dB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

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

1997 Aug 14 2

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

BLOCK DIAGRAM

1/2R

MUTE

REFERENCE

SOURCES

MUTE/STANDBY

THERMAL/

SHORT-CIRCUIT

PROTECTION

MUTE

handbook, full pagewidth

IN1

CIN

IN2

MODE

HIGHER

TEMPERATURE

BTL DISABLE

0.5V

TDA1561Q

OUT1

OUT2

GND1

GND2

Fig.1 Block diagram.

1997 Aug 14 3

MLD214

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

PINNING

SYMBOL PIN DESCRIPTION

IN1 1 input 1 HV

MODE 3 mute/standby/operating/SE-only GND1 4 ground 1 OUT1 5 inverting output 1 OUT1 6 non-inverting output 1 V

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

CIN 12 common input IN2 13 input 2

2 half supply voltage control input

7 supply voltage

11 electrolytic capacitor for

single-ended (SE) mode

handbook, halfpage

IN1

MODE

GND1

OUT1 OUT1

OUT2

GND2

CIN

1 2 3 4 5 6

TDA1561Q

7 8

9 10 11 12

TDA1561Q

IN2

MLD215

Fig.2 Pin configuration.

1997 Aug 14 4

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

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 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 TDA1561Q (see Fig.9).

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. Under the assumption 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 Fig.10).

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 145 °C. In this case the output power is limited to 5 W per ampliﬁer.

TDA1561Q

The device is fully protected against short-circuiting of the output pins to ground and to the supply voltage. It is also protected against short-circuiting the loudspeaker and 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 a low dissipation. With permanent short-circuiting of the 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.

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

The voltage of the SE electrolytic capacitor (pin 11) is always kept at 0.5V Fig.1). 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.

by means of a voltage buffer (see

The gain of each amplifier is internally fixed at 32 dB. With the MODE pin, the device can be switched to the following modes:

• Standby with low standby current (<50 µA)

• Mute condition, DC adjusted

• On, operation

• SE-only, operation (BTL disabled).

1997 Aug 14 5

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power

TDA1561Q

ampliﬁer

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

P(sc)

OSM

ORM

tot

stg

amb

THERMAL CHARACTERISTICS

supply voltage operating − 18 V

non operating − 30 V

load dump; tr> 2.5 ms − 50 V short-circuit safe voltage − 18 V reverse polarity voltage − 6V non-repetitive peak output current − 6A repetitive peak output current − 4A total power dissipation − 60 W storage temperature −55 +150 °C virtual junction temperature − 150 °C operating ambient temperature −40 −°C

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R R

th(j-c) th(j-a)

thermal resistance from junction to case see note 1 1.3 K/W thermal resistance from junction to ambient 40 K/W

Note

1. The value of R

depends on the application (see Fig.3).

th(c-h)

1997 Aug 14 6

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

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 which the amplifier must still deliver its full power in the BTL mode.

With a conventional BTL ampliﬁer, the maximum power dissipation with a music-like signal (at each ampliﬁer) will be approximately two times 5 W. At a virtual junction temperature of 150 °C and a maximum ambient temperature of 60 °C, R

= 0.2 K/W, the thermal resistance of the heatsink

th(c-h)

should be:

150 60–

---------------------25×

1.3– 0.2– 7.5 K/W=

Compared to a conventional BTL ampliﬁer, the TDA1561Q has a higher efﬁciency. The thermal resistance of the heatsink should be:

150 60–



1.7

----------------------



25×

1.3– 0.2– 13.8 K/W=

= 1.3 K/W and

th(vj-c)

TDA1561Q

handbook, halfpage

OUT 1 OUT 1

3.6 K/W

0.6 K/W

Fig.3 Thermal equivalent resistance network.

virtual junction

OUT 2 OUT 2

3.6 K/W

0.6 K/W

0.1 K/W

case

3.6 K/W

MGC424

1997 Aug 14 7

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power

TDA1561Q

ampliﬁer

DC CHARACTERISTICS

= 14.4 V; T

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

stb

∆V

 DC output offset voltage on state −−150 mV

Mode select switch (see Fig.4) V

Protection

dis

=25°C; measured in Fig.6; unless otherwise speciﬁed.

amb

supply voltage note 1 6.0 14.4 18.0 V quiescent current RL= ∞−95 150 mA standby current − 150µA average electrolytic capacitor

− 7.1 − V

voltage at pin 11

mute state −−50 mV

voltage at mode select pin (pin 3)

standby condition 0 − 1V mute condition 2 − 3V on condition (SE/BTL mode) 4 − 5.5 V on condition (SE mode only) 7.5 − V

switch current through pin 3 Vms=5V −−40 µA

BTL disable temperature − 145 −°C

Note

1. The circuit is DC biased at V

handbook, halfpage

SE Only

8 7 6 5 4 3 2 1

,,,,,

SE/BTL

Mute

Standby

= 6 to 18 V and AC operating at VP=8to18V.

MLD216

Fig.4 Switching levels of mode select switch.

1997 Aug 14 8

+ 16 hidden pages