Philips TDA1561Q-N2, TDA1561Q-N1 Datasheet

DATA SH EET

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

1997 Aug 14

INTEGRATED CIRCUITS

TDA1561Q

2 × 23 W high efficiency car radio power amplifier

1997 Aug 14 2

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

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.

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.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage DC biased 6.0 14.4 18 V

non operating −−30 V load dump −−50 V

ORM

repetitive peak output current −−4A

q(tot)

total quiescent current RL= ∞−95 150 mA

stb

standby current − 150µA

Z

 input impedance − 60 − kΩ

output power RL = 4 Ω; EIAJ − 36 − W

THD 10% 21 23 − W

voltage gain 31 32 33 dB

CMRR common mode rejection ratio f = 1 kHz; R

=0Ω−80 − dB

SVRR supply voltage ripple rejection f = 1 kHz; R

=0Ω 45 55 − dB

∆V

 DC output offset voltage −−150 mV

channel separation Rs=0kΩ 40 60 − dB

∆G

 channel unbalance −−1dB

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

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

1997 Aug 14 3

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MLD214

REFERENCE

SOURCES

MUTE/STANDBY

THERMAL/

SHORT-CIRCUIT

PROTECTION

HIGHER

TEMPERATURE

BTL DISABLE

0.5V

MUTE

IN1

IN2

CIN

MODE

1/2R

GND1

GND2

OUT2

OUT1

TDA1561Q

1997 Aug 14 4

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

PINNING

SYMBOL PIN DESCRIPTION

IN1 1 input 1 HV

2 half supply voltage control input MODE 3 mute/standby/operating/SE-only 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 electrolytic capacitor for

single-ended (SE) mode CIN 12 common input IN2 13 input 2

Fig.2 Pin configuration.

handbook, halfpage

MLD215

1 2 3 4 5 6 7 8

9 10 11 12 13

TDA1561Q

IN1

GND1

OUT1

MODE

OUT1

OUT2

CIN

IN2

GND2

OUT2

1997 Aug 14 5

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

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.

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).

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

by means of a voltage buffer (see 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.

1997 Aug 14 6

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

LIMITING VALUES

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

THERMAL CHARACTERISTICS

Note

1. The value of R

th(c-h)

depends on the application (see Fig.3).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

supply voltage operating − 18 V

non operating − 30 V load dump; tr> 2.5 ms − 50 V

P(sc)

short-circuit safe voltage − 18 V

reverse polarity voltage − 6V

OSM

non-repetitive peak output current − 6A

ORM

repetitive peak output current − 4A

tot

total power dissipation − 60 W

stg

storage temperature −55 +150 °C

virtual junction temperature − 150 °C

amb

operating ambient temperature −40 −°C

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-c)

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

th(j-a)

thermal resistance from junction to ambient 40 K/W

1997 Aug 14 7

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

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

th(vj-c)

= 1.3 K/W and

th(c-h)

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

should be:

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

150 60–

25×

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

1.3– 0.2– 7.5 K/W=

1.7

150 60–

25×

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





1.3– 0.2– 13.8 K/W=

Fig.3 Thermal equivalent resistance network.

handbook, halfpage

3.6 K/W

0.6 K/W

3.6 K/W

virtual junction

OUT 1 OUT 1

case

3.6 K/W

0.6 K/W

3.6 K/W

OUT 2 OUT 2

MGC424

0.1 K/W

1997 Aug 14 8

Philips Semiconductors Preliminary speciﬁcation

2 × 23 W high efﬁciency car radio power ampliﬁer

TDA1561Q

DC CHARACTERISTICS

= 14.4 V; T

amb

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

Note

1. The circuit is DC biased at V

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

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

supply voltage note 1 6.0 14.4 18.0 V

quiescent current RL= ∞−95 150 mA

stb

standby current − 150µA

average electrolytic capacitor voltage at pin 11

− 7.1 − V

∆V

 DC output offset voltage on state −−150 mV

mute state −−50 mV Mode select switch (see Fig.4) V

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

Protection

dis

BTL disable temperature − 145 −°C

Fig.4 Switching levels of mode select switch.

handbook, halfpage

,,,,,

MLD216

SE Only

SE/BTL

Standby

Mute

+ 16 hidden pages