Philips TDA8547 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA8547

2 × 1 W BTL audio amplifier with output channel switching

Preliminary speciﬁcation File under Integrated Circuits, IC01

1997 Oct 07

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output channel switching

FEATURES

• Selection between output channels

• Flexibility in use

• Few external components

• Low saturation voltage of output stage

• Gain can be fixed with external resistors

• Standby mode controlled by CMOS compatible levels

• Low standby current

• No switch-on/switch-off plops

• High supply voltage ripple rejection

• Protected against electrostatic discharge

• Outputs short-circuit safe to ground, V

load

• Thermally protected.

and across the

TDA8547

APPLICATIONS

• Telecommunication equipment

• Portable consumer products

• Personal computers

• Motor-driver (servo).

GENERAL DESCRIPTION

The TDA8547(T) is a two channel audio power amplifier for an output power of 2 × 1 W with an 8 Ω load at a 5 V supply. The circuit contains two BTL amplifiers with a complementary PNP-NPN output stage and standby/mute logic. The operating condition of all channels of the device (standby, mute or on) is externally controlled by the MODE pin. With the SELECT pin one of the output channels can be switched in the standby condition. This feature can be used for loudspeaker selection and also reduces the quiescent current consumption. The TDA8547T comes in a SO16 package and the TDA8547 in a DIP16 package.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

stb

THD total harmonic distortion P

supply voltage 2.2 5 18 V quiescent current VCC= 5 V; 2 channels − 15 22 mA

= 5 V; 1 channel − 812mA

standby current −−10 µA output power THD = 10%; RL=8Ω; VCC=5V 1 −−W

= 0.5 W − 0.15 − %

SVRR supply voltage ripple rejection 50 −−dB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8547T SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162-1 TDA8547 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1

1997 Oct 07 2

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output channel switching

BLOCK DIAGRAM

handbook, full pagewidth

−

− +

CC1

20 kΩ

IN1− IN1+

14 13

TDA8547

CC1

CC2

OUT1−

−

− +

OUT1+

IN2− IN2+

SVRR

MODE

SELECT

20 kΩ

STANDBY/MUTE LOGIC

TDA8547

−

− +

GND1

GND2

OUT2−

OUT2+

MGK697

11 12

3 5

− +

CC2

20 kΩ

STANDBY/MUTE LOGIC

−

Fig.1 Block diagram.

1997 Oct 07 3

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output channel switching

PINNING

SYMBOL PIN DESCRIPTION

GND1 1 ground, channel 1 OUT1+ 2 positive loudspeaker terminal,

channel 1

MODE 3 operating mode select (standby,

mute, operating)

SVRR 4 half supply voltage, decoupling

ripple rejection

SELECT 5 input for selection of operating

channel n.c. 6 not connected OUT2+ 7 positive loudspeaker terminal,

channel 2 GND2 8 ground, channel 2 V

CC2

OUT2− 10 negative loudspeaker terminal,

IN2− 11 negative input, channel 2 IN2+ 12 positive input, channel 2 IN1+ 13 positive input, channel 1 IN1− 14 negative input, channel 1 OUT1− 15 negative loudspeaker terminal,

CC1

9 supply voltage, channel 2

channel 2

channel 1

16 supply voltage, channel 1

handbook, halfpage

GND1

OUT1+

SELECT

OUT2+

MODE

SVRR

n.c.

GND2

2 3 4 5 6 7 8

TDA8547

MGK696

Fig.2 Pin configuration.

TDA8547

CC1

OUT1−

IN1−

IN1+

IN2+

IN2−

OUT2−

CC2

FUNCTIONAL DESCRIPTION

The TDA8547(T) is a 2 × 1 W BTL audio power amplifier capable of delivering 2 × 1 W output power to an 8 Ω load at THD = 10% using a 5 V power supply. Using the MODE pin the device can be switched to standby and mute condition. The device is protected by an internal thermal shutdown protection mechanism. The gain can be set within a range from 6 to 30 dB by external feedback resistors.

Power ampliﬁer

The power amplifier is a Bridge-Tied Load (BTL) amplifier with a complementary PNP-NPN output stage. The voltage loss on the positive supply line is the saturation voltage of a PNP power transistor, on the negative side the saturation voltage of a NPN power transistor. The total voltage loss is <1 V and with a 5 V supply voltage and an 8 Ω loudspeaker an output power of 1 W can be delivered.

1997 Oct 07 4

MODE pin

The whole device (both channels) is in the standby mode (with a very low current consumption) if the voltage at the MODE pin is >(VCC− 0.5 V), or if this pin is floating. At a MODE voltage level of less than 0.5 V the amplifier is fully operational. In the range between 1.5 V and VCC− 1.5 V the amplifier is in mute condition. The mute condition is useful to suppress plop noise at the output caused by charging of the input capacitor.

SELECT pin

If the voltage at the SELECT pin is in the range between

1.5 V and V

− 1.5 V, or if it is kept floating, then both

channels can be operational. If the SELECT pin is set to a LOW voltage or grounded, then only channel 2 can operate and the power amplifier of channel 1 will be in the standby mode. In this case only the loudspeaker at channel 2 can operate and the loudspeaker at channel 1 will be switched off. If the SELECT pin is set to a HIGH level or connected to VCC, then only channel 1 can

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output channel switching

operate and the power amplifier of channel 2 will be in the standby mode. In this case only the loudspeaker at channel 1 can operate and the loudspeaker at channel 2 will be switched off. Setting the SELECT pin to a LOW or a HIGH voltage results in a reduction of quiescent current consumption by a factor of approximately 2.

Switching with the SELECT pin during operating is not plop-free, because the input capacitor of the channel which is coming out of standby needs to be charged first.

Table 1 Control pins MODE and SELECT versus status of output channels Voltage levels at control pins at V

= 5 V; for other supply voltages see Figs. 14 and 15.

CONTROL PIN STATUS OF OUTPUT CHANNEL

MODE SELECT CHANNEL 1 CHANNEL 2

(1)

HIGH

HVP HVP HVP

HVP

LOW

(4)

/LOW

(4)

/LOW

(4)

/LOW

/NC

(4)

(5)

(2)

(5) (5) (5)

HVP HVP

HIGH

HVP

(4) (4)

(4)

LOW

(3)

/NC /NC

(1)

/NC

(5)

For plop-free channel selecting the device has first to be set in mute condition with the MODE pin (between 1.5 V and VCC− 1.5 V), then set the SELECT pin to the new level, after a delay set the MODE pin to a LOW level. The delay needed depends on the values of the input capacitor and the feedback resistors. Time needed is approx. 10 × C1 × (R1 + R2), so approximately 0.6 s. for the values in Fig.4.

standby standby 0

(2) (2)

mute/on standby 8

(2)

mute/on mute/on 15 standby mute/on 8

TDA8547

TYP. I

(mA)

mute mute 15

on on 15

Notes

1. HIGH = V

pin>VCC

− 0.5 V.

2. NC = not connected or floating.

3. X = don’t care.

4. HVP = 1.5 V < V

5. LOW = V

< 0.5 V.

pin<VCC

− 1.5 V.

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

ORM

stg

amb

Psc

tot

supply voltage operating −0.3 +18 V input voltage −0.3 VCC+ 0.3 V repetitive peak output current − 1A storage temperature −55 +150 °C operating ambient temperature −40 +85 °C AC and DC short-circuit safe voltage − 10 V total power dissipation SO16 − 1.2 W

DIP16 − 2.2 W

QUALITY SPECIFICATION

In accordance with

Handbook”

. The handbook can be ordered using the code 9397 750 00192.

“SNW-FQ-611-E”

. The number of the quality specification can be found in the

1997 Oct 07 5

“Quality Reference

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output

TDA8547

channel switching

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-a)

thermal resistance from junction to ambient in free air

TDA8547T (SO16) 100 K/W TDA8547 (DIP16) 55 K/W

2.5

handbook, halfpage

(W)

2.0

1.5

1.0

DIP16

SO16

MGK698

0.5

0 40 80 160

120

amb

(°C)

Fig.3 Power derating curve.

Table 2 Maximum ambient temperature at different conditions

CONTINUOUS SINE WAVE DRIVEN

(V)

(Ω)

APPLICATION

OPERATION

MODE

(W)

(1)

max

amb(max)

(°C)

(W)

SO16 DIP16

5 8 2 channels BTL 2 × 1.2 1.4 − 73 5 8 1 channel BTL 1.2 0.7 80 112

7.5 8 2 channels BTL 2 × 2.4 3.0 −−

7.5 8 1 channel BTL 2.4 1.5 − 68

7.5 16 2 channels BTL 2 × 1.2 1.8 − 50

7.5 16 1 channel BTL 1.2 0.9 60 100

7.5 28 2 channels BTL 2 × 1 1.0 50 95

7.5 28 1 channel BTL 1 0.5 100 122

Note

1. At THD = 10%.

1997 Oct 07 6

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output

TDA8547

channel switching

DC CHARACTERISTICS

=5V; T

otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

stb

OUT+

, I

IN−

MODE

SELECT

− V

V

IN+

MODE

SELECT

=25°C; RL=8Ω; V

amb

supply voltage operating 2.2 5 18 V quiescent current BTL 2 channels;

standby current V DC output voltage note 2 − 2.2 − V

 differential output voltage

OUT−

offset input bias current −−500 nA input voltage MODE pin operating 0 − 0.5 V

input current MODE pin 0 V < V input voltage SELECT pin channel 1 = standby;

input current SELECT pin V

= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4; unless

MODE

− 15 22 mA

note 1 BTL 1 channel;

− 812mA

note 1

MODE=VCC

−−10 µA

−−50 mV

mute 1.5 − V standby V

MODE<VCC

− 0.5 − V

−−20 µA

CC CC

0 − 1V

channel 2 = on channel 1 = on;

− 1 − V

channel 2 = standby

=0V −−100 µA

SELECT

− 1.5 V V

Notes

1. Measured with R

= ∞. With a load connected at the outputs the quiescent current will increase, the maximum of this

increase being equal to the DC output offset voltage divided by RL.

2. The DC output voltage with respect to ground is approximately 0.5VCC.

1997 Oct 07 7

Philips Semiconductors Preliminary speciﬁcation

2 × 1 W BTL audio ampliﬁer with output

TDA8547

channel switching

AC CHARACTERISTICS

=5V; T

unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

THD total harmonic distortion Po= 0.5 W − 0.15 0.3 % G

SVRR supply voltage ripple rejection note 3 50 −−dB

Notes

1. Gain of the amplifier is in BTL application circuit Fig.4.

2. The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a source impedance of R

3. Supply voltage ripple rejection is measured at the output, with a source impedance of RS=0Ω at the input. The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is applied to the positive supply rail.

4. Supply voltage ripple rejection is measured at the output, with a source impedance of RS=0Ω at the input. The ripple voltage is a sine wave with a frequency between 100 Hz and 20 kHz and an amplitude of 100 mV (RMS), which is applied to the positive supply rail.

5. Output voltage in mute position is measured with a 1 V (RMS) input voltage in a bandwidth of 20 Hz to 20 kHz, so including noise.

6. Channel separation is measured at the output with a source impedance of RS=0Ω at the input and a frequency of 1 kHz. The output power in the operating channel is set to 0.5 W.

=25°C; RL=8Ω; f = 1 kHz; V

amb

= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4;

MODE

output power THD = 10% 1 1.2 − W

THD = 0.5% 0.6 0.9 − W

closed loop voltage gain note 1 6 − 30 dB differential input impedance − 100 − kΩ noise output voltage note 2 −−100 µV

note 4 40 −−dB output voltage note 5 −−200 µV channel separation V

------- R1

=0Ω at the input.

= 0.5VCC; note 6 40 −−dB

SELECT

1997 Oct 07 8

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