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INTEGRATED CIRCUITS
DATA SHEET
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, VCC and across the load • Thermally protected. GENERAL DESCRIPTION APPLICATIONS • Telecommunication equipment • Portable consumer products • Personal computers • Motor-driver (servo).
TDA8547
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 VCC Iq Istb Po THD SVRR PARAMETER supply voltage quiescent current standby current output power total harmonic distortion supply voltage ripple rejection THD = 10%; RL = 8 Ω; VCC = 5 V Po = 0.5 W VCC = 5 V; 2 channels VCC = 5 V; 1 channel CONDITIONS MIN. 2.2 − − − 1 − 50 TYP. 5 15 8 − − 0.15 − MAX. 18 22 12 10 − − − UNIT V mA mA µA W % dB
ORDERING INFORMATION TYPE NUMBER TDA8547T TDA8547 PACKAGE NAME SO16 DIP16 DESCRIPTION plastic small outline package; 16 leads; body width 7.5 mm plastic dual in-line package; 16 leads (300 mil); long body VERSION SOT162-1 SOT38-1
1997 Oct 07
2
Philips Semiconductors
Preliminary specification
2 × 1 W BTL audio amplifier with output channel switching
BLOCK DIAGRAM
TDA8547
handbook, full pagewidth
VCC1 VCC2 16 9
−
IN1− IN1+ 14 13
− +
R VCC1 R
15
OUT1−
20 kΩ
− − +
2
OUT1+
20 kΩ
STANDBY/MUTE LOGIC
−
IN2− IN2+ 11 12
TDA8547
10 OUT2−
− +
R VCC2 R
20 kΩ 4 20 kΩ 3 5
− − +
7
OUT2+
SVRR
MODE SELECT
STANDBY/MUTE LOGIC 1 GND1 8 GND2
MGK697
Fig.1 Block diagram.
1997 Oct 07
3
Philips Semiconductors
Preliminary specification
2 × 1 W BTL audio amplifier with output channel switching
PINNING SYMBOL GND1 OUT1+ MODE SVRR SELECT n.c. OUT2+ GND2 VCC2 OUT2− IN2− IN2+ IN1+ IN1− OUT1− VCC1 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DESCRIPTION ground, channel 1 positive loudspeaker terminal, channel 1 operating mode select (standby, mute, operating) half supply voltage, decoupling ripple rejection input for selection of operating channel not connected positive loudspeaker terminal, channel 2 ground, channel 2 supply voltage, channel 2 negative loudspeaker terminal, channel 2 negative input, channel 2 positive input, channel 2 positive input, channel 1 negative input, channel 1 negative loudspeaker terminal, channel 1 supply voltage, channel 1 MODE pin Fig.2 Pin configuration.
TDA8547
handbook, halfpage
GND1 1 OUT1+ 2 MODE 3 SVRR 4
16 VCC1 15 OUT1− 14 IN1− 13 IN1+
TDA8547
SELECT 5 n.c. 6 OUT2+ 7 GND2 8
MGK696
12 IN2+ 11 IN2− 10 OUT2− 9 VCC2
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.
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 VCC − 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.