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TDA8542 Fiches technique(PDF) 4 Page - NXP Semiconductors |
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TDA8542 Fiches technique(HTML) 4 Page - NXP Semiconductors |
4 / 20 page 1998 Apr 01 4 Philips Semiconductors Product specification 2 × 1 W BTL audio amplifier TDA8542 PINNING SYMBOL PIN DESCRIPTION LGND 1 ground, left channel OUTL+ 2 positive loudspeaker terminal, left channel MODE 3 operating mode select (standby, mute, operating) SVR 4 half supply voltage, decoupling ripple rejection BTL/SE 5 BTL loudspeaker or SE headphone operation n.c. 6 not connected OUTR+ 7 positive loudspeaker terminal, right channel RGND 8 ground, right channel VCCR 9 supply voltage, right channel OUTR − 10 negative loudspeaker terminal, right channel INR − 11 negative input, right channel INR+ 12 positive input, right channel INL+ 13 positive input, left channel INL − 14 negative input, left channel OUTL − 15 negative loudspeaker terminal, left channel VCCL 16 supply voltage, left channel Fig.2 Pin configuration. handbook, halfpage TDA8542 MGB974 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 LGND OUTL + MODE SVR BTL/SE n.c. OUTR + RGND VCCR OUTR − INR − INR + INL + INL − OUTL − VCCL FUNCTIONAL DESCRIPTION The TDA8542(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 dB 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. Mode select pin The device 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. Headphone connection A headphone can be connected to the amplifier using two coupling capacitors for each channel. The common GND pin of the headphone is connected to the ground of the amplifier (see Fig.13). In this case the BTL/SE pin must be either on a logic HIGH level or not connected at all. The two coupling capacitors can be omitted if it is allowed to connect the common GND pin of the headphone jack not to ground, but to a voltage level of 1 ⁄2VCC (see Fig.13). In this case the BTL/SE pin must be either on a logic LOW level or connected to ground. If the BTL/SE pin is on a LOW level, the power amplifier for the positive loudspeaker terminal is always in mute condition. |
Numéro de pièce similaire - TDA8542 |
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Description similaire - TDA8542 |
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