1W BTL Audio Amplifier


Posted on Feb 5, 2014

The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here combines the functional diagram of the TDA8551 with its typical application circuit. The gain o


1W BTL Audio Amplifier
Click here to download the full size of the above Circuit.

f the amplifier can be set by the digital volume control input. At the highest volume setting, the gain is 20 dB. Using the MODE pin the device can be switched to one of three modes: standby (MODE level between Vp and Vp 0. 5 V), muted (MODE level between 1 V and Vp 1. 4 V) or normal (MODE level less than 0. 5 V). The TDA8551 is protected by an internal thermal shutdown protection mechanism. The total voltage loss for both MOS transistors in the complementary output stage is less than 1 V. Using a 5-V supply and an 8-W loudspeaker, an output power of 1 watt can be delivered. The volume control has an attenuation range of between 0 dB and 80 dB in 64 steps set by the 3-state level at the UP/DOWN pin: floating: volume remains unchanged; negative pulses: decrease volume; positive pulses: increase volume Each pulse at he Up/DOWN pin causes a change in gain of 80/64 = 1. 25 dB (typical value). When the supply voltage is first connected, the attenuator is set to 40 dB (low volume), so the gain of the total amplifier is then 20 dB. Some positive pulses have to be applied to the UP/DOWN pin to achieve listening volume. The graph shows the THD as a function of output power. The maximum quiescent current consumption of the amplifier is specified at 10 mA, to which should be added the current resulting from the output offset voltage divided by the load impedance.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    High frequency crystal oscillator
    Servo-sensed-heater-protector
    power supply Inductive choke with bypass capacitors
    Time Switch
    Schematic Diagram LM35 Smart Heater Controller Project
    fm radio receiver
    GSM Based Home Automation Project Report
    Alarm Control Electronic Keypad Project
    Block Transistor Radio
    By the PGA204 205 op amp OPA602 programmable AC coupled amplifier
    Low-noise pre-equalizer circuit



    Top