Amplifiers

Features Class-T architecture with proprietary DPP  “Audiophile” Sound Quality  Full Audio Bandwidth, 20Hz to 20kHz  High Efficiency  Supports wide range of output power levels and output loads by changing supply voltage  and external Mosfets  Compatible with unregulated power supplies  Output over-current protection  Over- and under-voltage protection  Over-temperature protection  48-Pin LQFP Package Description The TDA1400 is a one-channel, Amplifier Driver that uses Tripath’s proprietary Digital Power Processing   (DPPTM) technology. The TDA1400 offers higher integration over previous Tripath amplifiers driver   chipsets while providing exceptional audio performance for real world applications. Class-T amplifiers  offer both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers.  The TDA1400 is typically configured as a single supply, bridged output. This makes the power ...

Circuit Description      The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio. Then, a 12dB/octave variable frequency Car Subwoofer Amplifier Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.      This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to dr...