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HEF4047BT Datasheet(PDF) 7 Page - NXP Semiconductors |
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HEF4047BT Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 36 page  2003 Mar 20 7 Philips Semiconductors Objective specification 2 × 25 W class-D power amplifier TDA8922 8 FUNCTIONAL DESCRIPTION 8.1 General The TDA8922 is a two channel audio power amplifier using class-D technology. A detailed application reference design is shown in Fig.10. Typical application schematics are shown in Figs 37 and 38. The audio input signal is converted into a digital Pulse Width Modulated (PWM) signal via an analog input stage and PWM modulator. To enable the output power transistors to be driven, this digital PWM signal is applied to a control and handshake block and driver circuits for both the high side and low side. In this way a level shift is performed from the low power digital PWM signal (at logic levels) to a high power PWM signal which switches between the main supply lines. A 2nd-order low-pass filter converts the PWM signal to an analog audio signal across the loudspeakers. The TDA8922 one-chip class-D amplifier contains high power D-MOS switches, drivers, timing and handshaking between the power switches and some control logic. For protection a temperature sensor and a maximum current detector are built-in. The two audio channels of the TDA8922 contain two PWMs, two analog feedback loops and two differential input stages. It also contains circuits common to both channels such as the oscillator, all reference sources, the mode functionality and a digital timing manager. The TDA8922 contains two independent amplifier channels with high output power, high efficiency (90%), low distortion and a low quiescent current. The amplifier channels can be connected in the following configurations: • Mono Bridge-Tied Load (BTL) amplifier • Stereo Single-Ended (SE) amplifiers. The amplifier system can be switched in three operating modes with pin MODE: • Standby mode; with a very low supply current • Mute mode; the amplifiers are operational, but the audio signal at the output is suppressed • Operating mode; the amplifiers fully are operational with output signal. An example of a switching circuit for driving pin MODE is illustrated in Fig.4. For suppressing plop noise, the amplifier will remain automatically in the mute mode for approximately 150 ms before switching to the operating mode (see Fig.5). During this time, the coupling capacitors at the input are fully charged. handbook, halfpage standby/ mute R R mute/on MODE pin SGND MBL463 +5 V Fig.4 Example of mode selection circuit. |
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