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TDA8920BJ Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8920BJ Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 34 page 9397 750 13356 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 1 October 2004 5 of 34 Philips Semiconductors TDA8920B 2 × 100 W class-D power amplifier 8. Functional description 8.1 General The TDA8920B is a two channel audio power amplifier using class-D technology. 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 TDA8920B 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 TDA8920B 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 TDA8920B contains two independent amplifier channels with high output power, high efficiency, 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. SGND1 11 5 signal ground for channel 1 VSSA1 12 6 negative analog supply voltage for channel 1 PROT 13 7 decoupling capacitor for protection (OCP) VDDP1 14 8 positive power supply voltage for channel 1 BOOT1 15 9 bootstrap capacitor for channel 1 OUT1 16 10 PWM output from channel 1 VSSP1 17 11 negative power supply voltage for channel 1 STABI 18 12 decoupling of internal stabilizer for logic supply n.c. 19 - not connected VSSP2 20 13 negative power supply voltage for channel 2 OUT2 21 14 PWM output from channel 2 BOOT2 22 15 bootstrap capacitor for channel 2 VDDP2 23 16 positive power supply voltage for channel 2 VSSD 24 17 negative digital supply voltage Table 3: Pin description …continued Symbol Pin Description TDA8920BTH TDA8920BJ |
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