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TDA8920J Datenblatt(PDF) 5 Page - NXP Semiconductors |
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TDA8920J Datenblatt(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 1998 Dec 01 5 Philips Semiconductors Preliminary specification 2 × 50 W class-D power amplifier TDA8920 FUNCTIONAL DESCRIPTION The TDA8920 is a multi purpose audio power amplifier in class-D technology. It contains two independent amplifiers with high output power, high efficiency (90%), low distortion and a low quiescent current. The amplifiers can be connected in the following configurations: • Mono bridge-tied load amplifier • Stereo single-ended amplifiers. The amplifier can be switched in three operating modes with the mode select input: • Standby mode, with a very low supply current (practically zero) • Mute mode; the amplifiers are operational but the audio signal at the output is suppressed • Operating mode (amplifier fully operational) with output signal. For suppressing plop noise the amplifier will remain automatically for approximately 500 ms in the mute mode before switching to operating mode. During this time the coupling capacitors at the input are fully charged. An example of a switching circuit for driving the mode select input is illustrated in Fig.3. Pulse Width Modulation (PWM) frequency The output signal of the amplifier is a PWM signal with a sample frequency of 500 kHz. The use of a second order LC filter in the application results in an analog audio signal across the loudspeaker. This switching frequency is fixed by an external resistor ROSC connected between pin OSC and pin SGND. With the resistor value given in the application diagram, the oscillating frequency is typical 500 kHz. The oscillator frequency can be calculated using: If two or more devices are used in the same audio system it is advised to have both devices working on the same oscillation frequency. This can be realized by connecting all OSC pins together. f osc 5.10 9 R OSC -------------- Hz [] = Current limiting With an external resistor RLIM connected between pin LIM and VSS the maximum output current of the amplifiers can be set. If pin LIM is short-circuited to VSS, then the maximum output current is limited to 7 A. The relationship between maximum output current and resistor value is given by: Protections Protections are included to avoid the device being damaged at: • Over-temperature Tj > 150 °C • Short-circuit of the loudspeaker terminals: when short-circuited the power dissipation is limited • A maximum current limiter which limits the maximum output current to 7 A, or to the value set by RLIM. During limiting the current is measured and when the current is higher than 7 A, the amplifier is switched off within 3 µs and every 20 ms the IC tries to restart. The dissipation will be low because of this low duty cycle. • ESD protection (human body model: 3000 V and machine model: 300 V). I O(max) 70.10 3 10.10 3 R LIM + ------------------------------------------- A [] = Fig.3 Mode select input drive circuit. handbook, halfpage MGR660 R pin MODE SGND R +5 V standby/on mute |
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