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TDA8561Q Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8561Q Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 24 page  1999 Jun 30 5 Philips Semiconductors Product specification 2 × 24 W BTL or 4 × 12 W single-ended car radio power amplifier TDA8561Q FUNCTIONAL DESCRIPTION The TDA8561Q contains four identical amplifiers and can be used for Single-Ended (SE) or Bridge-Tied Load (BTL) applications. The gain of each amplifier is fixed at 20 dB (26 dB in BTL). Special features of the device are: Mode select switch (pin 14) • Low standby current (<100 µA) • Low switching current (low cost supply switch) • Mute facility. To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during ≥100 ms (charging of the input capacitors at pins 1, 3, 15 and 17). This can be achieved by: • Microcontroller control • External timing circuit (see Fig.11). Diagnostic output (pin 16) DYNAMIC DISTORTION DETECTOR (DDD) At the onset of clipping of one or more output stages, the dynamic distortion detector becomes active and pin 16 goes LOW. This information can be used to drive a sound processor or DC volume control to attenuate the input signal and thus limit the distortion. The output level of pin 16 is independent of the number of channels that are clipping (see Figs 3 and 4). SHORT-CIRCUIT PROTECTION When a short-circuit occurs at one or more outputs to ground or to the supply voltage, the output stages are switched off until the short-circuit is removed and the device is switched on again, with a delay of approximately 20 ms, after removal of the short-circuit. During this short-circuit condition, pin 16 is continuously LOW. When a short-circuit across the load of one or both channels occurs the output stages are switched off for approximately 20 ms. After that time it is checked during approximately 50 µs to see whether the short-circuit is still present. Due to this duty cycle of 50 µs/20 ms the average current consumption during this short-circuit condition is very low (approximately 40 mA). During this short-circuit condition, pin 16 is LOW for 20 ms and HIGH for 50 µs (see Fig.5). The power dissipation in any short-circuit condition is very low. Fig.3 Distortion detector waveform; BTL application. handbook, halfpage V 0 VP VO 0 t MGA705 16 Fig.4 Distortion detector waveform; single-ended application. handbook, halfpage 0 VP VO t 0 MGA706 V16 |
Similar Part No. - TDA8561Q_15 |
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Similar Description - TDA8561Q_15 |
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