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TDA8566TH Datenblatt(PDF) 5 Page - NXP Semiconductors |
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TDA8566TH Datenblatt(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 2001 Apr 24 5 Philips Semiconductors Objective specification 2 × 40 W/2 Ω stereo BTL car radio power amplifier with differential inputs and diagnostic outputs TDA8566TH FUNCTIONAL DESCRIPTION The TDA8566TH contains 2 identical amplifiers and can be used for BTL applications. The gain of each amplifier is fixed at 26 dB. Special features of this device are: 1. Mode select switch 2. Clip detection 3. Short-circuit diagnostic 4. Temperature pre-warning 5. Open-collector diagnostic outputs 6. Differential inputs. Mode select switch (pin MODE) • Standby: low supply current • Mute: input signal suppressed • Operating: normal on condition. Since this pin has a very low input current (<40 µA), a low cost supply switch can be applied. To avoid switch-on plops, it is advisable to keep the amplifier in the mute mode for a period of ≥150 ms (charging the input capacitors at pins IN1+, IN1 −, IN2+ and IN2−). This can be realized by using a microcontroller or by using an external timing circuit as illustrated in Fig.7. Clip detection (pin CLIP) When clipping occurs at one or more output stages, the dynamic distortion detector becomes active and pin CLIP goes LOW. This information can be used to drive a sound processor or a DC volume control to attenuate the input signal and so limit the level of distortion. The output level of pin CLIP is independent of the number of channels that are being clipped. The clip detection circuit is disabled in a short-circuit condition, so if a fault condition occurs at the outputs, pin CLIP will remain at a HIGH level. The clip detection waveforms are illustrated in Fig.3. Short-circuit diagnostic (pin DIAG) 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 the removal of the short-circuit). During this short-circuit condition, pin DIAG is continuously LOW. When a short-circuit occurs across the load of one or both channels, the output stages are switched off for approximately 20 ms. After that time the load condition 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 the short-circuit condition is very low (approximately 40 mA). During this condition, pin DIAG is LOW for 20 ms and HIGH for 50 µs; see Fig.4. The power dissipation in any short-circuit condition is very low. Temperature pre-warning (pin DIAG) When the junction temperature (Tvj) reaches 145 °C, pin DIAG will become continuously LOW. Open-collector diagnostic outputs Pins DIAG and CLIP are open-collector outputs, therefore more devices can be tied together. Pins DIAG and CLIP can also be tied together. An external pull-up resistor is required. Differential inputs The input stage is a high-impedance fully differential balanced input stage that is also capable of operating in a single-ended mode with one of the inputs capacitively coupled to an audio ground. It should be noted that if a source resistance is added (input voltage dividers) the CMRR degrades to lower values. handbook, halfpage 0 VO (V) VCLIP (V) 0 t (s) MGU357 Fig.3 Clip detection waveforms. |
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Ähnliche Beschreibung - TDA8566TH |
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