Datasheet TDA8566 (NXP) - 6

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NXP Semiconductors TDA8566 2
×
40 W/2
Ω
stereo BTL car radio power amplifier Table 4. Pin description TDA8566Q
…continued
Symbol Pin Description
OUT2+ 10 channel 2 output positive PGND2 11 power ground 2 OUT2− 12 channel 2 output negative VP2 13 supply voltage 2 MODE 14 mode select switch input (standby/mute/operating) DIAG 15 short-circuit and temperature pre-warning diagnostic output IN2+ 16 channel 2 input positive IN2− 17 channel 2 input negative
7. Functional description
The TDA8566 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:
•
Mode select switch
•
Clip detection
•
Short-circuit diagnostic
•
Temperature pre-warning
•
Open-collector diagnostic outputs
•
Differential inputs
7.1 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 Figure 8.
7.2 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 Figure 5. TDA8566_6 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 06 — 15 October 2007 6 of 21
Document Outline 1. General description 2. Features 3. Quick reference data 4. Ordering information 5. Block diagram 6. Pinning information 6.1 Pinning 6.2 Pin description 7. Functional description 7.1 Mode select switch (pinMODE) 7.2 Clip detection (pinCLIP) 7.3 Short-circuit diagnostic (pinDIAG) 7.4 Temperature pre-warning (pinDIAG) 7.5 Open-collector diagnostic outputs 7.6 Differential inputs 8. Limiting values 9. Thermal characteristics 10. Static characteristics 11. Dynamic characteristics 12. Application information 12.1 Diagnostic output 12.2 Mode select switch 13. Test information 14. Package outline 15. Soldering 15.1 Introduction to soldering 15.2 Wave and reflow soldering 15.3 Wave soldering 15.4 Reflow soldering 16. Revision history 17. Legal information 17.1 Data sheet status 17.2 Definitions 17.3 Disclaimers 17.4 Trademarks 18. Contact information 19. Contents