Manuals / Brands / Home Audio / Stereo Amplifier / NXP Semiconductors / Home Audio / Stereo Amplifier

NXP Semiconductors TFA9810 , 14.3 Speaker conguration and impedance, 14.4 Differential input, 14.5 Single-ended input

1 29

Download 29 pages, 163.78 Kb

TFA9810_3 © NXP B.V. 2008. All rights reserved.

Product data sheet Rev. 03 — 20 February 2008 20 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

•RL = load resistance [Ω].

•RDSon = drain-source on-state resistance [Ω].

•Rs = series resistance [Ω].

Example:

A 4 Ω speaker in BTL conﬁguration can be used up to a supply voltage of 12 V without

running into current limiting. Current limiting (clipping) will avoid audio holes, but it causes

a sound distortion similar to voltage clipping.

14.3 Speaker conﬁguration and impedance

For a ﬂat-frequency response (second-order Butterworth ﬁlter) it is necessary to change

the low-pass ﬁlter components LLC and CLC according to the speaker conﬁguration and

impedance. Table 12 shows the practical required values:

14.4 Differential input

For a high common-mode rejection ratio and a maximum of ﬂexibility in the application,

the audio inputs of the application are fully differential.

The input conﬁguration for a differential-input application is illustrated in Figure 28.

14.5 Single-ended input

When using an audio source with a single-ended ‘out’, it is important to connect the IN1N

from the application board to the VSS/GND of the audio source (e.g. Audio DSP).

The input conﬁguration for single-ended ‘in’ application is illustrated in Figure 29.

Table 12. Filter component values

Conﬁguration Impedance [Ω] LLC [µF] CLC [nF]

BTL 4 10 1500

6 16 1000

8 22 680

Fig 28. Input conﬁguration for differential input

IN1P

IN1N

AUDIO

DSP

OUT1P

OUT1N

010aaa021

+

−

VSS

Contents

Main 1. General description 2. Features 4. Quick reference data TFA9810 Stereo full-bridge audio amplier 2 x 12 W Rev. 03 20 February 2008 Product data sheet Audio amplier 2 x 12 W = 25 5. Ordering information = 12 V; f = 550 kHz; Figure 33 unless otherwise specied Product data sheet Rev. 03 20 February 2008 3 of 29 6. Block diagram Fig 1. Block diagram 7. Pinning information 7.1 Pinning Fig 2. Pin conguration 7.2 Pin description 8. Functional description 8.1 General 8.2 Interfacing 8.3 Input comparators 8.3.1 Operating in self-oscillating conguration 8.3.2 Operating in open-loop conguration 8.4 Diagnostic 8.5 Protections Page Product data sheet Rev. 03 20 February 2008 8 of 29 NXP Semiconductors TFA9810 9. Internal circuitry Fig 4. Internal circuitry 0001 8.6 Start-up sequence Fig 3. Start-up sequence Product data sheet Rev. 03 20 February 2008 9 of 29 NXP Semiconductors TFA9810 Fig 5. Internal circuitry 0002 Fig 7. Internal circuitry 0004 Fig 6. Internal circuitry 0003 NXP Semiconductors TFA9810 Fig 8. Internal circuitry 0005 Fig 10. Internal circuitry 0007 Fig 9. Internal circuitry 0006 Fig 11. Internal circuitry 0008 Fig 12. Internal circuitry 0009 Fig 14. Internal circuitry 0011 Fig 13. Internal circuitry 0010 Audio amplier 2 x 12 W Fig 15. Internal circuitry 0012 Fig 18. Internal circuitry 0015 Fig 16. Internal circuitry 0013 Fig 17. Internal circuitry 0014 Fig 19. Internal circuitry 0016 Fig 20. Internal circuitry 0017 Fig 22. Internal circuitry 0019 Fig 21. Internal circuitry 0018 10. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). 11. Thermal characteristics 12. Characteristics = 25 12.1 Static characteristics In accordance with the Absolute Maximum Rating System (IEC 60134). 12.2 Dynamic characteristics = 25 = 12 V; f = 550 kHz; Figure 33 unless otherwise specied = 12 V; R 12.3 AC characteristics measured in a typical application = 25 = 8 = 25 = 12 V; R 13. Quality specication 14. Application information 14.1 Output power estimation 14.2 Output current limiting ------------------------------------------------------3 A +()+ DSon Rs (1) RL = 4 (2) RL = 6 (3) RL= 8 14.3 Speaker conguration and impedance 14.4 Differential input 14.5 Single-ended input 14.6 Curves measured in a typical application Fig 29. Input conguration for single-ended input Fig 30. Gain as a function of frequency VP= 12 V, Vi = 100 mV 14.7 Typical application diagram TFA9810 VP=12V,R Fig 32. Total harmonic distortion as a function of output power Fig 31. Total harmonic distortion + noise as a function of frequency VP=12V,R Fig 33. Typical application diagram TFA9810 Fig 34. Typical application diagram TFA9810 with externally adjusted switch-on time 14.8 Typical application: bill of materials 14.9 Snubber network 15. Test information 16. Package outline Fig 35. Package outline SOT287-1 (SO23) SO32: plastic small outline package; 32 leads; body width 7.5 mm SOT287-1 17. Revision history 18. Legal information 18.1 Data sheet status 18.2 Denitions 18.3 Disclaimers 18.4 Trademarks 20. Contents