NXP Semiconductors TFA9810 manual

1. General description

The TFA9810 is a two-channel power comparator for high-efﬁciency class D audio

ampliﬁer systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive

logic, protection control logic and full differential input comparators. By using this power

comparator a compact closed-loop self-oscillating digital ampliﬁer system or open-loop

system can be built. The TFA9810 does not require a heat sink and operates using an

asymmetrical supply voltage.

2. Features

nStereo full-bridge power comparator for class D audio ampliﬁer applications

nNo external heat sink required

nOperating voltage range: asymmetrical from 8 V to 20 V

nThermally protected

nZero dead-time switching

nCurrent-limiting (no audible interruptions)

3. Applications

nSelf-oscillating or open-loop class D audio ampliﬁer applications

nFlat-panel television sets

nFlat-panel monitors

nMultimedia systems

nWireless speakers

nHigh-end CRT television sets

4. Quick reference data

TFA9810

Stereo full-bridge audio ampliﬁer 2 x 12 W

Rev. 03 — 20 February 2008 Product data sheet

Table 1. Quick reference data

T

amb

= 25

°

C; V

P

= 12 V; f

osc

= 550 kHz; Figure 33 unless otherwise speciﬁed

Symbol Parameter Condition Min Typ Max Unit

VPsupply voltage VP = VDDPx − VSSPx 81220V

Ioff off-state current off mode - 110 200 µA

Iqquiescent current with load, ﬁlter and

snubbers connected -3545mA

ηpo output power

efﬁciency output power

2 x 9 W into 8 Ω;

Po=P

o(nom)

87 89 - %

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