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NXP Semiconductors TFA9810 8.3 Input comparators, 8.4 Diagnostic, 8.5 Protections

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

Product data sheet Rev. 03 — 20 February 2008 6 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

In SLEEP mode the TFA9810 is not biased and has a very low supply current.

When the TFA9810 is set to OPERATING mode the device is started via the start-up

sequence, which provides a pop-free start-up behavior. After start-up the reference

voltages STAB are present and the outputs start switching.

8.3 Input comparators

The input stages have a differential input and are optimized for low noise and low offset.

This results in maximum ﬂexibility in the application.

8.3.1 Operating in self-oscillating conﬁguration

The inputs (IN1P, IN1N, IN2P, IN2N) of the comparators are internally set to a voltage level

of 0.5VP, but only during the start-up sequence. In operating mode the inputs are

high-ohmic.

8.3.2 Operating in open-loop conﬁguration

No internal voltages are applied to the inputs. The input pins (IN1P, IN1N, IN2P, IN2N) are

pulled down to VSSA level by internal resistors.

8.4 Diagnostic

The DIAG output is an open-drain output. The maximum current is 2 mA. Whenever one

of the protections is triggered the DIAG output is activated low. The DIAG output refers to

VSSD.

8.5 Protections

Overtemperature, overcurrent, overvoltage, undervoltage, overdissipation sensors, and

window protection are included in the TFA9810. When one of these sensors exceeds its

threshold level either the output power stage is switched off and the outputs (OUT1N,

OUT1P, OUT2N, OUT2P) become ﬂoating, or the TFA9810 shuts down and starts up

immediately.

•OverTemperature Protection (OTP)

If the junction temperature (Tj) exceeds a threshold level of about 150 °C then the

outputs become ﬂoating. The device will start switching again after 5 µs and when the

temperature is below 150 °C. This is thermal limitation without audible interruptions.

•OverCurrent Protection (OCP)

If the output current exceeds the maximum output current threshold level the output

becomes ﬂoating. The device will start switching again after 5 µs. This is current

limitation without audible interruptions.

Table 5. Start-up

Interfacing

ENABLE [V] Mode

ENABLE < 0.8 V SLEEP

ENABLE > 3 V OPERATING

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