NXP Semiconductors TFA9810 - page 7

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

Product data sheet Rev. 03 — 20 February 2008 7 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

•OverVoltage Protection (OVP)

When the supply voltage applied to the TFA9810 exceeds the maximum supply

voltage threshold level the device will shut down. The device will restart when the

supply voltage is within the operating range.

•UnderVoltage Protection (UVP)

When the supply voltage applied to the TFA9810 falls below the minimum supply

voltage threshold level the device will shut down. The device will restart when the

supply voltage is within the operating range.

•OverDissipation Protection (ODP)

The ODP in the TFA9810 is a combination of two protections. Exceeding a

temperature threshold level of 135 °C an internal pre-warning is generated. When an

overcurrent is detected during the pre-warning the device will shut down. When the

ENABLE pin is high the TFA9810 will restart automatically. The restart sequence

(switch-off → switch-on) will take 200 ms to 500 ms.

•Window Protection (WP)

During start-up, if one of the outputs is shorted to VSS or VDD the device will not start.

This is an effective measure to protect the device against shorts between the outputs

(before the ﬁlter) and the ground or supply lines. The supply must be switched off prior

to removing any short. The WP protects the device against failure during board

assembly.

Table 6. Overview protections

Protections

Symbol Condition DIAG Outputs Recovering

OTP Tj > 150 °C LOW Floating Automatic, after 5 µs and Tj < 150 °C

OCP IO > IORM LOW Floating Automatic, after 5 µs and IO < IORM

OVP VP > 20 V LOW Floating Restart (switch-off → switch-on when VP< 20 V)

UVP VP < 8 V LOW Floating Restart (switch-off → switch-on when VP> 8 V)

ODP Tj > 135 °C and IO > IORM LOW Floating Restart (switch-off → switch-on when

Tj< 135 °CorI

O<I

ORM)

WP OUTX > VDDA - 1 V or

OUTX < VSSA + 1 V LOW

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