NXP Semiconductors TDA8932B 8. Functional description

TDA8932B_3 © NXP B.V. 21 June 2007. All rights reserved.

Product data sheet Rev. 03— 21 June 2007 5 of 48

NXP Semiconductors TDA8932B

Class-D audio ampliﬁer

[1] The exposed die pad has to be connected to VSSD(HW).

8. Functional description

8.1 General

The TDA8932B is a mono full-bridge or stereo half-bridge audio power ampliﬁer using

class-D technology. The audio input signal is converted into a Pulse Width Modulated

(PWM) signal via an analog input stage and PWM modulator. To enable the output power

Diffusion Metal Oxide Semiconductor (DMOS) transistors to be driven, this digital PWM

signal is applied to a control and handshake block and driver circuits for both the high side

and low side. A 2nd-order low-pass ﬁlter converts the PWM signal to an analog audio

signal across the loudspeakers.

The TDA8932B contains two independent half-bridges with full differential input stages.

The loudspeakers can be connected in the following conﬁgurations:

•Mono full-bridge: Bridge Tied Load (BTL)

•Stereo half-bridge: Single-Ended (SE)

The TDA8932B contains common circuits to both channels such as the oscillator, all

reference sources, the mode functionality and a digital timing manager. The following

protections are built-in: thermal foldback, temperature, current and voltage protections.

HVP2 19 half supply output voltage 2 for charging single-ended capacitor for

channel 2

VDDP2 20 positive power supply voltage for channel 2

BOOT2 21 bootstrap high-side driver channel 2

OUT2 22 PWM output channel 2

VSSP2 23 negative power supply voltage for channel 2

STAB2 24 decoupling of internal 11 V regulator for channel 2 drivers

STAB1 25 decoupling of internal 11 V regulator for channel 1 drivers

VSSP1 26 negative power supply voltage for channel 1

OUT1 27 PWM output channel 1

BOOT1 28 bootstrap high-side driver channel 1

VDDP1 29 positive power supply voltage for channel 1

HVP1 30 half supply output voltage 1 for charging single-ended capacitor for

channel 1

OSCIO 31 oscillator input in slave conﬁguration or oscillator output in master

conﬁguration

VSSD(HW) 32 negative digital supply voltage and handle wafer connection

Exposed die

pad - HTSSOP32 package only[1]

Table 3. Pin description (Continued)

Symbol Pin Description

Contents

Main 1. General description 2. Features 3. Applications TDA8932B Rev. 03 21 June 2007 Product data sheet Class-D audio amplier NXP Semiconductors TDA8932B 4. Quick reference data =25 5. Ordering information = 22 V; f = 320 kHz; T 6. Block diagram Fig 1. Block diagram Product data sheet Rev. 03 21 June 2007 4 of 48 7. Pinning information TDA8932BTW TDA8932BT 7.1 Pinning Fig 2. Pin conguration SO32 Fig 3. Pin conguration HTSSOP32 8. Functional description 8.1 General 8.2 Mode selection and interfacing 8.3 Pulse width modulation frequency NXP Semiconductors TDA8932B 8.4 Protection NXP Semiconductors TDA8932B 8.4.1 Thermal Foldback (TF) 8.4.2 OverTemperature Protection (OTP) 8.4.3 OverCurrent Protection (OCP) 8.4.4 Window Protection (WP) 8.5 Diagnostic input and output 8.6 Differential inputs 8.7 Output voltage buffers 4 DIAG HVPREF. 9. Internal circuitry Table 7. Internal circuitry 1V 16 V 17 V 32 V 2 IN1P 3 IN1N 12 INREF 14 IN2N 15 IN2P 5 ENGAGE 6 POWERUP 7 CGND 8V Table 7. Internal circuitry (Continued) 9V 10 OSCREF 18 DREF 11 HVPREF 13 TEST Page 10. Limiting values 11. Thermal characteristics In accordance with the Absolute Maximum Rating System (IEC 60134). 12. Static characteristics Page 13. Dynamic characteristics =25 4 =2 = 22 V; T =2 4 =8 = 320 kHz; R =8 = 320 kHz; R 14. Application information 14.1 Output power estimation a. THD+N = 0.5 % b. THD+N = 10 % Fig 8. SE output power as a function of supply voltage a. THD+N = 0.5 % b. THD+N = 10 % Fig 9. BTL output power as a function of supply voltage 14.2 Output current limiting 14.3 Speaker conguration and impedance 14.4 Single-ended capacitor 14.5 Gain reduction 14.6 Device synchronization 14.7 Thermal behavior (printed-circuit board considerations) 14.8 Pumping effects Fig 12. SE application for reducing pumping effects 14.9 SE curves measured in reference design a. VP=22V; R Fig 14. Total harmonic distortion-plus-noise as a function of frequency Fig 13. Total harmonic distortion-plus-noise as a function of output power per channel (1) fi= 6 kHz (2) fi= 100 Hz (3) fi= 1 kHz Vi= 100 mV (RMS); Ri=0; Cse = 1000 F (1) VP= 30 V; RL=28 (2) VP= 22 V; RL=24 Vripple = 500 mV (RMS) referenced to ground; Ri=0 (shorted input) (1) VP=30V; R (2) VP=22V; R Ri=0; 20 kHz brick-wall lter AES17 (1) VP= 22 V; RL=24 (2) VP= 30 V; RL=28 Po= 1 W; CHVPREF =47F voltage = ------------------------- per channel (two channels driven) fi= 1 kHz; (1) VP= 22 V; RL=24 (2) VP= 30 V; RL=28 NXP Semiconductors TDA8932B ENGAGE Fig 23. Output power per channel as a function of time board (55 mm 45 mm) without heat sink (1) VP=22V (2) VP=26V (3) VP=29V 14.10 BTL curves measured in reference design a. VP=12V; R Fig 27. Total harmonic distortion-plus-noise as a function of frequency Fig 26. Total harmonic distortion-plus-noise as a function of output power (1) fi= 6 kHz (2) fi= 1 kHz (3) fi= 100 Hz Vi= 100 mV (RMS); Ri=0 (1) VP= 12 V; RL=4 (2) VP= 22 V; RL=8 Vripple = 500 mV (RMS) referenced to ground; Ri=0 (shorted input) (2) VP=12V; R Ri=0; 20 kHz brick-wall lter AES17 (1) RL=4; VP=12V (2) RL=8; VP=22V fi= 1 kHz (short time PO); dashed line will require board (55 mm 45 mm) without heat sink = -------------------- Fig 32. Output power as a function of time (1) VP=12V (2) VP= 13.5 V (3) VP=15V Fig 35. Power dissipation as a function of supply voltage 14.11 Typical application schematics (simplied) Fig 36. Typical simplied application diagram for 2 SE (asymmetrical supply) Fig 37. Typical simplied application diagram for 1 BTL (asymmetrical supply) Fig 38. Typical simplied application diagram for 2 SE (symmetrical supply) 15. Test information Fig 39. Typical simplied application diagram for 1 BTL (symmetrical supply) 15.1 Quality information is applicable. General Quality Specication for Integrated Circuits, SNW-FQ-611 16. Package outline Fig 40. Package outline SOT287-1 (SO32) SO32: plastic small outline package; 32 leads; body width 7.5 mm SOT287-1 Fig 41. Package outline SOT549-1 (HTSSOP32) 32 17 116 17. Soldering 17.4 Reow soldering For further information on temperature proles, refer to Application Note 18. Abbreviations AN10365 Surface mount reow soldering description . 19. Revision history Product data sheet Rev. 03 21 June 2007 47 of 48 20. Legal information 20.1 Data sheet status 20.2 Denitions 20.3 Disclaimers 20.4 Trademarks 22. Contents