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PDF TDA8932B Data sheet ( Hoja de datos )

Número de pieza TDA8932B
Descripción Class-D audio amplifer
Fabricantes NXP Semiconductors 
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TDA8932B
Class-D audio amplifier
Rev. 02 — 29 March 2007
Preliminary data sheet
1. General description
The TDA8932B is a high efficiency class-D amplifier with low power dissipation.
The continuous time output power is 2 × 15 W in stereo half-bridge application (RL = 4 )
or 1 × 30 W in mono full-bridge application (RL = 8 ). Due to the low power dissipation
the device can be used without any external heat sink when playing music. Due to the
implementation of thermal foldback, even for high supply voltages and/or lower load
impedances, the device remains operating with considerable music output power without
the need for an external heat sink.
The device has two full-differential inputs driving two independent outputs. It can be used
as mono full-bridge configuration (BTL) or as stereo half-bridge configuration (SE).
2. Features
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I Operating voltage from 10 V to 36 V asymmetrical or ±5 V to ±18 V symmetrical
I Mono-bridged tied load (full-bridge) or stereo single-ended (half-bridge) application
I Application without heatsink using thermally enhanced small outline package
I High efficiency and low-power dissipation
I Thermally protected and thermal foldback
I Current limiting to avoid audio holes
I Full short-circuit proof across load and to supply lines (using advanced current
protection)
I Switchable internal or external oscillator (master-slave setting)
I No pop noise
I Full-differential inputs
3. Applications
I Flat panel television sets
I Flat panel monitor sets
I Multimedia systems
I Wireless speakers
I Mini and micro systems
I Home sound sets

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TDA8932B pdf
NXP Semiconductors
TDA8932B
Class-D audio amplifier
Table 3. Pin description (Continued)
Symbol
Pin Description
HVP2
19 half supply output voltage 2 for charging single-ended capacitor for
channel 2
VDDP2
BOOT2
20 positive power supply voltage for channel 2
21 bootstrap high-side driver channel 2
OUT2
22 PWM output channel 2
VSSP2
STAB2
23 negative power supply voltage for channel 2
24 decoupling of internal 11 V regulator for channel 2 drivers
STAB1
25 decoupling of internal 11 V regulator for channel 1 drivers
VSSP1
OUT1
26 negative power supply voltage for channel 1
27 PWM output channel 1
BOOT1
28 bootstrap high-side driver channel 1
VDDP1
HVP1
29 positive power supply voltage for channel 1
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)
Exposed die
pad
32
-
negative digital supply voltage and handle wafer connection
HTSSOP32 package only[1]
[1] The exposed die pad has to be connected to VSSD(HW).
8. Functional description
8.1 General
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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.
TDA8932B_2
Preliminary data sheet
Rev. 02— 29 March 2007
© NXP B.V. 30 March 2007. All rights reserved.
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TDA8932B arduino
NXP Semiconductors
TDA8932B
Class-D audio amplifier
8.5 Diagnostic input and output
Whenever a protection is triggered, except for TF, pin DIAG is activated to LOW level (see
Table 6). An internal reference supply will pull-up the open-drain DIAG output to
approximately 2.4 V. This internal reference supply can deliver approximately 50 µA.
Pin DIAG refers to pin CGND. The diagnostic output signal during different short
conditions is illustrated in Figure 6. Using pin DIAG as input, a voltage < 0.8 V will put the
device into Fault mode.
Vo
2.4 V
Vo
2.4 V
amplifier
restart
0V 0V
50 ms 50 ms
shorted load
no restart
short to
supply line
001aad759
Fig 6. Diagnostic output for different short-circuit conditions
8.6 Differential inputs
For a high common-mode rejection ratio and a maximum of flexibility in the application,
the audio inputs are fully differential. By connecting the inputs anti-parallel, the phase of
one of the two channels can be inverted, so that the amplifier can operate as a mono BTL
amplifier. The input configuration for a mono BTL application is illustrated in Figure 7.
In SE configuration it is also recommended to connect the two differential inputs in
anti-phase. This has advantages for the current handling of the power supply at low signal
frequencies and minimizes supply pumping (see also Section 14.8).
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audio
input
IN1P
IN1N
OUT1
IN2P
IN2N
Fig 7. Input configuration for mono BTL application
OUT2
001aad760
8.7 Output voltage buffers
When pin POWERUP is set HIGH, the half supply output voltage buffers are switched on
in asymmetrical supply configuration. The start-up will be pop free since the device starts
switching when the capacitor on pin HVPREF and the SE capacitors are completely
charged.
TDA8932B_2
Preliminary data sheet
Output voltage buffers:
Rev. 02— 29 March 2007
© NXP B.V. 30 March 2007. All rights reserved.
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