TDA8933B Datasheet, PDF (5/42 Pages) NXP Semiconductors – Class D audio amplifier

NXP Semiconductors
TDA8933B
Class D audio amplifier
Table 3. Pinning description …continued
Symbol
Pin
Description
HVP2
19
half supply output voltage 2 for charging single-ended capacitor for
channel 2
V_DDP2
20
positive power supply voltage for channel 2
BOOT2
21
bootstrap high-side driver channel 2
OUT2
22
Pulse Width Modulated (PWM) output channel 2
V_SSP2
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
V_SSP1
OUT1
26
negative power supply voltage for channel 1
27
PWM output channel 1
BOOT1
28
bootstrap high-side driver for channel 1
V_DDP1
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
V_SSD(HW)
32
Exposed die -
pad^[1]
negative digital supply voltage and handle wafer connection
[1] The exposed die pad has to be connected to V_SSD(HW).
8. Functional description
8.1 General
The TDA8933B is a mono full-bridge or stereo half-bridge audio power amplifier using
class D technology. The audio input signal is converted into a PWM signal via an analog
input stage and a 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
2^nd-order low-pass filter in the application converts the PWM signal to an analog audio
signal across the loudspeakers.
The TDA8933B 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 TDA8933B contains circuits common 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 and overtemperature, current and voltage
protections.
TDA8933B_1
Preliminary data sheet
Rev. 01 — 23 October 2008
© NXP B.V. 2008. All rights reserved.
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