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TDA8920BJ Datasheet(PDF) 5 Page - NXP Semiconductors

Part # TDA8920BJ
Description  2 X 100 W class-D power amplifier
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8920BJ Datasheet(HTML) 5 Page - NXP Semiconductors

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9397 750 13356
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 1 October 2004
5 of 34
Philips Semiconductors
TDA8920B
2
× 100 W class-D power amplifier
8.
Functional description
8.1 General
The TDA8920B is a two channel audio power amplifier using class-D technology.
The audio input signal is converted into a digital Pulse Width Modulated (PWM) signal via
an analog input stage and PWM modulator. To enable the output power 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. In this way a level shift is performed from the
low power digital PWM signal (at logic levels) to a high power PWM signal which switches
between the main supply lines.
A 2nd-order low-pass filter converts the PWM signal to an analog audio signal across the
loudspeakers.
The TDA8920B one-chip class-D amplifier contains high power D-MOS switches, drivers,
timing and handshaking between the power switches and some control logic. For
protection a temperature sensor and a maximum current detector are built-in.
The two audio channels of the TDA8920B contain two PWMs, two analog feedback loops
and two differential input stages. It also contains circuits common to both channels such
as the oscillator, all reference sources, the mode functionality and a digital timing
manager.
The TDA8920B contains two independent amplifier channels with high output power, high
efficiency, low distortion and a low quiescent current. The amplifier channels can be
connected in the following configurations:
Mono Bridge-Tied Load (BTL) amplifier
Stereo Single-Ended (SE) amplifiers.
SGND1
11
5
signal ground for channel 1
VSSA1
12
6
negative analog supply voltage for channel 1
PROT
13
7
decoupling capacitor for protection (OCP)
VDDP1
14
8
positive power supply voltage for channel 1
BOOT1
15
9
bootstrap capacitor for channel 1
OUT1
16
10
PWM output from channel 1
VSSP1
17
11
negative power supply voltage for channel 1
STABI
18
12
decoupling of internal stabilizer for logic supply
n.c.
19
-
not connected
VSSP2
20
13
negative power supply voltage for channel 2
OUT2
21
14
PWM output from channel 2
BOOT2
22
15
bootstrap capacitor for channel 2
VDDP2
23
16
positive power supply voltage for channel 2
VSSD
24
17
negative digital supply voltage
Table 3:
Pin description …continued
Symbol Pin
Description
TDA8920BTH
TDA8920BJ


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