TDA8920TH NXP Semiconductors, TDA8920TH Datasheet - Page 7

• Manufacturer Part Number: TDA8920TH
• Manufacturer: NXP Semiconductors

Specifications of TDA8920TH

• Operational Class: Class-D
• Output Power (typ): 140x1@8Ohm/80x2@4OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.02@8Ohm@1W%
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): ±25V
• Power Supply Requirement: Dual
• Rail/rail I/o Type: No
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): ±12.5V
• Dual Supply Voltage (max): ±30V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
8
8.1
The TDA8920 is a two channel audio power amplifier using
class-D technology. A typical application diagram is
illustrated in Fig.37. A detailed application reference
design is given in Section 16.8. 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 loudspeaker.
The TDA8920TH 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 TDA8920TH 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 TDA8920TH contains two independent amplifier
channels with high output power, high efficiency (90%),
low distortion and a low quiescent current. The amplifier
channels can be connected in the following configurations:
2002 Sep 25
Mono Bridge-Tied Load (BTL) amplifier
Stereo Single-Ended (SE) amplifiers.
2
FUNCTIONAL DESCRIPTION
General
80 W class-D power amplifier
7
The amplifier system can be switched in three operating
modes with the MODE select pin:
For suppressing plop noise the amplifier will remain,
automatically, in the mute mode for approximately 150 ms
before switching to operating mode; see Fig.4. In this time
the coupling capacitors at the input are fully charged.
An example of a switching circuit for driving the mode pin
is illustrated in Fig.3.
handbook, halfpage
Standby mode; with a very low supply current
Mute mode; the amplifiers are operational, but the audio
signal at the output is suppressed
Operating mode (amplifier fully operational) with output
signal.
Fig.3 Example of mode select circuit.
standby/
5 V
mute
R
R
Product specification
mute/on
MODE pin
SGND
MBL463
TDA8920