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PDF TDA8920TH Data sheet ( Hoja de datos )
| Número de pieza | TDA8920TH | |
| Descripción | Class-D audio amplifier 2 x 80W Single chip | |
| Fabricantes | Philips | |
| Logotipo |  |
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Philips Semiconductors
TDA8920TH
2 x 80 W class-D audio amplifier
October 23, 2001 Objective specification
Version : 1.1
TDA8920TH
Class-D audio amplifier 2 x 80W
Single chip
1. General description
The TDA8920 is a high efficiency class-D audio power amplifier. Typical output power is 2 x 80 W and it operates with
high efficiency and very low dissipation. The device comes in a HSOP24 power package with a small internal heatsink.
Depending on supply voltage and load conditions a very small or even no external heatsink is required. The amplifier
operates over a wide supply voltage range from +12.5 up to =+30 V and consumes a very low quiescent current.
2. Features
- High efficiency (~90%)
- Operating voltage from +12.5 V to + 30V
- Very low quiescent current
- Low distortion
- Usable as a stereo Single-Ended (SE) amplifier or
as a mono amplifier in Bridge-Tied Load (BTL)
- Fixed gain of 30 dB in Single Ended (SE) and 36 dB in Bridge-Tied-Load (BTL)
- High output power
- Good ripple rejection
- Internal switching frequency can be overruled by an external clock
- No switch-on or switch-off plop noise
- Short-circuit proof across the load
- Electrostatic discharge protection
- Thermally protected
3. Applications
- Television sets
- Home-sound sets
- Multimedia systems
- All mains fed audio systems
- Car audio (boosters)
Objective specification / 10 october 2001 / version:1.1
1
1 page  
Philips Semiconductors
8. Functional description
TDA8920TH
2 x 80 W class-D audio amplifier
8.1 General
The TDA8920TH is a two channel audio power amplifier using class-D technology. A typical application schematic
is given in figure 4. In section 15.2.8 a detailled application reference design is provided. Via an analog input stage
and PWM modulator the audio input signal is converted into a digital PWM signal. To drive the output power transistors
this digital PWM signal is applied to a control and handshake block and driver circuits for both highside and lowside.
In this way a level shift is performed from the low power digital PWM signal at logic levels to a high power PWM signal
switching between the main supply lines.
A second 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 on the chip.
The two audio channels of the TDA8920TH contain two pulse width modulators (PWM), two analog feedback loops
and two differential input stages. Furthermore it contains circuits common to both channels like 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:
- Mono bridge-tied load (BTL) amplifier
- Stereo single-ended (SE) amplifiers.
The amplifier system can be switched in three operating modes with the MODE select pin:
- 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.
For suppressing pop noise the amplifier will remain automatically in the mute mode for approx.150ms before
switching to operating (see also figure 5). In this time the coupling capacitors at the input are fully charged. See fig. 3
for an example of a switching circuit for driving the mode pin.
+5V
standby/
mute
R
R
mute/on
MODE pin
SGND
Figure 3: Example of mode select circuit
Objective specification / 10 october 2001 / version:1.1
5
5 Page 
Philips Semiconductors
TDA8920TH
2 x 80 W class-D audio amplifier
12. Static characteristics
Vp = +25 V; Tamb = 25 °C; measured in Fig. 8; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
Supply
Vp supply voltage range
Iq quiescent current
Istb standby current
Mode select pin
note 1
no load connected
+12.5
-
-
Vms
Ims
Vstandby
input voltage range
input current
input voltage range mode select
for standby mode
note 2
Vms = 5.5 V
note 2, 3
Vmute
input voltage range mode select note 2, 3
for mute mode
Von input voltage range mode select note 2, 3
for on mode
Audio input pins
VinDC
DC input level
Amplifier outputs
note 2
VOOSE
output offset voltage
single-ended (SE)
on and mute
∆VOOSE delta output offset voltage
single-ended (SE)
on ↔ mute
VOOBTL output offset voltage
bridge-tied- load (BTL)
on and mute
∆VOOBTL delta output offset voltage
bridge-tied-load (BTL)
on ↔ mute
Stabilizer
Vstabi
Stabilizer output voltage
mute and operating
note 4
Temperature protection
Tprot
Thys
Temperature protection activation
Hystereses on temperature
protection
0
-
0
2.0
4.2
-
-
-
-
11
150
-
Notes
1. The circuit is DC adjusted at Vp = +12.5 to +30 V.
2. With respect to SGND (0 V).
3. The transition regions between standby-mute-on contain hystereses (see fig. 7)
4. With respect to VSS
TYP. MAX. UNIT
+25 +30 V
55 75 mA
100 500 µA
- 5.5 V
- 1000 µA
- 0.8 V
- 2.8 V
- 5.5 V
0V
- 150 mV
- 80 mV
- 215 mV
- 115 mV
13 15 V
--
20 -
oC
oC
Objective specification / 10 october 2001 / version:1.1
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA8920TH.PDF ] | |
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