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PDF TDA8920 Data sheet ( Hoja de datos )
| Número de pieza | TDA8920 | |
| Descripción | 2 x 50 W class-D power amplifier | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TDA8920
2 × 50 W class-D power amplifier
Preliminary specification
File under Integrated Circuits, IC01
1998 Dec 01
1 page  
Philips Semiconductors
2 × 50 W class-D power amplifier
Preliminary specification
TDA8920
FUNCTIONAL DESCRIPTION
The TDA8920 is a multi purpose audio power amplifier in
class-D technology. It contains two independent amplifiers
with high output power, high efficiency (90%), low
distortion and a low quiescent current. The amplifiers can
be connected in the following configurations:
• Mono bridge-tied load amplifier
• Stereo single-ended amplifiers.
The amplifier can be switched in three operating modes
with the mode select input:
• Standby mode, with a very low supply current
(practically zero)
• 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 plop noise the amplifier will remain
automatically for approximately 500 ms in the mute
mode before switching to operating mode. During this
time the coupling capacitors at the input are fully
charged. An example of a switching circuit for driving the
mode select input is illustrated in Fig.3.
Pulse Width Modulation (PWM) frequency
The output signal of the amplifier is a PWM signal with a
sample frequency of 500 kHz. The use of a second order
LC filter in the application results in an analog audio signal
across the loudspeaker. This switching frequency is fixed
by an external resistor ROSC connected between pin OSC
and pin SGND. With the resistor value given in the
application diagram, the oscillating frequency is typical
500 kHz. The oscillator frequency can be calculated using:
Current limiting
With an external resistor RLIM connected between pin LIM
and VSS the maximum output current of the amplifiers can
be set. If pin LIM is short-circuited to VSS, then the
maximum output current is limited to 7 A. The relationship
between maximum output current and resistor value is
given by:
IO(max)
=
-------------7----0---.--1---0---3-------------- [A]
10.103
+
RLIM
Protections
Protections are included to avoid the device being
damaged at:
• Over-temperature Tj > 150 °C
• Short-circuit of the loudspeaker terminals: when
short-circuited the power dissipation is limited
• A maximum current limiter which limits the maximum
output current to 7 A, or to the value set by RLIM. During
limiting the current is measured and when the current is
higher than 7 A, the amplifier is switched off within 3 µs
and every 20 ms the IC tries to restart. The dissipation
will be low because of this low duty cycle.
• ESD protection (human body model: 3000 V and
machine model: 300 V).
handbook, halfpage +5 V
fosc = 5-R---.-O-1---S0---C9- [ Hz]
If two or more devices are used in the same audio system
it is advised to have both devices working on the same
oscillation frequency. This can be realized by connecting
all OSC pins together.
standby/on
mute
R
pin MODE
R
SGND
MGR660
Fig.3 Mode select input drive circuit.
1998 Dec 01
5
5 Page 
Philips Semiconductors
2 × 50 W class-D power amplifier
Preliminary specification
TDA8920
handbook, full pagewidth
VDD
VDD2 VDD1
13 5
6 BOOT1
100
nF
100 nF
IN1+ 4
CBOOT1
47 nF
Vi 100 nF
IN1− 3
ANALOG
DIGITAL
7 OUT1
100 µH
390
nF
LIM 16
PROTECTION
VSS1
TDA8920J
12 BOOT2
RLIM
IN2+ 14
VDD2
CBOOT2
47 nF
ANALOG
IN2− 15
DIGITAL
11 OUT2
100 µH
390
nF
VSS2
MODE 17
9 STAB
MODE OSCILLATOR STABILIZER
Vms
2
SGND
1
OSC
8 10
VSS1 VSS2
CSTAB
100
nF
ROSC
10 kΩ
VSS
SGND
2200
µF
25 V
8Ω
SGND
0V
2200
µF
25 V
MGR664
Maximum value of CBOOT = tbf nF.
Filter coil is type tbf, Rs < tbf Ω.
The case of the package is internally connected to VSS.
Fig.6 Application circuit for mono bridge-tied load application (SOT243-1).
1998 Dec 01
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TDA8920.PDF ] | |
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