1. Introduction
The TDA8947J contains four identical audio power amplifiers. The TDA8947J can be used as:
Four single-ended (SE) channels with a fixed gain of 26dB
, bridged load with a fixed gain of 32dB
BTL) dual channel, or SE dual channel
(gain 26 dB) and one BTL channel (gain 32
for use as a 2.1 system
dB). The TDA8947J is available in a 17-pin Dil-
Bent-Sil (DBS) power package.
The TDA8947J is pin-out compatible with the TDA8944AJ and
TDA8946AJ. The TDA8947J
contains a unique protection circuit that is
relevant only to the measured
values ??of multiple temperatures inside the chip. This provides maximum output power for all supply voltage and load conditions without unnecessary audio holes. As long as the thermal boundary conditions
(number of channels used, external heat sink and ambient
ambient temperature) allow, almost any control of the source voltage and load can be achieved impedance in any combination.
TDA8947J is equipped with Philips' patented overload protection technology, which can protect the amplifier from overloading
or using external speakers
< p>Under extreme conditions such as low load impedance, the TDA8947J has the ability to prevent the occurrence of no audio signal zone. The TDA8947J includes a 4channel amplifier that can be used to expand the sound of a simple 2.1
system amplifier or build a 5.1 system using only two chips
—— The bill of materials for the 5.1 system
can be reduced by more than 2/3. The voltage range of 9V to 28V allows the TDA8947J to be used in a wide range of applications with simple power supply structures.
This feature, combined with its high supply voltage range
makes the TDA8947J suitable for applications where Asian manufacturers have global leadership positions, such as
p>
Home theater, PC speakers, LCD, plasma
and CRT TV, etc. Furthermore, these features
combined with its low cost make the TDA8947J an ideal solution to achieve
a high cost performance. Able to
output 4x25W or 2x15W+1x50W (2.1
systems) mixed, this single-chip solution also
provides switching control circuits for a variety of applications
A simple interface.
2. Features
■ SE: 1 W to 25 W, BTL: 4 W to
50 W operating range (2.1 system)
■ Flexible peak shearing
■ Standby and silent mode
■ No on/off switching sound
■ Low standby current
■ High supply voltage ripple removal
■ Input and output short-circuit protection for ground, power and jumper loads
■ Thermal protection
■ Pin-compatible with TDA8944AJ and TDA8946AJ