Amplifier 100 watt TDA 7294

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Amplifier 100W TDA7294 Audio

TDA7294 adalah, terpadu monolitik, Kelas AB penguat audio yang dirancang khusus untuk Hi-Fi aplikasi. IC memiliki tahap DMOS output dan dapat memberikan 100W RMS menjadi pembicara 8Ohm pada pasokan + /-38V ganda. TDA7294 ini memiliki kebisingan rendah, distorsi rendah, penolakan riak yang baik dan dapat dioperasikan dari berbagai suplai tegangan. IC telah dibangun di perlindungan sirkuit pendek dan circuitries thermal shutdown. IC tersedia dalam multiwatt 15V dan paket 15H multiwatt.

Deskripsi

Dalam rangkaian TDA7294 dikonfigurasi untuk memberikan daya output 100W menjadi loudspeaker 8Ohm di + / - 38V pasokan. C8 adalah kapasitor kopling input dan input diterapkan pada masukan non-inverting (Pin3) dari IC. C3 dan C9 adalah kapasitor catu daya filter sedangkan C10 dan C4 adalah kapasitor bypass. C2 adalah kapasitor bootstrap. RC jaringan yang terdiri dari R1 dan C1 meningkatkan stabilitas penguat frekuensi tinggi dan juga mencegah osilasi. R2 dan C6 menetapkan waktu bisu konstan sementara R3 dan C5 menetapkan waktu siaga konstan. S1 dan S2 bisu saklar dan saklar siaga adalah. R5 adalah resistansi input dan impedansi input amplifier memiliki hubungan langsung dengan nilainya. R4 dan R6 digunakan untuk pengaturan jenis gain loop tertutup dan dengan nilai yang digunakan, gain 30dB. C2 adalah sebuah kapasitor umpan balik dan juga menyediakan decoupling DC.

Circuit Diagram

TDA7294 100W penguat
Catatan.
Rentang tegangan suplai + / - 10V untuk = /-40V DC.
Heat sink diperlukan dan tahan panas yang akan menjadi sekitar 0,038 derajat Celcius / Watt.
Gunakan speaker 8 Ohm 150W sebagai beban.
Untuk output 100W tegangan suplai harus + /-38VDC.
Catu daya harus disaring dengan baik dan bebas dari riak.
Jika riak hadir di power supply dapat menyebabkan osilasi.
VM = 1.5V adalah bisu ON ambang batas dan VM = 3.5V adalah ambang batas OFF bisu.
VSTBY = 1.5V adalah siaga pada ambang dan VSTBY = 3.5V adalah ambang batas OFF siaga.
Resistansi masukan Khas TDA7294 adalah 100KiloOhm.
Respon frekuensi 20Hz sampai 20KHz.
145 derajat Celsius adalah ambang batas untuk shutdown termal. Laju perubahan tegangan dari TDA7294 adalah 10V/microsecond dan gain tegangan loop terbuka adalah 80 dB.
Arus diam dari TDA7294 adalah sekitar 30mA dan nilai maksimum adalah 65mA.
www.circuitstoday.com

100 watt Amplifier for Car

100W Quad Car Amplifier

 This quad ?nal amplifier is actually intended to be used in a car, but it can naturally also be used for a variety of other medium-power applications. The TDA7375A can be successfully used in all situations in which a reasonable amount of audio power is desired and only a relatively low supply voltage is available. This IC is the successor to the TDA7374B, which forms the heart of the active loudspeaker system described earlier this year. Such a quad IC amplifier is naturally an excellent choice for this application, especially since the individual amplifiers can be connected in pairs in the bridge con?guration, which allows them to provide approximately four times as much power.The new IC can handle a peak voltage of 50 V (10 V more than the TDA7374B), but what is more important is that it is also truly intended to be used for single-ended operation. It includes all imaginable types of protection in order to avoid the premature demise of the four amplifiers, and in fact it is ideally suitable for a ‘no-nonsense’ mini surround-sound system. For more information about the TDA7375A, we refer you to its data sheet, which can be found at www.st.com. The circuit shown here has four trimpots for individually setting the output levels of the amplifiers.

In addition, all inputs have RC networks (R1/C1, etc.) to block possible RF interference. The function of R6 is to separate the grounds of the input and output stages, in order to avoid possible ground loops that might arise with the use of multiple modules. A 5-W type is used for this resistor, in order to prevent it from going up in smoke if the ground connection of the power supply comes loose. C10 decouples the internal voltage divider, which biases the internal amplifier stages to half of the supply voltage. RC network R5/C9 provides a delayed, plop-free switch-on.

C15 and C16 are local bypass capacitors for the supply voltage. The power supply ripple rejection of the TDA7375A is approximately 50 dB. If you want to use only a transformer, bridge rectifier and smoothing capacitor for the power supply, the minimum requirement is a transformer rated at 12 V / 30 VA in combination with a 10,000-µF electrolytic capacitor (remember that the maximum allowable supply voltage is 18 V). One of the few drawbacks of this quad ampli?er is that two of the channels are inverted with respect to the other two. For this reason, the polarity of each loudspeaker terminal is marked on the circuit board layout (e.g., +LS1 and –LS4) to indicate which terminal of the loudspeaker should be connected where.

Radial electrolytic capacitors rated at 3300µF/16V and having a diameter of only 12 mm are used for the output capacitors, which allows the circuit board to remain relatively compact. Our preferred type of electrolytic capacitor is a member of the Rubycon ZL series, which can handle no less than 3.4 A of ripple current. The maximum current consumption of the circuit with all four channels driven to the clipping level (with 4-? loads) is approximately 2.1 A. The TDA7375A can also be used with 2-? loads. However, in this case the internal temperature rises considerably, since the Multiwatt 15V package has a rather large thermal impedance of 1.8 ºC/W.

In the interest of the service life of the IC, it is thus a good idea to use a somewhat larger heat sink. A 4 A/T fuse has been selected in consideration of possible 2-? operation. If you limit the load to 4 ?, the fuse value can be reduced to 2 A/T. The output terminals of the ampli?ers can be found on the circuit board next to the associated electrolytic capacitors. The related ground connections for LS1 and LS2 are located next to the LS1 and LS2 terminals, but the ground connections for LS3 and LS4 are located on the left, next to the IC, since this gives the best current paths on the circuit board and the least distortion. Vertical car connectors (spade terminals) are used for the power supply connections.

Resistors:
R1-R4 = 100?
R5 = 10k?
R6 = 0?1, 5W
P1-P4 = 10 k preset
Capacitors:
C1,C3,C5,C7 = 15nF
C2,C4,C6,C8 = 220nF
C9 = 10µF 63V radial
C10 = 47µF 25V radial
C11-C14 = 3300µF 16V
C15 = 100nF
C16 = 1000µF 25V radial, max. diameter 13mm
Semiconductors:
IC1 = TDA7375A (ST)
Miscellaneous:
F1 = fuse, 4A/T (time lag), with PCB mount holder 2 fast-on (spade) terminal, male, vertical, solder type (2-pin version)
Measurement results
Supply voltage = 14.4 V
Quiescent current = 100 mA
Pmax. (0.1% THD) = 4 x 5.3 W/ 4?
Input sensitivity = (5.2 W/4 ?) 0.5 V
THD+N (B = 80 kHz, 1 kHz 1W/4 ?) = < 0.04 % Bandwidth = 28 Hz to 55 kHz
source   extremecircuit.net