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power amplifier. BRUTUS170S Datasheet

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power amplifier. BRUTUS170S Datasheet






BRUTUS170S amplifier. Datasheet pdf. Equivalent




BRUTUS170S amplifier. Datasheet pdf. Equivalent





Part

BRUTUS170S

Description

stereo power amplifier



Feature


USER MANUAL AX ELEKTRONIKA d.o.o. BRUT US 170W / S stereo power amplifier BRUT US - 170W/S is stronger brother of the popular BRUTUS - 100W/S power amplifier . BRUTUS - 170W/S is operating in the b ridge configuration, which ensures such a high output. Thanks to IC TD A7294 manuf actured b y SGS or few Thompson ( www.st.com) that you can buy f Euros yo u can make a compa.
Manufacture

ETC

Datasheet
Download BRUTUS170S Datasheet


ETC BRUTUS170S

BRUTUS170S; ct 170W power amplifier. It’s PCB meas ures just 5,5 x 21 cm. TDA7294 is house d in Multiwatt 1 5 package and is inten ded for audio power amplifiers operatin g in class AB. It’s usable in wide ar ea of applications, from Home Cinema sp eak er systems to active speak ers, hig h-end T V se ts and of cour se home bre w am plifier projects. Due to it’ s l arge power supply voltag.


ETC BRUTUS170S

e range is this IC capable of delivering large power to 4, 8 and 1 6 Ohms speak ers. TDA7294 has 100W output power at R L = 8 Ohms; VS = ± 38V , and 100W at R L = 4 Ohms; VS = ± 29V . THD is lower than 0,1% at PO = 0. 1 to 50W and f = 2 0Hz to 20kHz. De tailed information on power output and THD can be seen in dia grams. Let us f irstly list basic dat a about TD A7249 in t.


ETC BRUTUS170S

able 1. Special attention should be paid f or the max. power supply voltage whi ch should not ex- ceed ± 49V. In case that v oltage exceeds ± 49V your TDA7 294 will silently burn out. In the ampl ifier circuit are f our pieces of TD A7 294. It means that we might find out th at all f our ICs are dead as Dodo! Take a look also at table 2, where technica l data for TDA7294 a.

Part

BRUTUS170S

Description

stereo power amplifier



Feature


USER MANUAL AX ELEKTRONIKA d.o.o. BRUT US 170W / S stereo power amplifier BRUT US - 170W/S is stronger brother of the popular BRUTUS - 100W/S power amplifier . BRUTUS - 170W/S is operating in the b ridge configuration, which ensures such a high output. Thanks to IC TD A7294 manuf actured b y SGS or few Thompson ( www.st.com) that you can buy f Euros yo u can make a compa.
Manufacture

ETC

Datasheet
Download BRUTUS170S Datasheet




 BRUTUS170S
USER MANUAL
AX ELEKTRONIKA d.o.o.
BRUTUS 170W / S
stereo power amplifier
BRUTUS - 170W/S is stronger brother of the popular BRUTUS - 100W/S power
amplifier. BRUTUS - 170W/S is operating in the bridge configuration, which ensu-
res such a high output.
Thanks to IC TD A7294 manuf actured b y SGS
Thompson (www.st.com) that you can buy for few
Euros you can make a compact 170W power am-
plifier. It’s PCB measures just 5,5 x 21 cm.
TDA7294 is housed in Multiwatt 15 package and
is intended for audio power amplifiers operating
in class AB. It’s usable in wide area of applica-
tions, from Home Cinema speaker systems to ac-
tive speak ers, high-end T V se ts and of cour se
home brew am plifier projects. Due to it’ s large
power supply voltage range is this IC capable of
delivering large power to 4, 8 and 16 Ohms spea-
kers. TDA7294 has 100W output power at RL =
8 Ohms; VS = ± 38V, and 100W at RL = 4 Ohms;
VS = ± 29V. THD is lower than 0,1% at PO = 0.1
to 50W and f = 20Hz to 20kHz. De tailed infor-
mation on power output and THD can be seen
in diagrams.
Let us f irstly list basic dat a about TD A7249 in
table 1. Special attention should be paid f or the
max. power supply voltage which should not ex-
ceed ± 49V. In case that v oltage exceeds ± 49V
your TDA7294 will silently burn out. In the am-
plifier circuit are f our pieces of TD A7294. It
means that we might find out that all four ICs are
dead as Dodo! Take a look also at table 2, where
technical data for TDA7294 are listed.
Another important issue is speak er impedance.
Speaker should ha ve min. 8 Ohms impedance.
Just for illustration, with Vss of just ± 25V and 8
Ohms speakers output power reaches 150W, whi-
le at Vss = ± 35V and 1 6 Ohms speaker we can
reach output po wer of respect able 170W! You
may ask yourself what can happen if instead of 8
Ohms speakers 4 Ohms ones are used? Well, not
much if TD A7294 is concer ned. Amplif ier will
deliver max. output po wer to 4 Ohms speak ers
limited time until ICs overheat. Due to IC’s ther-
mal protection circuitry TDA7294 will automati-
cally reduce output power to safe value.
Schematic diagram of the BRUTUS - 170W/S po-
wer amplifier can be seen at fig. 2
Table 2: Electrical characteristics
Table 1: Absolute maximum ratings
1
DMOS 170W schematic
As mentioned ear lier, BRUTUS -
170W/S is configured in the brid-
ge conf iguiration. One of it’s ad-
vantages is that there is no output
capacit or which im proves fre-
quency response of am plif ier.
With the swit ch S1 MUTE or
PLAY mode are selected.
Let us now take a look at IC itself. TDA7294 has
4 main parts: MUTE circuitry with Stand-by func-
tion, preamplifier circuitry, power output s tage
and short protection circuitry. TDA7294 has built-
in protection from the shor t circuit on the out-
put terminals. It has also thermal
protection which tur ns off output
stage, when silicon die reaches
145°C.
Power supply is blocked with 100n-
F capacitors near ICs. T ogether
with 2.200 µF filter capacitors en-
sures a clean po wer supply v olta-
ge for IC . Le t us emphasiz e that
2.200 µF capacit ors that are pla-
ced near IC are here purely to im-
prove 100 Hz filtering while main
filtering must be done with 10.000
µF capacitors that are located on
power supply PCB.
Resistors R2 and R3 (R12 and R15
respectively) set the am plification
of the circuit. With values that you
see in the schematic diagr am am-
plification is set to 30 dB. Capaci-
tor C9 sets the low frequency cut-
off therefore lowering value of C9
should be done carefully. If you lo-
wer capacitance of C9 the low fre-
quency cut-off will be higher which
means that lower tones will be at-
tenuated. Lowering capacitance of
decoupling capacitor C3 will cau-
se same effect as changing value of
C9. Input resistance is set with R1,
which should be same as R2.
Electrical schematic of BRUTUS -
170W/S is a bit different from the
original application note. Differen-
ce is at the MUTE and STAND-BY
pins, that are connected to one
switch S1.
To reach max. attenuation MUTE
switch S1 should be connected t o
GND, while for normal operation
it should be connected to +Vcc.
Power supply
Power supply of this am plifier is
simple. You should use centre-tap-
ped transf ormer with 2x2 7V A Chttp://www.Datasheet4U.com




 BRUTUS170S
Table 3: The recommended values of the external components (reffers to original application note at fig. 1)
Figure 1: Typical application circuit
2
Figures 3: Output Power vs. Supply Voltage.
Figures 5: Diagram of MUTE function
Figures 3: Distortion vs. Output Power
outputs. Transformer should be r ated at 500W
min. if you want to achieve full 170W stereo out-
put power from all ICs. Use suitable bridge recti-
fier rated at 35A min. We suggest to use a recti-
fier which can be easily screwed to amplifier enc-
losure. At po wer supply PCB y ou should use 4
pcs. of 1 0.000 µF capacit ors ho wever, y ou can
use only 2 pcs. of 1 0.000 µF if hum is at accep-
table level. 100nF capacitors are added to redu-
ce high frequency noice. Note that power supply
has separate PCB and is not included on the
BRUTUS - 1 70W/S PCB! T o pre vent too high
inrush current at powering up torodial transfor-
mer we recommend to mak e s simple circuit as
indicated in the schematic diagarm (figure 2). The
circuit consists of resistor RS and switch S2. Re-
sistor should have 390 Ohms/ 2W. At powering
up the amplifier resistor limits inrush current to
a safe value. Few seconds after turning power on
you can close switch S2 which will enable nor -
mal oper ation of am plifier. All of y ou that are
good in electronics will probably make a time re-
lay, which will aut omatically af ter f ew seconds
short resistor RS. In case that you do not wish to
use this simple protective circuit you will probably
change fuses quite often. On Fig. 6 y ou can see
schematics of simple time delay circuit. This cir-
cuit can be built on prototype veroboard. In the
circuit the BS170 N-type MOSFET transistor is
used. To it’s Gate the capacitor Cs is connected.
Cs together with Rs makes an RC circuit, which
determines time delay, at which transistor T1 will
turn on relay. Resistor Rp determines discharge
time of Cs. This resistor is here because Cs can-
not discharge itself through MOSFET due to high
input resist ance of Gate ter minal. If Cs w ould
not discharge, T1 would remain open also when
we turn off power supply, which would mean that
at next powering up the RS will be shor ted and
will not function as a pr otection for your trans-
former. Zenner diode D1 is needed to drop sup-
ply voltage to a safe value. Instead of zenner dio-




 BRUTUS170S
Fig. 2: Schematic of the BRUTUS - 170W/S power amplifier
3



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