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PDF TDA7294 Data sheet ( Hoja de datos )
| Número de pieza | TDA7294 | |
| Descripción | 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY | |
| Fabricantes | ST Microelectronics | |
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® TDA7294
100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIGH OPERATING VOLTAGE RANGE
(±40V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 100W MU-
SIC POWER)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
NO BOUCHEROT CELLS
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
DESCRIPTION
The TDA7294 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top-
class TV). Thanks to the wide voltage range and
Figure 1: Typical Application and Test Circuit
MULTIPOWER BCD TECHNOLOGY
Multiwatt15V
Multiwatt15H
ORDERING NUMBERS:
TDA7294V
TDA7294HS
to the high out current capability it is able to sup-
ply the highest power into both 4Ω and 8Ω loads
even in presence of poor supply regulation, with
high Supply Voltage Rejection.
The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
VM
VSTBY
C7 100nF
+Vs C6 1000µF
R3 22K
C2
22µF
R2
680Ω
IN- 2
C1 470nF
IN+ 3
R1 22K
IN+MUTE
4
R5 10K MUTE 10
MUTE
STBY 9
STBY
R4 22K
1
+Vs
7
-
+PWVs
13
14 OUT
+ C5
22µF
6
BOOT-
STRAP
THERMAL
SHUTDOWN
8
S/C
PROTECTION
15
C3 10µF
C4 10µF
STBY-GND
-Vs
C9 100nF
-PWVs
C8 1000µF
D93AU011
-Vs
Note: The Boucherot cell R6, C10, normally not necessary for a stable operation it could
be needed in presence of particular load impedances at VS <±25V.
R6
2.7Ω
C10
100nF
April 2003
1/17
1 page  
TDA7294
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1)
The recommended values of the external components are those shown on the application circuit of Fig-
ure 1. Different values can be used; the following table can help the designer.
COMPONENTS SUGGESTED VALUE
PURPOSE
LARGER THAN
SUGGESTED
SMALLER THAN
SUGGESTED
R1 (*)
22k INPUT RESISTANCE INCREASE INPUT DECREASE INPUT
IMPRDANCE
IMPEDANCE
R2
R3 (*)
680Ω
22k
CLOSED LOOP GAIN DECREASE OF GAIN INCREASE OF GAIN
SET TO 30dB (**)
INCREASE OF GAIN DECREASE OF GAIN
R4
22k
ST-BY TIME
LARGER ST-BY
SMALLER ST-BY
CONSTANT
ON/OFF TIME
ON/OFF TIME;
POP NOISE
R5
10k
MUTE TIME
LARGER MUTE
SMALLER MUTE
CONSTANT
ON/OFF TIME
ON/OFF TIME
C1
0.47µF
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2
22µF
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3
10µF
MUTE TIME
LARGER MUTE
SMALLER MUTE
CONSTANT
ON/OFF TIME
ON/OFF TIME
C4
10µF
ST-BY TIME
LARGER ST-BY
SMALLER ST-BY
CONSTANT
ON/OFF TIME
ON/OFF TIME;
POP NOISE
C5
22µF
BOOTSTRAPPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8
1000µF
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
C7, C9
0.1µF
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE ≥ 24dB
5/17
5 Page 
Figure 19: P.C.B. and Components Layout of the Circuit of figure 18 (1:1 scale)
TDA7294
diodes Z1,Z2 and resistors R7,R8 define the mini-
mum drop across the power MOS transistors of
the TDA7294. L1, L2, L3 and the snubbers C9,
R1 and C10, R2 stabilize the loops formed by the
"bootstrap" circuits and the output stage of the
TDA7294.
In figures 21,22 the performances of the system
in terms of distortion and output power at various
frequencies (measured on PCB shown in fig. 19)
are displayed.
The output power that the TDA7294 in high-
efficiency application is able to supply at
Vs = +40V/+20V/-20V/-40V; f =1 KHz is:
- Pout = 150 W @ T.H.D.=10 % with Rl= 4 Ohm
- Pout = 120 W @ " = 1 % " " "
- Pout = 100 W @ " =10 % with Rl= 8 Ohm
- Pout = 80 W @ " = 1 % " " "
Results from efficiency measurements (4 and 8
Ohm loads, Vs = ±40V) are shown by figures 23
and 24. We have 3 curves: total power dissipa-
tion, power dissipation of the TDA7294 and
power dissipation of the darlingtons.
By considering again a maximum average
output power (music signal) of 20W, in case
of the high efficiency application, the thermal
resistance value needed from the heatsink is
2.2oC/W (Vs =±40 V and Rl= 4 Ohm).
All components (TDA7294 and power transistors
T1 and T2) can be placed on a 1.5oC/W heatsink,
with the power darlingtons electrically insulated
from the heatsink.
Since the total power dissipation is less than that
of a usual class AB amplifier, additional cost sav-
ings can be obtained while optimizing the power
supply, even with a high headroom.
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet TDA7294.PDF ] | |
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