ST TDA7295 User Manual
®
TDA7295
80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIG H OPERATI NG VOLTAGE R ANGE
(±40V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 80W MUSIC
POWER)
MUTING/STAND- BY FUNC TION S
NO SWITCH ON/OFF NOISE
NO BOUCHEROT CELLS
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
DESCRIPTION
The TDA7295 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, Topclass TV). Thanks to the wide voltage range and
Figure 1: Typical Application and Test Circuit
MULTIPOWER BCD TECHNOLOGY
Multiwatt 15
ORDERING NUMBER:
TDA7295
to the high out current c apability it is able to supply 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.
+VsC7 100nF C6 1000µF
VM
VSTBY
April 2003
R3 22K
C2
R2
22µF
680Ω
C1 470nF
R1 22K
R5 10K
R4 22K
C3 10µF C4 10µF
Note: The Boucherot cell R6, C10, normally not necessary for a stable operation it could
be needed in presence of particular load impedances at V
IN- 2
IN+
IN+MUTE
MUTE
STBY
3
4
10
9
MUTE
STBY
1
STBY-GND
713
-
+
THERMAL
SHUTDOWN
-Vs -PWVs
C9 100nF C8 1000µF
<±25V.
S
+PWVs+Vs
PROTECTION
158
-Vs
S/C
14
OUT
C5
22µF
6
BOOTSTRAP
D93AU011
R6
2.7Ω
C10
100nF
1/13
TDA7295
PIN CONNECTION (Top view)
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
I
O
P
tot
T
op
T
stg
Supply Voltage
S
Output Peak Current 6 A
Power Dissipation T
= 70°C50W
case
Operating Ambient Temperature Range 0 to 70
, TjStorage and Junction Temperature 150
2/13
40 V
±
C
°
C
°
TDA7295
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Thermal Resistance Junction-case Max 1.5
C/W
°
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V
= 50 Ω; T
R
g
= 25°C, f = 1 kHz; unless otherwise specified.
amb
= ±30V, RL = 8Ω, GV = 30dB;
S
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
I
I
V
I
OS
P
Operating Supply Range
S
Quiescent Current 20 30 65 mA
q
Input Bias Current 500 nA
b
Input Offset Voltage +10 mV
OS
Input Offset Current +100 nA
RMS Continuous Output Power d = 0.5%:
O
Music Power (RMS) (*)
∆t = 1s
d Total Harmonic Distortion (**) P
V
= ± 30V, RL = 8
S
V
= ± 26V, RL = 6
S
= ± 22V, RL = 4
ς
S
Ω
Ω
Ω
d = 10%;
R
= 8Ω ; VS = ±34V
L
(***) R
= 4Ω; VS = ±26V
L
= 5W; f = 1kHz
O
P
= 0.1 to 30W; f = 20Hz to 20kHz
O
= ±22V, RL = 4
V
S
P
= 5W; f = 1kHz
O
P
= 0.1 to 30W; f = 20Hz to 20kHz
O
Ω:
10
±
45
45
45
50
50
50
80
80
0.005
0.01
40 V
±
0.1
0.1
W
W
W
W
W
%
%
%
%
SR Slew Rate 7 10 V/µs
G
G
e
, f
f
L
R
SVR Supply Voltage Rejection f = 100Hz; V
T
STAND-BY FUNCTION (Ref: -V
V
ST on
V
ST off
ATT
I
q st-by
MUTE FUNCTION (Ref: -V
V
Mon
V
Moff
ATT
Note (*):
MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)
1 sec after the application of a sinusoidal input signal of frequency 1KHz .
Note (**):
Note (***):
Open Loop Voltage Gain 80 dB
V
Closed Loop Voltage Gain 24 30 40 dB
V
Total Input Noise A = curve
N
f = 20Hz to 20kHz
Frequency Response (-3dB) PO = 1W 20Hz to 20kHz
H
Input Resistance 100 k
i
= 0.5Vrms 60 75 dB
ripple
Thermal Shutdown 145
S
or GND)
S
1
25
Stand-by on Threshold 1.5 V
Stand-by off Threshold 3.5 V
Stand-by Attenuation 70 90 dB
st-by
Quiescent Current @ Stand-by 1 3 mA
or GND)
S
Mute on Threshold 1.5 V
Mute off Threshold 3.5 V
Mute AttenuatIon 60 80 dB
mute
Tested with optimized Application Board (see fig. 2)
Limited by the max. allowable out current
V
µ
V
µ
Ω
C
°
3/13
TDA7295
Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale)
Note:
The Stand-by and Mute functions can be referred either to GND or -VS.
On the P.C.B. is possible to set both the configuration through the jumper J1.
4/13
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