TDA7262 - STMicroelectronics

TDA7262
®
20+20W STEREO AMPLIFIER WITH STAND-BY
WIDE SUPPLY VOLTAGE RANGE
HIGH OUTPUT POWER
28+28W TYP. MUSIC POWER
20+20W @ THD = 10%, RL = 4Ω, VS = 28V
HIGH CURRENT CAPABILITY (UP TO 3.5A)
STAND-BY FUNCTION
AC SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
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DESCRIPTION
The TDA7262 is class AB dual Hi-Fi Audio power
amplifier assembled in Multiwatt package, specilally designed for high quality stereo application
as Hi-Fi music centers and TV sets.
MULTIWATT11
ORDERING NUMBER: TDA7262
Figure 1: Stereo Application Circuit with Stand-By
September 2003
1/8
TDA7262
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
VS
Supply Voltage
35
IO
Output Peak Current (repetitive f > 20Hz)
3.5
A
IO
Output Peak Current (non repetitive, t > 100µs)
4.5
A
Ptot
Tstg, Tj
Power Dissipation (Tcase = 70°C)
Storage and Junction Temperature
30
W
-40 to 150
°C
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PIN CONNECTION
TEST CIRCUIT
2/8
TDA7262
THERMAL DATA
Symbol
Rth j-case
Description
Thermal Resistance Junction-case
Value
Unit
2.5
°C/W
Max
ELECTRICAL CHARACTERISTICS (Refer to the stereo test circuit, VS = 28V; f = 1KHz; Tamb = 25°C,
unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
VS
Supply Voltage
VO
Quiescent Output Voltage
VS = 32V
8
15.5
Id
Total Quiescent Current
VS = 28V
VS = 32V
65
70
PO
Output Power (each channel)
Music Power STD rules (T = 1s)
VS = 32V; d = 10%; RL = 4Ω
d = 10%
RL = 4Ω
RL = 8Ω
d = 1%
RL = 4Ω
RL = 8Ω
d
Total Harmonic Distortion
CT
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b
f = 100Hz to 10KHz
PO = 0.1 to 14W; RL = 4Ω
PO = 0.1 to 8W; RL = 8Ω
O
)
Cross Talk
RL = 4Ω RS = 100Ω
f = 1KHz
f = 10KHz
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-
Max.
Unit
32
V
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uc
120
od
Pr
10
28
22
13
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d
mA
mA
W
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t(
W
W
18
10
W
W
0.2
0.1
%
%
60
50
dB
dB
200
KΩ
o
r
P
Vi
Input Saturation Voltage
Ri
Input Resistance
fL
Low Frequency roll-off (-3dB)
RL = 4Ω
40
Hz
fH
High Frequency roll-off (-3dB)
RL = 4Ω
80
KHz
GV
Closed Loop Voltage Gain
f = 1KHz
u
d
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(Vrms)
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∆GV
Closed Loop Gain match
eN
Total Input Noise Voltage
s
b
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SVR
f = 1KHz; non inverting Input
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Supply Voltage Rejection
(each channel)
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Tj
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300
70
35.5
mV
36
36.5
0.5
dB
dB
µV
A Curve; RS = 10KΩ
1.5
f = 22Hz to 22KHz; RS = 10KΩ
2.5
RS = 0 to 10KΩ; fr = 100Hz
Vr = 0.5V
55
dB
145
°C
Thermal Shutdown Junction
Temperature
8
µV
STAND-BY FUNCTION
V3
Stand-By Threshold
VS = 32V
AM
IM
Stand-By Attenuation
Stand-By Quiescent Current
VS = 32V; V3 < 0.45V
VS = 32V; V3 < 0.45V
0.45
0.9
V
60
100
3
dB
mA
5
3/8
TDA7262
APPLICATION SUGGESTION
The recommended values of the components are those shown on application circuit of Figure 1. Different values can be used; the following table can help the designer.
Component
Recomm.
Value
R1 and R3
1.3KΩ
R2 and R4
18Ω
R5 and R6
1Ω
C1 and C2
2.2µF
Purpose
Close loop gain setting (*)
Larger than
Smaller than
Increase of gain
Decrease of gain
Decrease of gain
Increase of gain
Frequency stability
Danger of oscillations
Input DC decoupling
higher turn-on delay
- worse turn-ON pop
- higer low freq. cutoff.
Increase of noise
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C3
22µF (**)
- Ripple rejection
- Stand-by time constant
Increase of the
Switch-on time
- Degradation of SVR
- worse turn-OFF pop by
stand-by
C4
100nF
Supply setting
Danger of oscillations
C5
1000µF
Supply setting
worse turn-OFF pop
C6 and C7
220µF
Feedback input DC
decoupling
C8 and C9
C10 and C11
0.1µF
1000µF to
2200µF
Frequency stability
Danger of oscillations
Output DC decoupling
Higher low-frequency
cut-off
(*) Closed loop gain must be higher than 26dB.
(**) 220µF in case of stand-by utilization.
Figure 2: Ouput Power vs. Supply Voltage
4/8
Figure 3: Ouput Power vs. Supply Voltage
TDA7262
Figure 4: Distortion vs. Ouput Power
Figure 5: Distortion vs. Ouput Power
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Figure 6: Quiescent Current vs. Supply Voltage
Figure 7: Supply Voltage Rejection vs. Frequency
Figure 8: Output Attenuation vs. Vpin 3
Figure 9: Total Power Dissipation & Efficiency
vs. Output Power
5/8
TDA7262
Figure 11: Total Power Dissipation & Efficiency
vs. Output Power
Figure 12
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BUILD-IN PROTECTION SYSTEMS
Thermal shut-down
The presence of a thermal limiting circuit offers
the following advantages:
1) an overload on the output (even if it is permanent), or an excessive ambient temperature
can be easily withstood.
2) the heatsink can have a smaller factor of
safety compared with that of a conventional
circuit. There is no device damage in the case
of excessive junction temperature; all that
happens is that PO ( and therefore Ptot) and
IO are reduced. The maximum allowable
power dissipation depends upon the size of
the external heatsink (i.e. its thermal resistance); Figure 12 shows this dissipable power
as a function of ambient temperature for different thermal resistance.
6/8
Short circuit (AC Conditions)
The TDA7262 can withstand accidental short circuits across the speaker made by a wrong connection during normal play operation.
MOUNTING INSTRCTIONS
The power dissipated in the circuit must be removed by adding an external heatsink.
Thanks to the MULTIWATT package attaching
the heatsink is very simple, a screw or a compression spring (clip) being sufficient. between
the heatsink and the package it is better to insert
a layer of silicon grease, to optimize the thermal
contact; no electrical isolation is needed between
the two surfaces.
TDA7262
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
D
OUTLINE AND
MECHANICAL DATA
0.063
1
0.039
E
0.49
0.55
0.019
0.022
F
0.88
0.95
0.035
0.037
G
1.45
1.7
1.95
0.057
0.067
0.077
G1
16.75
17
17.25
0.659
0.669
0.679
H1
19.6
0.772
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o Multiwatt11
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H2
20.2
0.795
L
21.9
22.2
22.5
0.862
0.874
0.886
L1
21.7
22.1
22.5
0.854
0.87
0.886
L2
17.4
18.1
0.685
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
0.713
L7
2.65
2.9
0.104
M
4.25
4.55
4.85
0.167
0.179
0.191
0.114
M1
4.73
5.08
5.43
0.186
0.200
0.214
S
1.9
2.6
0.075
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
0.102
7/8
TDA7262
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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© 2003 STMicroelectronics - All rights reserved
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