CONSUMPTION
AC SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
=28V, RL = 8Ω, THD=10%
S
TDA7263
DESCRIPTION
The TDA7263 is class AB dual audio power amplifier assembled in the new Clipwatt package,
specially designed for high quality sound application as HI-FI music centers and stereo TV sets.
TEST AND APPLICATION CIRCUIT
Clipwatt11
ORDERING NUMBER:
TDA7263
September 2003
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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TDA7263
ABSOLUTE MAXIMUM RATINGS
SymbolParameterValueUnit
Supply Voltage without Load35V
Output Peak Current (repetitive f >20Hz)2A
Total Power Dissipation (T
= 70°C)25W
case
Operating Temperature Range0 to 70°C
Storage & Junction Temperature-40 to 150°C
T
V
I
O
P
T
op
stg,Tj
S
tot
PIN CONNECTION
BLOCK DIAGRAM
(Top view)
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THERMAL DATA
SymbolParameterValueUnit
R
th j-case
Thermal resistance junction to case Max3°C/W
TDA7263
ELECTRICAL CHARACTERISTICS
Gv = 30dB; f = 1KHz; T
= 25°C unless otherwise specified.)
amb
(Refer to the stereo test and application circuit, V
= 28V; R
S
SymbolParameterTest ConditionMin.Typ.Max.Unit
V
S
V
O
I
q
P
O
dTotal Harmonic DistortionP
Supply Voltage1030V
Quiescent Output Voltage13.5V
Total Quiescent Current 7095mA
Output Power (RMS)d = 10% Tamb = 85°C
d = 1%
= 1W, f = 1kHz
O
f = 10 0Hz to 1 0KHz ; P
O
= 0.1 to 8W
1012
9.5
0.020.2
0.5
CTCross TalkRS = 10KΩ; f = 1KHz70dB
= 10KΩ; f = 10KHz60dB
R
S
R
f
L
f
H
e
N
Input Resistance100200KΩ
I
Low Frequency Roll-off (-3dB)40Hz
High Frequency Roll-off (-3dB)80KHz
Total Input Noise VoltageA Curve; RS = 10KΩ1.5mV
f = 22Hz to 22KHz; RS = 10KΩ310µV
SVRSupply Voltage Rejection
= 10KΩ; f = 100Hz; Vr = 0.5V4560dB
R
S
(each channel)
T
j
Thermal Shutdown Junction
145°C
Temperature
MUTE FUNCTION
VT
VT
ATT
I
qMUTE
MUTE
PLAY
Mute Threshold11.6V
Play Threshold4.5V
Mute Attenuation70100dB
AM
Quiescent Current @ Mute710mA
= 8
Ω;
L
W
W
%
TYPICAL CHARACTERISTICS
otherwise specified)
Figure 1:
Output Power vs. Supply Voltage
(referred to the typical Application Circuit, V
Figure 2:
Distortion vs. Output Power
= 28V, RL = 8Ω, unless
S
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TDA7263
Figure 3:
Figure 5:
Quiescent Current vs. Supply Voltage
Crosstalk vs. Frequency
Figure 4:
Figure 6:
Supply Voltage Rejection vs.
Frequency
Output Attenuation & Quiescent
Current vs. V
pin3
Figure 7:
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Total Power Dissipation vs. Output
Power
Figure 8:
Maximum allowable Power dissipation
vs. Ambient Temperature
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TDA7263
APPLICATION SUGGES TION
The recommended values of the components ar e those shown on the typical application circuit. Different
values can be used; the following table can help the designer.
Component
R1 and R31.5KΩClose loop gain setting (*)Increase of gainDecrease of gain
R2 and R447ΩClose loop gain setting (*)Decrease of gainIncrease of gain
R5 and R64.7ΩFrequency stabilityDanger of oscillations
C1 and C2100nFInput DC decouplingHigher SVRHigher low frequency cutoff
C347µF- Ripple Rejection
C4100nFSupply Voltage BypassDanger of oscillations
C51000µFSupply Voltage Bypass
C6 and C747µFFeedback input DC
C8 and C90.1µFFrequency stabilityDanger of oscillations
C10 and C111000µFOutput DC decouplingHigher low-frequency cut-off
(*) Closed loop gain must be higher than 26dB
Figure 9:
Recomm.
Value
- Mute time constant
decoupling
P.C. Board and Component Layout (1:1 scale)
PurposeLarger ThanSmaller Than
Increase of the Switch-on
time
Increase of the Switch-on
time
- Degradation of SVR
- Worse turn-off pop by mut ing
Danger of Switch-on time
Note:
Use either C1, C2 (Polyester) or C1(*), C2(*) (Electrolytic) but not both.
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TDA7263
BUILT-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 perma-
nent), 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; if for any
reason the junction temperature increases up
to 145°C. the thermal shutdown simply re-
duces the output power and therefore the
power dissipation.
The maximum allowable power dissipation depends upon the thermal resistance junction-ambient. Figure 8 shows the dissipable power as a
function of ambient temperature for different
heatsink thermal resistance.
SHORT CIRCUIT (AC CONDITIONS)
The TDA7263 can withstand accidental short cir-
cuits across the speaker made by a wrong connection during normal play operation.
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