TDA7263L Datasheet, PDF (6/10 Pages) Texas Instruments – 6 + 6W STEREO AMPLIFIER WITH MUTING

TDA7263L
4 APPLICATION SUGGESTION
The recommended values of the components are those shown on the typical application circuit. Different
values can be used; the following table can help the designer.
Component
Recomm.
Value
Purpose
Larger Than
Smaller Than
R1 and R3
1.5KΩ Close loop gain setting (*) Increase of gain
Decrease of gain
R2 and R4
47Ω Close loop gain setting (*) Decrease of gain
Increase of gain
R5 and R6
4.7Ω Frequency stability
Danger of oscillations
C1 and C2
100nF Input DC decoupling
Higher SVR
Higher low frequency cutoff
C3
47µF - Ripple Rejection
Increase of the Switch-on - Degradation of SVR
- Mute time constant
time
- Worse turn-off pop by muting
C4
100nF Supply Voltage Bypass
Danger of oscillations
C5
1000µF Supply Voltage Bypass
C6 and C7
47µF
Feedback input DC
decoupling
Increase of the Switch-on Danger of Switch-on time
time
C8 and C9
0.1µF Frequency stability
C10 and C11 1000µF Output DC decoupling
(*) Closed loop gain must be higher than 26dB
Danger of oscillations
Higher low-frequency cut-off
5 BUILT-IN PROTECTION SYSTEMS
5.1 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; if for any reason the junction temperature
increases up to 145°C. the thermal shutdown simply reduces the output power and therefore the power
dissipation.
The maximum allowable power dissipation depends upon the thermal resistance junction-ambient. Figure
15 shows the dissipable power as a function of ambient temperature for different heatsink thermal resis-
tance.
5.2 Short Circuit (AC Conditions)
The TDA7263L can withstand accidental short circuits across the speaker made by a wrong connection
during normal play operation.
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