TDA7263L

6/10

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.

(*) Closed loop gain must be higher than 26dB

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.

Component

Recomm.

Value

Purpose

Larger Than

Smaller Than

R1 and R3

1.5K

Ω

Close loop gain setting (*)

Increase of gain

Decrease of gain

R2 and R4

47

Ω

Close loop gain setting (*)

Decrease of gain

Increase of gain

R5 and R6

4.7

Ω

Frequency stability

Danger of oscillations

C1 and C2

100nF

Input DC decoupling

Higher SVR

Higher low frequency cutoff

C3

47

µF

- Ripple Rejection

- Mute time constant

Increase of the Switch-on

time

- Degradation of SVR

- Worse turn-off pop by muting

C4

100nF

Supply Voltage Bypass

Danger of oscillations

C5

1000

µF

Supply Voltage Bypass

C6 and C7

47

µF

Feedback input DC

decoupling

Increase of the Switch-on

time

Danger of Switch-on time

C8 and C9

0.1

µF

Frequency stability

Danger of oscillations

C10 and C11

1000

µF

Output DC decoupling

Higher low-frequency cut-off