400

Audio ICs

BA5415A / BA5416

FOperation notes

(5)

Standby switch

The IC has a built-in standby switch (pin 6), so the IC can

be powered on and off by a switch with low current capac-

the standby switch will not adversely influence circuit

characteristics as with conventional methods. This also

increases design freedom. At normal temperatures, the

recommend that you use it at 3.5V or higher to allow for

low temperatures.

A small “pop” noise may be generated when the power

is switched off using the external switch. If this is the

µF in paral-

lel with the switch.

(6)

Filter pin

Pin 7 is for connection of a ripple filter. The ripple rejection

can be increased somewhat by increasing the capaci-

tance, but this also affects the starting time, so we recom-

mend a value in the range 100

µF to 220µF. The standard

starting time is 0.8sec.

(7)

Applied voltage

As long as the output power transistor is operated within

the ASO (safe operating range Fig. 9), the IC can be op-

24.0V). During normal operation, operate the IC within its

recommended operating voltage range; exceeding this

range will result in destruction of the IC. When the stand-

24.0V, but when the standby switch is on, set the power

supply regulation characteristics (including the capaci-

tance of the power supply capacitor connected between

GND will be reversed and the IC will be destroyed

instantly.

(8)

Thermal shutdown

If the load is shorted or there is insufficient heat dissipa-

tion, the thermal shutdown circuit will operate limit the

output and prevent damage to the IC. This occurs when

the temperature of the heatsink plate exceeds a temper-

ature of about 175

_C.

(9)

Other

Provided the recommended circuit constants are used,

the application circuit will function correctly. However, we

recommend that you confirm the characteristics of the

circuit in actual use.

If you change the circuit constants, check both the static

and transient characteristics of the circuit, and allow suffi-

cient margin to accommodate variations in both ICs and

external components.

_C, measurement circuit: Fig. 1)