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BA5415 Fiches technique(PDF) 6 Page - Rohm

No de pièce BA5415
Description  High-output dual power amplifier
Download  10 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BA5415 Fiches technique(HTML) 6 Page - Rohm

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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-
ity. The on voltage V1 can be in the range 3V to VCC, so
the standby switch will not adversely influence circuit
characteristics as with conventional methods. This also
increases design freedom. At normal temperatures, the
switch operates at a voltage of V1 = 3V or higher, but we
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
case, connect a capacitor of about C3 = 0.022
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-
erated to its absolute maximum ratings (VCCMAX. =
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-
by switch is off, the IC is guaranteed up to VCCMax. =
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
VCC and GND) so that VCC is 18.0V or less (15.0V or less
for the BA5416). If the IC is inserted backwards, VCC and
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.
(10) Standard values for the DC voltages on each pin (VCC = 12V, Ta = 25
_C, measurement circuit: Fig. 1)


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