TA8221AHQ Toshiba, TA8221AHQ Datasheet - Page 5

• Manufacturer Part Number: TA8221AHQ
• Manufacturer: Toshiba

Specifications of TA8221AHQ

• No. Of Channels: 2
• Package: HZIP 17-P-2.00
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: 26W x 2
• Rl=4 Ohm: 19W x 2
• Rl=8 Ohm: -
• Features/built-in Functions: 2 BTL channels, standby switch
• Operating Voltage (v): 9 to 18

5. Muting function
6. Rapid ripple discharging circuit at the time of V
(Precaution 1)
Through setting pin(1) (mute terminal) at about 1V or less, muting
becomes possible.
The interval circuit of IC is shown in Fig.5.
When pin(1) is set to low, Q1 and Q2 are turned to on, the charge
of the ripple condenser is discharged and the bias is cut. The mute
amount of 60dB or over can be obtained.
Since this muting function rapidly discharge the charge of the ripple
filter capacitor of pin(8), the pop noise is generated by the DC
fluctuation of the bias section.
Therefore, this muting function is not appropriate to the audio muting but it
is effective in muting at V
This circuit is effective in such a mode where the V
simultaneously ; for instance, for a pop noise produced when the power is turned on / off repeatedly by operating
the ignition key.
If V
CC
(1) The power stage bias circuit is cut, and
(2) Pin(8) : Ripple capacitor is rapidly discharged by turning Q3 on and then Q1 and Q2 on.
When the stand−by terminal was put to the low level after the ripple rapid
discharging circuit was operated (V
off, a pop noise may be generated. Therefore, V
terminal low shall be set at 8V or above so that (1) the stand−by terminal is
put at the low level and (2) the ripple rapid discharging circuit is turned on
when V
An example of application is shown in (Fig.7).
is off, V
CC
CC
is turned off (in order of (1) and (2)).
≒7V is detected internally on IC and
CC
→on.
CC
≒7V) at the time when V
CC
CC
CC
off
and the stand−by terminals become high / low
which makes the stand−by
5
CC
was turned
TA8221AHQ / ALQ
2004-09-28