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TA8271HQ View Datasheet(PDF) - Toshiba

Part NameTA8271HQ Toshiba
Toshiba Toshiba
DescriptionMax Power 41 W BTL x 4 ch Audio Power IC
TA8271HQ Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
TA8271HQ
4. AUX Input (pin 16)
The pin 16 is for input terminal of AUX
amplifier.
The total gain is 0dB by using of AUX amplifier.
Therefore, the µ-COM can directly drive the
AUX amplifier.
BEEP sound or voice synthesizer signal can be
input to pin 16 directly.
When AUX function is not used, this pin must be
connected to PRE-GND (pin 13) via a capacitor.
20dB AMP.
IN
µ-COM
AUX-IN
16
AUX AMP
20dB
OUT (+)
OUT ()
Figure 6 AUX Input
5. Prevention of speaker burning accident (In Case of Rare Short Circuit of Speaker)
When the direct current resistance between OUT + and OUT terminal becomes 1 or less and output
current over 4 A flows, this IC makes a protection circuit operate and suppresses the current into a speaker.
This system makes the burning accident of the speaker prevent as below mechanism.
<The guess mechanism of a burning accident of the speaker>
Abnormal output offset voltage (voltage between OUT + and OUT ) over 4 V is made by the external
circuit failure.(Note 4)
The speaker impedance becomes 1 or less as it is in a rare short circuit condition.
The current more than 4 A flows into the speaker and the speaker is burned.
Current into a speaker
Less than 4
Operating point of protector
About 1 4
Figure 9
Speaker impedance
Note 4: It is appeared by biased input DC voltage
(for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
5
2004-05-10
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