ta8264ah TOSHIBA Semiconductor CORPORATION, ta8264ah Datasheet - Page 6

• Manufacturer Part Number: ta8264ah
• Description: Max Power 41 W Btl ? 4 Ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

6. Prevention of speaker burning accident
current over 4 A flows, this IC makes a protection circuit operate and suppresses the current into a speaker.
circuit failure.(Note 1)
Note 1: It is appeared by biased input DC voltage
When the direct current resistance between OUT + and OUT - terminal becomes 1 W or less and output
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
The speaker impedance becomes 1 W 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.
(for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
Less than 4 W
Current into a speaker
¯
¯
Figure 9
About 1 W
6
(In Case of Rare Short Circuit of Speaker)
Operating point of protector
4 W
Speaker impedance
TA8264AH
2002-02-13