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TA8266H Datasheet(PDF) 6 Page - Toshiba Semiconductor |
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TA8266H Datasheet(HTML) 6 Page - Toshiba Semiconductor |
6 / 14 page TA8266H 2002-02-13 6 6. 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 W 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 1) ¯ 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. Note 1: It is appeared by biased input DC voltage (for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.) Current into a speaker Speaker impedance Less than 4 W Figure 9 About 1 W 4 W Operating point of protector |
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