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TB2959HQ Datasheet(PDF) 10 Page - Toshiba Semiconductor

Part No. TB2959HQ
Description  Maximum Power 47W BTL 4-ch Audio Power IC
Download  24 Pages
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Maker  TOSHIBA [Toshiba Semiconductor]
Homepage  http://www.semicon.toshiba.co.jp/eng
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TB2959HQ Datasheet(HTML) 10 Page - Toshiba Semiconductor

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TB2959HQ
2011-11-08
10
11. Protection Functions
This product has internal protection circuits such as thermal shut down, over-voltage, out to VCC, out to
GND, and out to out short circuit protections.
(1)
Thermal shut down
It operates when junction temperature exceeds 150°C (typ.).
When it operates, it is protected in the following order.
1.
An Attenuation of an output starts first and the amount of attenuation also increases according
to a temperature rising,
2.
All outputs become in a mute state, when temperature continues rising in spite of output
attenuation.
3.
Shutdown function starts, when a temperature rise continues though all outputs are in a mute
state.
In any case if temperature falls, it will return automatically.
(2)
Over-voltage
It operates when voltage exceeding operating range is supplied to VCC pin. If voltage falls, it will
return automatically. When it operates, output bias is turned off and an output is intercepted.
(3)
Short to VCC, Short to GND, Output to output short
It operates when each pin is in irregular connection. If irregular connection is canceled, it will return
automatically.
Short circuit protection can operate for each channel.
When it operates, output bias of corresponding output is turned off and an output is intercepted.
Example) If channel 1 output shorts, channel 1 is protected but other channels 2 to 4 are available.
(4)
Prevention of speaker damage (in case of a layer short-circuit of the speaker)
When the DC resistance between the OUT
 and OUT pins falls below 1 , the output current exceeds
4 A. At this time, the protection circuit is activated to limit the current draw into the speaker.
This feature prevents the speaker from being damaged, as follows:
< Speaker damaging scenario >
A DC current of over 4 V is applied to the speaker due to an external circuit failure (Note 6).
(Abnormal DC output offset)

The speaker impedance becomes 1
 or less due to a layer short.
A current of over 4 A flows into the speaker, damaging the speaker.


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