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参数资料
| 型号： | TB2936HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 26 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 18/20页 |
| 文件大小： | 470K |
| 代理商： | TB2936HQ |
TB2936HQ
2009-02-04
7
5. 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 Ω, 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 4).
(Abnormal DC output offset)
↓
The speaker impedance becomes 1
Ω or less due to a layer short.
↓
A current of over 4 A flows into the speaker, damaging the speaker.
Figure 8
Note 4: An abnormal DC offset voltage is incurred when the input bias to the power IC is lost due to a leakage
current from a coupling capacitor at the input or a short-circuit between the IN and adjacent lines.
Current into the speaker
Speaker Impedance
Less than 4 A
About 1
Ω
4
Ω
The short-circuit protection is activated
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| TB2939HQ(O) | 功能描述:音频放大器 45W x 4-CHANNEL car power amplifer RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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