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參數(shù)資料
| 型號(hào)： | TB2946HQ |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 26 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 484K |
| 代理商： | TB2946HQ |
TB2946HQ
2009-01-29
6
4. Layer Short Detection
The TB2946HQ may be properly connected to a load such as a 4-
Ω speaker, but one of the speaker lines may
be shorted to ground through a low-impedance path. The TB2946HQ can detect such a condition.
Figure 6 Layer Short
As is the case with output DC offset detection, pin 25 is also activated when there is a short on one of the
speaker lines as shown above. The detection impedance is 3.3
Ω (typ.).
This feature allows detection of a short-circuit through a low-impedance path other than the speaker
impedance. It helps to avoid speaker damage in case of anomalous system conditions and improve system
reliability.
Detection impedance vs junction te mperature
0
2
4
6
8
10
12
-50
0
50
100
150
200
Tj (℃)
D
e
tec
tio
ni
m
pe
da
n
ce
(
)
Te st co nditions
Vcc = 13.2 V
In tern al resistor
= 200
5 V-10 k
Pull-u p
Figure 7 Typical Detection Impedance vs Junction Temperature (Intended as a Guide)
Note 3: The detection impedance varies with temperature, as shown above. Experiment with actual hardware.
VCC
IC
GND
out
SP
= 4 Ω
The negative (
) speaker connection is shorted to ground
through a low-impedance path due to some irregularities.
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| TB2946HQ(O) | 功能描述:音頻放大器 49W x 4-CH Class-AB car power amplifer RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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