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参数资料
| 型号： | TDA7575BPDTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | ROHS COMPLIANT, SOP-36 |
| 文件页数： | 16/32页 |
| 文件大小： | 487K |
| 代理商： | TDA7575BPDTR |
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TDA7575B
Diagnostics functional description
Doc ID 14103 Rev 2
7
Diagnostics functional description
7.1
Turn-on diagnostic
It is activated at the turn-on (stand-by out) under I2C bus request. Detectable output faults are:
–
Short to GND
–Short TO Vs
–
Short across the speaker
–
Open speaker
To verify if any of the above misconnections are in place, a subsonic (inaudible) current
pulse (Figure 29) is internally generated, sent through the speaker(s) and sunk back. The
Turn On diagnostic status is internally stored until a successive diagnostic pulse is
requested (after a I2C reading).
If the "stand-by out" and "diag. enable" commands are both given through a single
programming step, the pulse takes place first (power stage still in stand-by mode, low,
outputs = high impedance).
Afterwards, when the Amplifier is biased, the PERMANENT diagnostic takes place. The
previous Turn On state is kept until a short appears at the outputs.
Figure 29.
Turn-on diagnostic: working principle
out) with and without Turn-on diagnostic.
Figure 30.
SVR and output behavior - case 1: without turn-on diagnostic
CH-
CH+
Isource
Vs~5V
Isink
t (ms)
I (mA)
Isink
Isource
~100mS
Measure time
Bias (power amp turn-on)
t
Diagnostic Enable
(Permanent)
Permanent diagnostic
acquisition time (100mS Typ)
Permanent Diagnostics data (output)
permitted time
I2CB DATA
Vsvr
Out
FAULT
event
Read Data
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| TDA7575PD | 功能描述:音频放大器 INFOTAINMENT S PWR 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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