參數(shù)資料
型號: TDA7575B
廠商: STMICROELECTRONICS
元件分類: 音頻/視頻放大
英文描述: 50 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM27
封裝: ROHS COMPLIANT, FLEXIWATT-27
文件頁數(shù): 17/32頁
文件大小: 487K
代理商: TDA7575B
Diagnostics functional description
TDA7575B
Doc ID 14103 Rev 2
Figure 31.
SVR and output pin behavior - case 2: with turn-on diagnostic
The information related to the outputs status is read and memorized at the end of the
current pulse top. The acquisition time is 100 ms (typ.). No audible noise is generated in the
process. As for short to GND / Vs the fault-detection thresholds remain unchanged from 26
dB to 12 dB gain setting. They are as follows:
Figure 32.
Short circuit detection thresholds
Concerning short across the speaker / open speaker, the threshold varies from 26 dB to 12
dB gain setting, since different loads are expected (either normal speaker's impedance or
high impedance). The values in case of 26 dB gain are as follows:
Figure 33.
Load detection thresholds - high gain setting
If the line-driver mode (Gv= 12 dB and line driver mode diagnostic = 1) is selected, the same
thresholds will change as follows:
Figure 34.
Load detection thresholds - high gain setting
Bias (power amp turn-on)
permitted time
Turn-on diagnostic
acquisition time (100mS Typ)
t
Read Data
Permanent diagnostic
acquisition time (100mS Typ)
Permanent Diagnostics data (output)
permitted time
Diagnostic Enable
(Turn-on)
Turn-on Diagnostics data (output)
permitted time
I2CB DATA
Vsvr
Out
Diagnostic Enable
(Permanent)
FAULT
event
D02AU1341
S.C. to GND
x
S.C. to Vs
0V
1.8V
VS-1.5V
VS
x
Normal Operation
1.2V
VS-0.9V
S.C. across Load
x
Open Load
0V
1.5
Ω
70
Ω
Infinite
x
Normal Operation
0.5
Ω
130
Ω
D01AU1254
D01AU1252
S.C. across Load
x
Open Load
0
Ω
4.5
Ω
200
Ω
infinite
x
Normal Operation
1.5
Ω
400
Ω
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