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參數(shù)資料
| 型號(hào)： | TDA7476013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 21/22頁 |
| 文件大?。?/td> | 377K |
| 代理商： | TDA7476013TR |
TDA7476
8/19
Permanent diagnostic - AUX1, AUX2 - Short circuit to GND and open load
s
The detection mode of the auxiliary inputs is equal to what is in place during turn-on, but the fault must
be lasting without interruption for more than 2 seconds.The warning pin is pulled down only in case of
short to GND. This is to avoid that this pin remains permanently to 0 level if one or both AUX outputs of
the car radio are unused.
Timing
s
From the byte "ADD1" to the byte "ADD2" the mP must wait a period Twait1(see Software Specification)
that is depending on the timing capacitor CT according to the following table (Twait1> tm, max):
Note: any (positive) spread of the capacitor value must be added. The relation to be used to determine Twait1
from the value of CT according to the following:
Twait1 > tm, max = (130 CT/10
F)ms
s
After the byte "ADD2" the power amplifier can be switched-on. In some cases, the
P has to wait until
the current pulse is finished (Twait2). This time (ts in fig.1) is given by:
Twait2 > ts, max = (140 CT/10
F)ms
For bridge or bridge equivalent devices (figg.5,6), Ct = 10
F will be enough.
TURN-ON DIAGNOSTIC - THRESHOLDS
CH1, CH2, CH3, CH4, CH5
s
Output voltage during test. (The power amplifier must be in ST-BY mode).
s
Voltage across the load during test. (The power amplifier must be in ST-BY mode).
s
Note: some faults can mask others if they are present at the same moment on the same channel:
- If there is a short to GND and an open load on the same channel, the TDA7476 gives information only
about one of them, depending on the wire on which the short circuit is present.
- The short circuit to GND masks any short circuit across the load.
- The short circuit to Vs masks any short or open load.
CT (
F)
tm max (ms)
3.3
45
4.7
65
10
130
22
290
47
620
100
1300
D96AU502B
S.C. to GND
x
S.C. to Vs
0V
1.2V
VS-1.2
VS
x
Normal Operation
0.8V
VS-0.6V
S.C. across Load
x
Open Load
0V
22mV
220mV
VS
x
Normal Operation
5mV
550mV
D97AU631A
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