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參數(shù)資料
| 型號： | TDA7476 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 19/19頁 |
| 文件大?。?/td> | 161K |
| 代理商： | TDA7476 |
9/19
TDA7476
The following table shows the result pointed out by TDA7476 when multiple misconnections are present:
(*) CH means CH+ or CH-
AUX1 - AUX2
s
Voltage across the sensing resistors
s
The minimum voltage of the AUX IN pin to sense the open load condition is 2V.
s
The minimum voltage of the AUX IN pin to detect the short circuit to GND, by sensing the drop on the
resistors is 4.5V. If this voltage falls below 2V, the AUX in is considered short circuited to GND. From
2V to 4.5V the sensing circuit can detect a short circuit in both ways (by sensing across the resistor or
through the voltage between the AUX IN pin and GND).
PERMANENT DIAGNOSTIC - THRESHOLDS
CH1, CH2, CH3, CH4, CH5
s
The circuit will recognize as a fault condition any situation where the following short circuit voltages last
more than 2 sec (typ).
s
Output voltage
AUX1 - AUX2
s
The voltage across the resistors Rsens1 or Rsens2 is sensed. The circuit will recognize as a fault
condition any situation where the following voltages last more than 2sec (typ) in the region "S.C.to GND"
or "open load".
ACTUAL FAULTS
POINTED OUT FAULT
S.C. CH+ to GND + OPEN LOAD
S.C. to GND
S.C. CH(*) to GND + S.C. ACROSS LOAD
S.C. to GND
S.C. CH- to GND + OPEN LOAD
OPEN LOAD
S.C. CH(*) to VS + OPEN LOAD
S.C. to VS
S.C. CH(*) to VS + S.C. ACROSS LOAD
S.C. to VS
S.C. CH+ to VS + S.C. CH- to GND
S.C. to VS
S.C. CH- to VS + S.C. CH+ to GND
S.C. to GND + S.C. to VS
S.C. to GND
x
Open Load
VS
0.5V
125mV
0V
x
Normal Operation
0.85V
85mV
D97AU572A
S.C. to GND
x
S.C. to Vs
0V
1.2V
VS-1.2
VS
x
Normal Operation
0.8V
VS-0.6V
D97AU573B
S.C. to GND
x
Open Load
VS
0.5V
125mV
0V
x
Normal Operation
0.85V
85mV
D97AU574A
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