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(yè)數(shù)： 19/22頁(yè)
文件大?。?/td> 377K
代理商： TDA7476013TR
TDA7476
6/19
s
Isink and Isource are depending on the external resistor Rcs. The minimum allowed value for Rcs is
1.65KOhm. The relationship among Isink, Isource and Rcs is the following:
Isink = (3.3/Rcs) 11
Isource = 1.5 Isink
s
On bridge (or bridge equivalent) devices if there is no short circuit to GND or to Vs, Isource goes into
saturation mode (for Vout > 3V), and in the load flows Isink. As the turn-on diagnostic thresholds are
fixed, it is possible to calculate the ranges of loudspeaker resistance in which short circuit (S.C.), normal
operation and open load are detected as following:
where Lsc, Lnop, Lop as specified in the ELCTRICAL CHARACTERISTICS.
For example, here below are two cases, with Rcs = 3.3KOhm and Rcs = 1.8KOhm..
The exact values of the above mentioned resistive ranges may vary a little, depending on the power amplifier
used.
Turn-on diagnostic - CH1, CH2, CH3, CH4, CH5 - Short to GND and Vs.
To detect if there is short circuit to GND or Vs, the subsonic current pulse is exploited. The information related
to the status of the outputs are measured and memorized at the top of the current pulse (tm in fig.1). If no faults
are present, the pins connected to the audio outputs (CH1,..CH5) will reach about 3V.If one or more outputs are
shorted to GND, these voltages become lower than 3V.If one or more outputs are shorted to Vs, the output volt-
age increases over 3V.The fault status can be know by sensing the output voltages. The reason way voltage
threshold has been preferred instead of a current threshold to declare short circuit resistor ranges is two fold:
S.C. across Load
x
Open Load
0
R2
R3
infinite
x
Normal Load
R1
R4
D01AU1256
R1
L
sc,max
I
k
sin
-------------------
L
sc ,max
36.3
------------------- R
cs
==
R2
L
no p,min
I
k
sin
----------------------
L
nop ,min
36.3
---------------------- R
cs
==
R3
L
no p,max
I
k
sin
-----------------------
L
no p,max
36.3
----------------------- R
cs
==
R3
L
op ,max
I
k
sin
--------------------
L
op min
,
36.3
-------------------- R
cs
==
S.C. across Load
x
Open Load
0
1.1
11
infinite
x
Normal Operation
0.24
27
D96AU500A
S.C. across Load
x
Open Load
0
2
20
infinite
x
Normal Operation
0.45
50
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