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參數(shù)資料
| 型號： | TDA7561 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 38 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | FLEXIWATT-25 |
| 文件頁數(shù)： | 18/19頁 |
| 文件大?。?/td> | 235K |
| 代理商： | TDA7561 |
TDA7561
8/19
Figure 12. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 4
)
Figure 13. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 2
)
01
234
5
Po (W)
5
10
15
20
25
30
35
40
45
Ptot (W)
CLIP
START
Vs = 14.4 V
RL = 4x4 Ohm
GAUSSIAN NOISE
0123
45678
Po (W)
0
10
20
30
40
50
60
70
80
90
Ptot (W)
Vs = 14.4 V
RL = 4x2 Ohm
GAUSSIAN NOISE
CLIP
START
DIAGNOSTICS FUNCTIONAL DESCRIPTION:
a) TURN-ON DIAGNOSTIC.
It is activated at the turn-on (stand-by out) under I2Cbus 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 (fig. 14) is inter-
nally 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 14. Turn - On diagnostic: working principle
CH-
CH+
Isource
Vs~5V
Isink
t (ms)
I (mA)
Isink
Isource
~100ms
Measure time
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