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TDA7564 데이터시트(PDF) 8 Page - STMicroelectronics

부품명 TDA7564
상세설명  MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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Figure 14. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 4
Ω)
Figure 15. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 2
Ω)
012345
Po (W)
0
5
10
15
20
25
30
35
40
45
Ptot (W)
Vs = 14 V
RL = 4 x 4 Ohm
GAUSSIAN NOISE
STD MODE
HI-EFF MODE
CLIP
START
012345
6789
Po (W)
0
10
20
30
40
50
60
70
80
90
Ptot (W)
Vs = 14 V
RL = 4 x 2 Ohm
GAUSSIAN NOISE
STD MODE
HI-EFF MODE
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. 16) 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 16. Turn - On diagnostic: working principle
CH-
CH+
Isource
Vs~5V
Isink
t (ms)
I (mA)
Isink
Isource
~100mS
Measure time


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