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E-TDA7562

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TDA7562
Figure 8. Distortion vs. Frequency (2)
Figure 9. Crosstalk vs. Frequency
Figure 10. Supply Voltage Rejection vs. Freq.
Figure 11. Power Dissipation & Efficiency vs.
Output Power (4, STD, SINE)
Figure 12. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 4)
Figure 13. Power Dissipation vs. Average
Ouput Power (Audio Program
Simulation, 2)
10 100 1000 10000
f (Hz)
20
30
40
50
60
70
80
90
CROSSTALK (dB)
RL = 4 Ohm
Po = 4 W
R
g
= 600 Ohm
10 100 1000 10000
f (Hz)
20
30
40
50
60
70
80
90
SVR (dB)
R
g
= 600 Ohm
Vripple= 1 Vpk
0 2 4 6 8 101214161820222426
Po (W)
0
10
20
30
40
50
60
70
80
90
Ptot (W)
0
10
20
30
40
50
60
70
80
90
n (%)
Vs = 14.4 V
RL = 4 x 4 Ohm
f = 1 KHz SINE
n
Ptot
01
2
345
Po (W)
5
10
15
20
25
30
35
40
45
Ptot (W)
Vs = 14 V
RL = 4 x 4 Ohm
GAUSSIAN NOISE
CLIP
START
012345678
Po (W)
0
10
20
30
40
50
60
70
80
90
Ptot (W)
Vs = 14 V
RL = 4 x 2 Ohm
GAUSSIAN NOISE
CLIP
START
TDA7562
8/17
DIAGNOSTICS FUNCTIONAL DESCRIPTION:
Detectable conventional faults are:
–SHORT TO GND
–SHORT TO Vs
– SHORT ACROSS THE SPEAKER
The following additional features are provided:
– OUTPUT OFFSET DETECTION
The TDA7562 has 2 operating statuses:
1)) RESTART mode. The diagnostic is not enabled. Each audio channel operates independently from each oth-
er. If any of the a.m. faults occurs, only the channel(s) interested is shut down. A check of the output status
is made every 1 ms (fig. 14). Restart takes place when the overload is removed.
2)) DIAGNOSTIC mode. It is enabled via I2C bus and self activates if an output overload (such to cause the
intervention of the short-circuit protection) occurs to the speakers outputs . Once activated, the diagnostics
procedure develops as follows (fig. 15):
– To avoid momentary re-circulation spikes from giving erroneous diagnostics, a check of the output
status is made after 1ms: if normal situation (no overloads) is detected, the diagnostic is not per-
formed and the channel returns back active.
– Instead, if an overload is detected during the check after 1 ms, then a diagnostic cycle having a du-
ration of about 100 ms is started.
– After a diagnostic cycle, the audio channel interested by the fault is switched to RESTART mode. The
relevant data are stored inside the device and can be read by the microprocessor. When one cycle
has terminated, the next one is activated by an I2C reading. This is to ensure continuous diagnostics
throughout the car-radio operating time.
– To check the status of the device a sampling system is needed. The timing is chosen at microproces-
sor level (over half a second is recommended).
Figure 14. Restart timing without Diagnostic Enable (Each 1mS time, a sampling of the fault is done)
Figure 15. Restart timing with Diagnostic Enable
t
1-2mS
1mS 1mS 1mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed
Out
t
Overcurrent and short
(i.e. short circuit to GND)
Short circuit removed
1mS 100mS 1mS1mS
9/17
TDA7562
As for SHORT TO GND / Vs the fault-detection thresholds remain unchanged from 30 dB to 16 dB gain setting.
They are as follows:
Concerning SHORT ACROSS THE SPEAKER , the threshold varies from 30 dB to 16 dB gain setting, since
different loads are expected (either normal speaker's impedance or high impedance). The values in case of 30
dB gain are as follows:
If the Line-Driver mode (Gv= 16 dB and Line Driver Mode diagnostic = 1) is selected, the same thresholds will
change as follows:
OUTPUT DC OFFSET DETECTION
Any DC output offset exceeding ± 2V are signalled out. This inconvenient might occur as a consequence of ini-
tially defective or aged and worn-out input capacitors feeding a DC component to the inputs, so putting the
speakers at risk of overheating.
This diagnostic has to be performed with low-level output AC signal (or Vin = 0).
The test is run with selectable time duration by microprocessor (from a "start" to a "stop" command):
– START = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1
– STOP = Actual reading operation
Excess offset is signalled out if persistent throughout the assigned testing time. This feature is disabled if any
overloads leading to activation of the short-circuit protection occurs in the process.
MULTIPLE FAULTS
When more misconnections are simultaneously in place at the audio outputs, it is guaranteed that at least one
of them is initially read out. The others are notified after successive cycles of I
2
C reading and faults removal,
provided that the diagnostic is enabled.
The table below shows all the couples of double-fault possible. It should be taken into account that a short circuit
D01AU1253
S.C. to GND x S.C. to Vs
0V 1.8V V
S
-1.8V V
S
xNormal Operation
1.2V V
S
-1.2V
S.C. across Load x
0V 1.5Ω Infinite
Normal Operation
0.5Ω
D01AU1254mod
D01AU1252mod
S.C. across Load x
0Ω 4.5Ω infinite
Normal Operation
1.5Ω
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E-TDA7562

Mfr. #:
Buy E-TDA7562
Manufacturer:
STMicroelectronics
Description:
IC AMP AUDIO PWR 60W 27FLEXIWATT
Lifecycle:
New from this manufacturer.
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