TDA7563A STMicroelectronics, TDA7563A Datasheet - Page 15

• Manufacturer Part Number: TDA7563A
• Description: IC AMP QUAD MULTIFUNC FLEXIWATT2
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7563A

• Output Type: 4-Channel (Quad)
• Max Output Power X Channels @ Load: 75W x 4 @ 2 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: I²C, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: 27-Flexiwatt (bent and staggered leads)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7563A
3.2
Concerning SHORT ACROSS THE SPEAKER / OPEN SPEAKER, the threshold varies
from 26 dB to 12 dB gain setting, since different loads are expected (either normal speaker's
impedance or high impedance). The values in case of 26 dB gain are as follows:
Figure 23. Thresholds for short across the speaker/open speaker
If the Line-Driver mode (Gv= 12 dB and Line Driver Mode diagnostic = 1) is selected, the
same thresholds will change as follows:
Figure 24. Thresholds for line-drivers
Permanent diagnostics
The following additional features are provided:
The TDA7563A has 2 operating statuses:
1.
2.
Detectable conventional faults are:
–
–
–
–
RESTART mode. The diagnostic is not enabled. Each audio channel operates
independently from each other. 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
Restart takes place when the overload is removed.
DIAGNOSTIC mode. It is enabled via I
(such to cause the intervention of the short-circuit protection) occurs to the speakers
outputs. Once activated, the diagnostics procedure develops as follows
–
–
–
Short to GND
Short to Vs
Short across the speaker
Output offset detection
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 performed and the channel returns back active.
Instead, if an overload is detected during the check after 1 ms, then a diagnostic
cycle having a duration 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
0V
0Ω
S.C. across Load
S.C. across Load
0.5Ω
1.5Ω
x
x
1.5Ω
4.5Ω
Normal Operation
Normal Operation
2
C bus and self activates if an output overload
70Ω
200Ω
x
x
Diagnostics functional description
400Ω
130Ω
Open Load
Open Load
D01AU1254
D01AU1252
Infinite
infinite
(Figure
(Figure
26):
25).
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