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TDA7385 データシート(PDF) 9 Page - STMicroelectronics

部品番号 TDA7385
部品情報  4 x 30W QUAD BRIDGE CAR RADIO AMPLIFIER
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7385 データシート(HTML) 9 Page - STMicroelectronics

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background image
t
t
t
MUTE PIN
VOLTAGE
Vs
OUTPUT
WAVEFORM
Vpin 25
WAVEFORM
SHORT TO GND
OR TO Vs
D95AU304
CLIPPING
THERMAL
PROXIMITY
ST-BY PIN
VOLTAGE
t
Figure 14: Diagnostics Waveforms.
reached.
As various kind of diagnostics information is avail-
able at pin 25 (CLIPPING, SHORTS AND OVER-
HEATING), it may be necessary to operate some
distinctions on order to treat each event sepa-
rately. This could be achieved by taking into ac-
count the intrinsically different timing of the diag-
nostics output under each circumstance.
In fact, clipping will produce pulses normally
much shorter than those present under faulty con-
ditions. An example of circuit able to distinguish
between the two occurrences is shown by fig. 15.
STABILITY AND LAYOUT CONSIDERATIONS
If properly layouted and hooked to standard car-
radio speakers, the TDA7385 will be intrinsically
stable with no need of external compensations
CLIP DET. (TO GAIN
COMPRESSOR/
TONE CONTROL)
T1
25
D95AU305
TDA7385
+
-
VREF
VREF1
T2
FAULT, THERMAL SHUTDOWN
(TO POWER SUPPLY
SECTION,
µP VOLTAGE
REGULATOR, FLASHING SYSTEM)
+
-
VREF2
T1 << T2
VREF
≥ VREF1 >> VREF2
Figure 15.
TDA7385
9/12


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