STA540 STMicroelectronics, STA540 Datasheet - Page 19

• Manufacturer Part Number: STA540
• Description: IC AMP AUD DUAL/QUAD MULTIWATT15
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of STA540

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Max Output Power X Channels @ Load: 38W x 2 @ 4 Ohm; 16W x 4 @ 4 Ohm
• Voltage - Supply: 8 V ~ 22 V
• Features: Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: Multiwatt-15 (Vertical, Bent and Staggered Leads)
• Amplifier Class: AB
• No. Of Channels: 4
• Output Power: 24W
• Supply Voltage Range: 8V To 22V
• Thd + N: 0.02% @ 4W, 4ohm, VS=14.4V
• Load Impedance: 8ohm
• Operating Temperature Range: -40°C To +150°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8880-5

STA540
6.8
Handling the diagnostic information
As different diagnostic information (clipping detection, output fault, approaching thermal
shutdown) becomes available at pin 10 so the behavior of the signal at this pin changes.
In order to discriminate the event, signal DIAGNOSTICD, pin 10, must be interpreted
correctly.
corresponding output on pin 10.
This events could be diagnosed based on the timing of the output signal on pin 10. For
example, the clip-detector signalling under fault conditions could produce a low level for a
short time. On the other hand, an output short circuit would probably produce a low level for
a much longer time. With these assumptions, an interface circuit based on the one shown in
Figure 28
Figure 27. Waveforms
Figure 28. Interface circuit diagram
WAVEFORM
WAVEFORM
ST-BY PIN
VOLTAGE
Figure 27
OUTPUT
could differentiate the information and flag the appropriate circuits.
Vpin 10
Vs
shows a combination of events on the output waveform and the
D05AU1604mod
CLIPPING
SHORT TO GND
OR TO Vs
PROXIMITY
Practical information
THERMAL
t
t
t
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