TDA7575B STMicroelectronics, TDA7575B Datasheet - Page 25

• Manufacturer Part Number: TDA7575B
• Description: IC AMP DUAL BRIDGE FLEXIWATT27
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7575B

• Output Type: 1-Channel (Mono) or 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 150W x 1 @ 1 Ohm; 75W x 2 @ 2 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: Differential Inputs, I²C, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: 27-Flexiwatt (bent and staggered leads)
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 1-Channel Mono/2-Channel Stereo
• Output Power (typ): 150x1@1Ohm/75x2@2OhmW
• Audio Amplifier Function: Speaker
• Input Offset Voltage: 45@14.4VmV
• Total Harmonic Distortion: 0.02@4Ohm@30W%
• Single Supply Voltage (typ): 9/12/15V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Power Dissipation: 86W
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 8V
• Single Supply Voltage (max): 18V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -55C to 150C
• Operating Temperature Classification: Military
• Mounting: Through Hole
• Pin Count: 27
• Package Type: FLEXIWATT(Vertical)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7575B
7.2
Permanent diagnostics
Detectable conventional faults are:
The following additional features are provided:
The TDA7575B has 2 operating statuses:
1.
2.
Figure 35. Restart timing without diagnostic enable (permanent)
Figure 36. Restart timing with diagnostic enable (permanent)
–
–
–
–
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 (fig. 30).
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 (fig. 31):
–
–
–
–
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
by an I
radio operating time.
To check the status of the device a sampling system is needed. The timing is
chosen at microprocessor level (over than half a second is recommended).
circuit protection intervention
(i.e. short circuit to GND)
circuit protection intervention
Overcurrent and short
(i.e. short circuit to GND)
each 1ms time, a sampling of the fault is done
Overcurrent and short
2
C reading. This is to ensure continuous diagnostics throughout the car-
1-2mS
1mS
Doc ID 14103 Rev 2
1mS
100mS
1mS
2
C bus and self activates if an output overload
1mS
1mS
Short circuit removed
Diagnostics functional description
1mS
1mS
t
Short circuit removed
t
Out
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