TDA7575PD STMicroelectronics, TDA7575PD Datasheet - Page 19

• Manufacturer Part Number: TDA7575PD
• Description: IC AMP AUDIO PWR 150W POWERSO36
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7575PD

• 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: Surface Mount
• Package / Case: PowerSO-36 Exposed Top Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DOCUMENT CD00003142
Copyright STMicroelectronics
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
provided that the diagnostic is enabled. This is true for both kinds of diagnostic (Turn on and Permanent).
The table below shows all the couples of double-fault possible. It should be taken into account that a short circuit
with the 4 ohm speaker unconnected is considered as double fault.
Double fault table for Turn On Diagnostic
S. GND (so) / S. GND (sk) in the above table make a distinction according to which of the 2 outputs is shorted
to ground (test-current source side= so, test-current sink side = sk). More precisely, in both the Channels SO =
CH+, and SK = CH-.
In Permanent Diagnostic the table is the same, with only a difference concerning Open Load(*) , which is not
among the recognisable faults. Should an Open Load be present during the device's normal working, it would
be detected at a subsequent Turn on Diagnostic cycle (i.e. at the successive Car Radio Turn on).
FAULTS AVAILABILITY
All the results coming from I
period of time. If the fault is stable throughout the whole period, it will be sent out. This is true for DC diagnostic
(Turn on and Permanent), for Offset Detector.
To guarantee always resident functions, every kind of diagnostic cycles (Turn on, Permanent, Offset) will be
reactivate after any I2C reading operation. So, when the micro reads the I
but the read data will come from the previous diag. cycle (i.e. The device is in Turn On state, with a short to Gnd,
then the short is removed and micro reads I2C. The short to Gnd is still present in bytes, because it is the result
of the previous cycle. If another I2C reading operation occurs, the bytes do not show the short). In general to
observe a change in Diagnostic bytes, two I2C reading operations are necessary.
I
A correct turn on/off sequence respectful of the diagnostic timings and producing no audible noises could be as
follows (after battery connection):
Car Radio Installation: DIAG ENABLE (write) --- 200 ms --- I
(repeat I
2
C PROGRAMMING/READING SEQUENCES
– TURN-ON: (STAND-BY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT
– TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STAND-BY IN)
– OFFSET TEST: Device in Play (no signal) --
– OFFSET ENABLE - 30ms - I
S. Across L.
S. GND (sc)
S. GND (sk)
Open L.
S. Vs
2
C reading until high-offset message disappears).
REVISION 3.0
S. GND (sc)
S. GND
/
/
/
/
2
Cbus, by read operations, are the consequence of measurements inside a defined
2
C reading
S. GND (sk)
S. GND
S. GND
/
/
/
COMPANY INTERNAL
ACTIVE
S. Vs + S. GND
2
C read (repeat until All faults disappear).
S. Vs
S. Vs
S. Vs
/
/
2
C, a new cycle will be able to start,
S. Across L.
S. Across L.
S. GND
S. GND
2
Unauthorized reproduction and communication strictly prohibited
C reading and faults removal,
S. Vs
/
DATE 22-Mar-2004
TDA7575PD
Open L. (*)
Open L. (*)
Open L.
S. GND
S. Vs
N.A.
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