TDA7572 STMicroelectronics, TDA7572 Datasheet - Page 51

• Manufacturer Part Number: TDA7572
• Description: IC AMP PWM 200W BRIDGE 64HIQUAD
• Manufacturer: STMicroelectronics
• Type: Class Dr

Specifications of TDA7572

• Output Type: 1-Channel (Mono)
• Voltage - Supply: 8 V ~ 58 V
• Features: Digital Inputs, I²C, I²S, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 64-HiQUAD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -

TDA7572
10.1.8
Events that put in tri-state the Modulator:
Events that enable the Fault Pin without I
Events that enable the SCR:
Faults during power-up:
This is a power-up diagnostic useful to detect: load short to ground, load short to supply,
short across the transducer, open transducer. The PUD could be performed with and
without I
●
●
These are the thresholds to take into account for short to ground and short to supply
Voltage threshold
–
–
–
–
–
–
–
–
–
–
–
I
then charged by a Thevenin circuits with R = 155 kOhm and supply equal to 1.75V. The
value of capacitor is choose in order to have an audible charge ramp and at the same
time in order to have an acceptable charge time. The diagnostic time start when the
TestC pin reaches the 98% of full charge. During the diagnostic time of 100 ms a
current equal to
The drop across the load produced by this current is continuously monitored. A fault is
detected if the drop and/or the absolute value of pin HB1Out and HB2Out are abnormal
for the full 100 ms period set when a fault is detected the correspondent bit in the Fault1
register is set and the diagnostic keep running until the fault is present. In case no fault
is detected after the 100 ms period the capacitor is discharged and the current on the
load is reduced down to zero. When this current is at the 2% of is nominal value the bit
4 of Fault1 register is set to zero. Pulling this register the operator could understand the
state of diagnostic. Note that during diagnostic cycle the output FET are in tristate.
No I
differences are about the habilitation, which is selected by the mode, and the assertion
of fault presence, which is done trough the addr0/Fault pin. At the end of diagnostic the
Fault pin is for sure low and the external FET start to commute.
2
Cbus: setting the bit 4 of Fault1 register the diagnostic begin. The capacitor TestC is
2
2
C bus.
Diagnostic on
Offset detection
Output over-current second threshold trespassed
Diagnostic Fault
Junction thermal warning
External thermal warning
Supply current over-threshold
Offset detection
Over-temperature protection
Output over-current second threshold trespassed
Supply current over-threshold
C bus: The operation of diagnostic is equal to the one with I
VSM
SGND
VSM+1V
I
=
2
C bus:
----------------------- -
3 RISet
X
⋅
2.45
VSM+2V
operation
Normal
VSM+5.5V
2
C bus. The only
X
VSM+8V
Diagnostics
SVCC
VSP
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