STA530 데이터 시트보기 (PDF) - STMicroelectronics
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STA530 Datasheet PDF : 17 Pages
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STA530
FUNCTIONAL DESCRIPTION
The circuit contains all the blocks to build a configurable four channel amplifier.
In fact, only driving properly the TRK_2 (and TRK_4) pins, it’s possible to change the chip configuration:
– 50 Watt x 4
– 50 Watt x 2 + 100 Watt x1 (TRK_2/Par1&2 or TRK_4/Par3&4 at -Vs)
– 100 Watt x 2 (TRK_2/Par1&2 and TRK_4/Par3&4 at -Vs)
Each single channel is based on the Output Bridge Power Amplifier, and its protection circuit. Moreover, a sig-
nal rectifier are added to complete the circuit.
The operation modes are driven by The Turn-on/off sequence block. In fact the IC can be set in three states by
the Stby/mute pin:
STANDBY ( Vpin < 0.8V), MUTE (1.6V < Vpin < 2.5V), and PLAY (Vpin > 4V).
In the Standby mode all the circuits involved in the signal path are uninhabited, instead
in Mute mode the circuits are biased but the Speakers Outputs are forced to ground potential.
These voltages can be get by the external RC network connected to Stby/Mute pin.
The same block is used to force quickly the I.C. In standby mode or in mute mode when the I.C. dangerous
condition has been detected. The RC network in these cases is used to delay the Normal operation restore.
The protection of the I.C. are implemented by the Over Temperature, Unbalance Ground, Output Short circuit,
Under voltage, and output transistor Power sensing as shown in the following table:
Table 1. Protection Implementation
Fault Type
Condition
Chip Over
temperature
Tj > 130 °C
Chip Over
temperature
Tj > 150 °C
Unbalancing
Ground
|Vgnd| > ((CD+) -
(CD-))/2 + 5V
Over Current
Iout > 4.5A
Short circuit
Iout > 5A
Under Voltage
|Vs+| + |Vs-|< 20V
Extra power
dissipation
at output transistor
Maximum power
dissipation
at output transistor
Pd tr. > 18W
Pd tr. > 30W
Protection strategy
Action time
Mute
Fast
Standby
Fast
Standby
Fast
Reducing Buck
regulator output
voltage.
Standby
Related to the Buck
regulator
Fast
Standby
Fast
Reducing Buck
regulator output
voltage.
Standby
Related to the Buck
regulator
Fast
Release time
Slow Related to
Turn_on sequence
Slow, Related to
Turn_on sequence
Slow, Related to
Turn_on sequence
Related to the Buck
regulator
Slow, related to
Turn_on sequence
Slow, related to
Turn_on sequence
Related to the Buck
regulator
Slow, related to
Turn_on sequence
ABSOLUTE VALUE BLOCK
The absolute value block rectifies the signal to extract the control voltage for the external Buck regulator. The
output voltage swing is internally limited, the gain is internally fixed to 70.
The input impedance of the rectifier is very high , to allow the appropriate filtering of the audio signal before the
rectification.
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