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STA530 Folha de dados(PDF) 2 Page - STMicroelectronics

Nome de Peças STA530
Descrição Electrónicos  4 X 50W STEREO BASH POWER AMPLIFIER
Download  17 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA530 Folha de dados(HTML) 2 Page - STMicroelectronics

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STA530
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DESCRIPTION (continued)
In fact it's permits to build a BASH® architecture amplifier adding only few external components and a variable
Buck regulator tracking the audio signal. Notice that normally only one Buck regulator is used to supply a mul-
tichannel amplifiers system , therefore most of the functions implemented in the circuit have a summing output
pin.
The signal circuits are biased by fixed negative and positive voltages referred to Ground. Instead the final stag-
es of the output amplifiers are supplied by two external voltages that are following the audio signal . In this way
the headroom for the output transistors is kept at minimum level to obtain a high efficiency power amplifier.
The circuit contains all the blocks to build a configurable four channel amplifier.
The tracking signal for the external Buck regulator is generated from the Absolute Value Block (AVB) that rec-
tifies the audio signal. The outputs of these blocks are decoupled by a diode to permit an easy sum of this signal
for the multichannel application. The gain of the stage AVB is equal to 70 (+36.9 dB). A sophisticated circuit
performs the output transistor power detector that , with the buck regulator, reduces the power supply voltage .
Moreover, a maximum current output limiting and the over temperature sensor have been added to protect the
circuit itself. The external voltage applied to the STBY/MUTE pin forces the two amplifiers in the proper condi-
tion to guarantee a silent turn-on and turn-off.
ABSOLUTE MAXIMUM RATINGS
Notes: 1. VCD- must not be more negative than -Vs
THERMAL DATA
Symbol
Parameter
Value
Unit
+Vs
Positive supply voltage referred to pin 14 (GND)
27
V
-Vs
Negative supply voltage referred to pin 14 (GND)
-27
V
VCD+
Positive supply voltage tracking rail referred to pin 14 (GND)
20
V
VCD-
Negative supply voltage referred to -Vs (1)
-0.3
V
VCD-
Negative supply voltage tracking rail referred to pin 14 (GND)
-20
V
VPWR_Imp1
VPWR_Imp2
VTRK_1
VTRK_2
Pin 11, 10, 9, 8 Negative & Positive maximum voltage referred to
GND (pin 14)
-25 to +25
V
VPWR_Imp 3
VPWR_Imp 4
VTRK_3
VTRK_4
Pin 17, 18, 19, 20 Negative & Positive maximum voltage referred
to GND (pin 14)
-25 to +25
V
ISTBY-max
Pin 12 maximum input current (Internal voltage clamp at 5V)
500
µA
VSTBY/
MUTE
Pin 12 negative maximum voltage referred to GND (pin 14)
-0.5
V
Symbol
Parameter
Value
Unit
Tj
Max Junction temperature
150
°C
Rth j_case Thermal Resistance Junction to case .............................. ..max
1
°C/W


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