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參數(shù)資料
| 型號(hào)： | STA530 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | 4 X 50W STEREO BASH POWER AMPLIFIER |
| 中文描述： | 4 × 50瓦立體聲BASH功放 |
| 文件頁(yè)數(shù)： | 2/17頁(yè) |
| 文件大?。?/td> | 278K |
| 代理商： | STA530 |
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STA530
2/17
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. V
CD-
must not be more negative than -Vs
THERMAL DATA
Symbol
Parameter
Value
Unit
+V
s
Positive supply voltage referred to pin 14 (GND)
27
V
-V
s
Negative supply voltage referred to pin 14 (GND)
-27
V
V
CD+
Positive supply voltage tracking rail referred to pin 14 (GND)
20
V
V
CD-
Negative supply voltage referred to -Vs
(1)
-0.3
V
V
CD-
Negative supply voltage tracking rail referred to pin 14 (GND)
-20
V
V
PWR_Imp1
V
PWR_Imp2
V
TRK_1
V
TRK_2
Pin 11, 10, 9, 8 Negative & Positive maximum voltage referred to
GND (pin 14)
-25 to +25
V
V
PWR_Imp 3
V
PWR_Imp 4
V
TRK_3
V
TRK_4
Pin 17, 18, 19, 20 Negative & Positive maximum voltage referred
to GND (pin 14)
-25 to +25
V
I
STBY-max
Pin 12 maximum input current (Internal voltage clamp at 5V)
500
μ
A
V
STBY/
MUTE
Pin 12 negative maximum voltage referred to GND (pin 14)
-0.5
V
Symbol
Parameter
Value
Unit
T
j
Max Junction temperature
150
°C
R
th j_case
Thermal Resistance Junction to case
.............................. ..
max
1
°
C/W
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