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參數(shù)資料
| 型號： | STA5150 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | 200W MONO BASH POWER AMPLIFIER |
| 中文描述： | 功率200W單聲道BASH功放 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 146K |
| 代理商： | STA5150 |
9/14
STA5150
Figure 2. Compressor attenuation vs. input amplitude
ABSOLUTE VALUE BLOCK
The absolute value block rectifies the signal after the compression to extract the control voltage for the external
digital converter. The output voltage swing is internally limited, the gain is internally fixed to 14.
The input impedance of the rectifier is very high , to allow the appropriate filtering of the audio signal before the
rectification (between Out_pre and Trk pins).
OUTPUT BRIDGE
The Output bridge amplifier makes the single-ended to Differential conversion of the Audio signal using two
power amplifiers, one in non-inverting configuration with gain equal to 2 and the other in inverting configuration
with unity gain. To guarantee the high input impedance at the input pins, Pwr_Inp1 and Pwr_Inp2, the second
amplifier stages are driven by the output of the first stages respectively.
POWER PROTECTION
To protect the output transistors of the power bridge a power detector is implemented (fig 3).
The current flowing in the power bridge and trough the series resistor Rsense is measured reading the voltage
drop between CD+1 and CD+. In the same time the voltage drop on the relevant power (Vds) is internally mea-
sured. These two voltages are converted in current and multiplied: the resulting current , Ipd, is proportional to
the instantaneous dissipated power on the relevant output transistor. The current Ipd is compared with the ref-
erence current Ipda, if bigger (dissipated power > 64W) a current, Iprot, is supplied to the Protection pin. The
aim of the current Iprot is to reduce the reference voltage for the digital converter supplying the power stage of
the chip, and than to reduce the dissipated power. The response time of the system must be less than 200
μ
Sec
to have an effective protection. As further protection, when Ipd reaches an higher threshold (when the dissipated
value is higher then 120W) the chip is shut down, forcing low the Stby/Mute pin, and the turn on sequence is
restarted.
1
-24
-18
-12
-6
0
2
3
4
5
6
7
8
|Vinpk|
Attenuation(dB)
D01AU1265
|Vh=1
|Vth=2.5|
|Vth=5|
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| STA538B | Zener Diode; Application: General; Pd (mW): 400; Vz (V): 25.63 to 26.95; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: MHD |
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