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參數(shù)資料
| 型號： | STA575 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | DISCONNECT SWITCH+HANDLE 600VAC 30A IEC |
| 中文描述： | 100 100W的立體聲BASH功放 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 278K |
| 代理商： | STA575 |
13/20
STA575
APPLICATION HINTS
(refer to fig. 6)
PREAMPLIFIER AND COMPRESSOR
In the test circuit showed in figure 6, R
1
/R
3
(or R
2
/R
4
) ratio fix the gain of the preamplifier.
If the input signal is very low, is possible to increase the gain fixing the product Vin
G = cost.
In that case is possible to increase G decreasing R
1,2
from 10K
until 2K
without relevant effetcs on the cir-
cuitbehavior and remaining in the operating range I
in_max
= V
in_max
/R
1(2)
,<1mA.
So it is possible to increase the preamplifier gain until 25.
If no compression is present (equivalnt compressor Gm=0), the effects are:
– The output voltage offset increase
– The SNR decrease
The following table shows these variations:
R
3(4)
= 50K
and all the other external components are the same
Attenuation = 0 dB
If the compression is active the circuit behaviour is the same.
It”s also possible to eliminate the compressor. In this case the ATT_REL (1,2) pin must be connected to gnd.
STBY-MUTE CIRCUIT
In the suggested application circuit (figure 6), the resistor for Standby/Mute function (R
13
) is connected between
the Standby/Mute switches and 5V Supply.
It is possible to connect the resistor to another Supply Voltage level V
L
, but in that case also the resistor value
(R
13,14
) must be changed according to the following formula (fixing V
STBY/MUTE
= 2.5V and R
15
= 10K
):
HEADROOM
In the suggested application circuit the supply voltage to obtain 75W (Power Output) on 8
(R
load
)
is:
It is also possible to increase the system’s efficiency forcing the headroom to follow the output signal (variable
drop insteadof a constant drop).
In that case:
V
supply
+
=
R
1,2
V
IN MAX
G
V
OFFSET
EN
10K
8V
5
15mV
10
μ
V
5K
4V
10
30mV
13
μ
V
2K
1.6V
25
75mV
20
μ
V
R
13
4 V
L
10
–
(
)
K
=
R
14
4 V
L
10
+
(
)
K
=
V
supply
V
I
L MAX
R
DSon
+
=
V
I
L
V
( )
R
DSon
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