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LA4450-E датащи(PDF) 4 Page - ON Semiconductor

номер детали LA4450-E
подробное описание детали  Power Amplifier
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LA4450-E датащи(HTML) 4 Page - ON Semiconductor

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LA4450
No.4090-4/8
Test Circuit
+
+
+
+
+
10k
Ω
ST
DC
VCC
VCC=26.4V
BS1
BS2
OUT1
OUT2
CH1
PWR
GND
CH2
PWR
GND
NF2
IN2
PRE
LA4450
GND
NF1
IN1
100
μF
1000
μF
1000
μF
0.15
μF
2.2
Ω
RL=8Ω
RL=8Ω
47
μF
1000
μF
100
μF
100
μF
47
μF
0.15
μF
2.2
Ω
IN1
IN2
5V
+
CH1
+
CH2
ON
OFF
+
+
+
+
2
3
1
4
5
6
7
10
9
8
11
13
14
12
*
*Polyester Film Capacitor
*
1. Features and Usage Notes
 Pin 12 is the standby pin. The IC operates when a voltage of 2V or higher is applied through the external resistor R1.
Note that the maximum influx current to pin 12 is 500
A.
 Changing the voltage gain
+
+
CNF
RNf’
75
Ω
30K
Ω
IN
NF
OUT
The voltage gain VG can be lowered by connecting an
external resistor in series between the NF pin (pins 8 and 14)
and CNF.
VG = 20log
30k
75
RNf ’
However, since the IC may oscillate if VG is 30dB or lower,
use a VG of 36dB or higher.
 The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal
overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate.
 The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal
voltages. This circuit has hysteresis characteristics : it operates at between 39 and 40V, and recovers at around 34V.
 Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still be
exercised to prevent load shorts and other excessive current conditions.


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