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参数资料
| 型号： | LA4901 |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 10 W, 1 CHANNEL, AUDIO AMPLIFIER, DIP28 |
| 封装： | 0.500 INCH, DIP-28 |
| 文件页数： | 6/11页 |
| 文件大小： | 131K |
| 代理商： | LA4901 |
LA4901
No.7058-4/11
Block Diagram
On time muting
circuit
Voltage
Regulator
H. L. S
Amplifier standby switch
Impulse noise
prevention circuit
Switching regulator block
H. L. S
Higher
Level signal
Selector
*
Input amplifier
Nonlinear amplifier
Beep amplifier
Output
amplifier
Output amplifier
Power GND
OUT+
OUT--
VCC
VCC(SW)
R4
2.2
Ω
C10
2.2
μF / 6.3V
C9
2.2
μ
F
/
6.3V
C1
1
2.2
μ
F
/
6.3V
*
C2
0.047
μ
F
R2
2.2
Ω
R3
2.2
Ω
200
μ
H
C3
47
μ
F
/
25V
100
μF / 10V
HP OUT
HP D. C
*
C8
0.1
μ
F
C6
1000pF
C5
1000
μ
F
/
25V
+B
*
C7
0.1
μ
F
SW OUT
SW E
SW B
SW GND
D1
Flywheel diode
TR1
Switching transistor
1A fT = 30 to 50MHz
Headphone
L ch
VG=6dB
AB
A
B
* = Polyester film capacitor
Power GND
Top view
Power GND
BEEP
IN
PRE GND
ON TIME
AMP Standby
H / P Standby
HP IN
D. C
R5
10k
Ω
C13
1
μF / 10V
+5V
R6
10k
Ω
+5V
C12
47
μ
F
/
25V
+
R
+
Ripple filter
3
4
5
26
15
18
25
24
22
21
20
6
7
8
9
10
11
12
13
14
Headphone standby switch
2
Ripple filter
27
1
28
23
16
19
Switching drive
17
10
Ω
C4
2.2
μ
F
/
25V
(OS
capacitor)
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