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參數(shù)資料
| 型號： | LA4820M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Monaural Speaker/Stereo Headphone Power Amplifier |
| 中文描述： | 單聲道喇叭/立體聲耳機功率放大器 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 677K |
| 代理商： | LA4820M |
Description of External Components
(Refer to Sample Application Circuit No. 1 for device numbers.)
c
R1 (
∞
to 40 k
):
Resistor for ripple filter reference bias. Not needed when no ripple filter is used.
Resistance
None
150 k
75 k
40 k
V
CC
1 V
CC
2
1.17 V
0.73 V
0.52 V
0.35 V
The V
CE
voltage (V
CC
1 V
CC
2) of the Tr can be
adjusted by changing the resistance value.
c
R2 (270 k
to 100 k
):
Resistor for smoothing (shock noise prevention) when power mute is turned on.
c
R3, R4 (30 k
to 10 k
):
Volume.
c
R5 (5.1 M
to 510 k
):
Resistor for PVSS, output limiter, and non-clipping circuit recovery.
c
R6 (510 k
to 0
):
PVSS output level variable resistor. Not needed when using no PVSS.
Resistance
None
100 k
300 k
PVSS V
O
36 dBm
25 dBm
18 dBm
c
R7 (1 M
):
Pull-down (discharging) resistor for SP/H
z
P switching.
c
R8 (270 k
):
Pull-up (charging) resistor for SP/H
z
P switching.
c
R9, R10 (510 k
to 10 k
):
H
z
P output mixing resistors for PVSS. Not needed when using no PVSS.
c
R11 (2.2
):
Resistor for blocking common amplifier oscillation. Not needed when the common
amplifier is turned off.
c
R12 (510 k
to 0
):
Output limiter level variable resistor. Not needed when no output limiter is used.
Resistance
400 k
300 k
220 k
100 k
0
P
O
400 mW
290 mW
200 mW
110 mW
43 mW
The limiter level can be adjusted by changing the
resistance value.
c
Q1:
Ripple filter output Tr (2SB1295 h
FE
6 recommended).
Not needed when using no ripple filter.
c
C1 (4.7 μF to 1.0 μF):
LPF capacitor for the ripple filter reference bias. Low-region ripple rejection ratio can be
varied by changing the capacitance. Not needed when using no ripple filter.
Capacitance
4.7 μF
2.2 μF
1.0 μF
100 Hz SVRR
40 dB
34 dB
28 dB
1 kHz SVRR
60 dB
54 dB
48 dB
c
C2 (0.1 μF to 0.01 μF):
Capacitor for smoothing (shock noise prevention) when power mute is turned off.
c
C3 (3.3 μF to 0.22 μF):
Coupling capacitor for the MIX amplifier output and the BTL amplifier input.
c
C4 (100 μF to 0.1 μF):
Decoupling capacitor for virtual grounding and high-region noise cleaning.
c
C5 (4.7 μF to 1.0 μF):
LPF pin for V
REF
amplifier reference bias.
Ripple rejection ratio can be varied by changing the capacitance.
c
C6 (22 μF to 3.3 μF):
LPF capacitor for internal ripple filter reference bias.
Ripple rejection ratio can be varied by changing the capacitance.
c
C7 (33 μF to 10 μF):
ALC rectifying capacitor for PVSS, output limiter and non-clipping circuit.
LA4820M
No.5205-12/20
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