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参数资料
| 型号： | LA4820M |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.12 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | MFP-24 |
| 文件页数： | 4/21页 |
| 文件大小： | 637K |
| 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
VCC1–VCC2
None
1.17 V
150 k
0.73 V
75 k
0.52 V
40 k
0.35 V
The VCE voltage (VCC1– VCC2) 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
PVSS VO
None
–36 dBm
100 k
–25 dBm
300 k
–18 dBm
c R7 (1 M
):
Pull-down (discharging) resistor for SP/HzP switching.
c R8 (270 k
):
Pull-up (charging) resistor for SP/HzP switching.
c R9, R10 (510 k
to 10 k):
HzP 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
PO
400 k
400 mW
300 k
290 mW
220 k
200 mW
100 k
110 mW
043 mW
The limiter level can be adjusted by changing the
resistance value.
c Q1:
Ripple filter output Tr (2SB1295 hFE6 recommended).
Not needed when using no ripple filter.
c C1 (4.7 F to 1.0 F):
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
100 Hz SVRR
1 kHz SVRR
4.7 F
40 dB
60 dB
2.2 F
34 dB
54 dB
1.0 F
28 dB
48 dB
c C2 (0.1 F to 0.01 F):
Capacitor for smoothing (shock noise prevention) when power mute is turned off.
c C3 (3.3 F to 0.22 F):
Coupling capacitor for the MIX amplifier output and the BTL amplifier input.
c C4 (100 F to 0.1 F):
Decoupling capacitor for virtual grounding and high-region noise cleaning.
c C5 (4.7 F to 1.0 F):
LPF pin for VREF amplifier reference bias.
Ripple rejection ratio can be varied by changing the capacitance.
c C6 (22 F to 3.3 F):
LPF capacitor for internal ripple filter reference bias.
Ripple rejection ratio can be varied by changing the capacitance.
c C7 (33 F to 10 F):
ALC rectifying capacitor for PVSS, output limiter and non-clipping circuit.
LA4820M
No.5205-12/21
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