la4820m Sanyo Semiconductor Corporation, la4820m Datasheet - Page 12

• Manufacturer Part Number: la4820m
• Description: Monaural Speaker/stereo Headphone Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

Description of External Components
(Refer to Sample Application Circuit No. 1 for device numbers.)
c R1 ( to 40 k ):
c R2 (270 k
c R3, R4 (30 k
c R5 (5.1 M
c R6 (510 k
c R7 (1 M ):
c R8 (270 k ):
c R9, R10 (510 k
c R11 (2.2
c R12 (510 k
c Q1:
c C1 (4.7 µF to 1.0 µF):
c C2 (0.1 µF to 0.01 µF):
c C3 (3.3 µF to 0.22 µF):
c C4 (100 µF to 0.1 µF):
c C5 (4.7 µF to 1.0 µF):
c C6 (22 µF to 3.3 µF):
c C7 (33 µF to 10 µF):
):
to 100 k ):
to 0
to 510 k ):
to 0
to 10 k ):
to 10 k ):
):
):
Resistor for ripple filter reference bias. Not needed when no ripple filter is used.
Resistor for smoothing (shock noise prevention) when power mute is turned on.
Volume.
Resistor for PVSS, output limiter, and non-clipping circuit recovery.
PVSS output level variable resistor. Not needed when using no PVSS.
Pull-down (discharging) resistor for SP/HzP switching.
Pull-up (charging) resistor for SP/HzP switching.
HzP output mixing resistors for PVSS. Not needed when using no PVSS.
Resistor for blocking common amplifier oscillation. Not needed when the common
amplifier is turned off.
Output limiter level variable resistor. Not needed when no output limiter is used.
Ripple filter output Tr (2SB1295 h
Not needed when using no ripple filter.
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.
Capacitor for smoothing (shock noise prevention) when power mute is turned off.
Coupling capacitor for the MIX amplifier output and the BTL amplifier input.
Decoupling capacitor for virtual grounding and high-region noise cleaning.
LPF pin for V
Ripple rejection ratio can be varied by changing the capacitance.
LPF capacitor for internal ripple filter reference bias.
Ripple rejection ratio can be varied by changing the capacitance.
ALC rectifying capacitor for PVSS, output limiter and non-clipping circuit.
Capacitance 100 Hz SVRR 1 kHz SVRR
4.7 µF
2.2 µF
1.0 µF
Resistance
Resistance
Resistance
150 k
100 k
300 k
400 k
300 k
220 k
100 k
75 k
40 k
None
None
0
REF
amplifier reference bias.
40 dB
34 dB
28 dB
LA4820M
V
CC
PVSS V
−36 dBm
−25 dBm
−18 dBm
400 mW
290 mW
200 mW
110 mW
43 mW
1.17 V
0.73 V
0.52 V
0.35 V
1 − V
P
O
CC
O
2
60 dB
54 dB
48 dB
FE
6 recommended).
The limiter level can be adjusted by changing the
resistance value.
The V
adjusted by changing the resistance value.
CE
voltage (V
CC
1 − V
CC
2) of the Tr can be
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