LA4820M 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA4820M

Monaural Speaker/Stereo Headphone Power Amplifier

SANYO -> Panasonic 

LA4820M

Description of External Components

(Refer to Sample Application Circuit No. 1 for device numbers.)

c R1 (∞ to 40 kΩ):

Resistor for ripple filter reference bias. Not needed when no ripple filter is used.

Resistance

None

150 kΩ

75 kΩ

40 kΩ

VCC1 − VCC2

1.17 V

0.73 V

0.52 V

0.35 V

The VCE voltage (VCC1 − VCC2) of the Tr can be

adjusted by changing the resistance value.

c R2 (270 kΩ to 100 kΩ):

c R3, R4 (30 kΩ to 10 kΩ):

c R5 (5.1 MΩ to 510 kΩ):

c R6 (510 kΩ to 0 Ω):

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.

c R7 (1 MΩ):

c R8 (270 kΩ):

c R9, R10 (510 kΩ to 10 kΩ):

c R11 (2.2 Ω):

c R12 (510 kΩ to 0 Ω):

c Q1:

c C1 (4.7 µF to 1.0 µF):

Resistance

None

100 kΩ

300 kΩ

PVSS VO

−36 dBm

−25 dBm

−18 dBm

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.

Resistance

400 kΩ

300 kΩ

220 kΩ

100 kΩ

0

PO

400 mW

290 mW

200 mW

110 mW

43 mW

The limiter level can be adjusted by changing the

resistance value.

Ripple filter output Tr (2SB1295 hFE6 recommended).

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.

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):

Capacitance 100 Hz SVRR 1 kHz SVRR

4.7 µF

40 dB

60 dB

2.2 µF

34 dB

54 dB

1.0 µF

28 dB

48 dB

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 VREF amplifier reference bias.

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.

No.5205-12/20

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