LA4485 查看數據表（PDF） - SANYO -> Panasonic

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LA4485

5 W, Two-channel Power Amplifier with Very Few External Parts

SANYO -> Panasonic 

LA4485

Dual-mode Operation Notes

. Use the input capacitor CIN in the range of 0.22 µF to 1.0 µF.

Parameter

Start-up time (ts)

Attack noise when using the muting function

CIN = 0.22 µF

0.15 s

Somewhat noticeable

CIN = 1.0 µF

0.25 s

Good

Speaker turn-ON transient noise increased significantly when CIN is 2.2 µF or greater.

. The DC (filter) capacitor should be 100 µF or greater.

Parameter

Standby-off output capacitor

discharge circuit

Ripple rejection ratio (SVRR)

VN rise rate when main or

standby is turned ‘‘on’’

100 µF or less

*1. Does not operate.

Repeated on/off: poor

Somewhat worse

40 dB

100 µF or more

*2. Operates normally.

On/off: good

Good

50 dB

Fast

Slow

Note:

*1. Slow as a result of natural discharge.

*2. Approximately 0.3 seconds as a result of forced discharge.

. Use the standby supply capacitor in the range of 0.22 µF to 0.47 µF.

The VN trace for standby OFF changes and speaker turn-ON transient noise is increased significantly when the capacitor is 1 µF

or greater. If the standby function is not used, this capacitor must be removed and pin 9 must be pulled up to the power supply.

. The output capacitor’s recommended value for CO is 1,000 µF.

Smaller capacitance will worsen the roll-off frequency fL and PO in a low range.

. The recommended power supply capacitor is approximately 2,200 µF, but other capacitors than 2,200 µF can be used according

to the application’s design.

Using a capacitor with this value, the load on the supply can be as high as 56 Ω while still providing good supply stability

during momentary supply glitches. Note that using a 0.15 µF capacitor can cause oscillations if the supply impedance increases.

(Example: Mild oscillation results if the power supply capacitor is open.)

. STANDBY pin 9 IC internal circuit

. MUTE pin 10 IC internal circuit

No.3680-9/20

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