參數(shù)資料
型號(hào)： LA4485
廠商： Sanyo Electric Co.,Ltd.
英文描述： 5 W, Two-channel Power Amplifier with Very Few External Parts
中文描述： 5瓦，雙通道與極少的外部零件功率放大器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大小： 497K
代理商： LA4485
Dual-mode Operation Notes
.
Use the input capacitor C
IN
in the range of 0.22 μF to 1.0 μF.
Parameter
C
IN
= 0.22 μF
C
IN
= 1.0 μF
Start-up time (ts)
0.15 s
0.25 s
Attack noise when using the muting function
Somewhat noticeable
Good
Speaker turn-ON transient noise increased significantly when C
IN
is 2.2 μF or greater.
.
The DC (filter) capacitor should be 100 μF or greater.
Parameter
100 μF or less
100 μF or more
Standby-off output capacitor
discharge circuit
*1. Does not operate.
Repeated on/off: poor
*2. Operates normally.
On/off: good
Ripple rejection ratio (SVRR)
Somewhat worse
40 dB
Good
50 dB
V
N
rise rate when main or
standby is turned ‘‘on’’
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 V
N
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 C
O
is 1,000 μF.
Smaller capacitance will worsen the roll-off frequency f
L
and P
O
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
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
LA4485
No.3680-9/20
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參數(shù)描述
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