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参数资料
| 型号： | LA4581MB |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.032 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | MFP-24 |
| 文件页数： | 6/10页 |
| 文件大小： | 241K |
| 代理商： | LA4581MB |
Continued from preceding page.
Pin No.
Pin Function
8
PRE MUTE
v When VCC is applied, PRE MUTE ON.
v MUTE ON conditions: V8IN ^ VCC – 0.2 V, inflow current I7 7 60 A (when VCC =3V)
9
Ripple Filter REF 2.7 V(C7 = 2.2 F to 33 F)
v Ripple Filter, Vref reference
v The Vref ripple rejection ratio worsens when C7 is made smaller.
v Rr is 55 dB for 22 F; 35 dB for 2.2 F.
10
Ripple Filter OUT 2.7 V
v Ripple rejection ratio: Rr is 38 dB when C7 = 22 F; 30 dB when C7 = 2.2 F.
v Outflow current I7 max=1mA
11
VCC 3.0 V
12
POWER GND
13
COMMON 1.2 V
14
POWER OUT1 1.2 V
v CH1 output.
15
POWER OUT2 1.2 V
v CH2 output
16
POWER MUTE 0.7 V (C10 = 1.0 F to 4.7 F)
v When connected to GND: POWER MUTE ON.
v MUTE ON conditions: V16 % 0.3 V, outflow current I16 7 2.5 A.
v C10 can be used to control MUTE TIME.
v When C10 = 2.2 F, VCC =3.0 V 0.7 sec.
17
FWD/REV SW (C11
% 0.47 F)
v When connected to GND, PRE IN1R (pin 2) and IN2R (pin 23) turn on.
v When floating, PRE IN1F (pin 3) and IN2F (pin 22) turn on.
v C11 and R7 are intended for smoothing at the time of switching.
v REV condition: V17 % 0.2 V.
18
POWER IN2 1.8 V
v Input resistance RIN 7 30 k
19
SW OUT2 1.8 V
v Provides PRE AMP2 when pin 8 is floating (PRE MUTE OFF) (equivalent to pin 20).
v Disconnects from PRE AMP2 and RIN ^ 500 k when pin 8 is VCC (PRE MUTE ON).
20
PRE OUT2 1.8 V
v Like pin 19, 10 k
load drivable.
21
PRE NF2 1.8V
22
PRE IN2F 1.8 V
v Turns on when pin 17 is floating.
v A bias resistor (2.2 k
) must be connected between pin 22 and pin 24 (Vref) when no head is in use.
23
PRE IN2R 1.8 V
v Turns on when pin 17 is connected to GND.
v A bias resistor (2.2 k
) must be connected between pin 23 and pin 24(Vref) when no head is in use.
24
Vref 1.8 V
v The reference voltage is set to 3/5
× VCC. Because Vref AMP (rO 7 10 ) is built in, C17 can be made smaller (1 F).
v Inflow/outflow current I24 = ± 500 A available.
Sample Application:
Radio set application.
As shown above, Radio on and
Pre Mute can be implemented with one-circuit
switch.
LA4581MB
No.3535-5/10
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| LA4582 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Pre Power Amplifier for 3-V Headphone Stereo Systems |
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