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參數(shù)資料
| 型號： | 2SJ492-S |
| 元件分類： | JFETs |
| 英文描述： | 20 A, 60 V, 0.185 ohm, P-CHANNEL, Si, POWER, MOSFET, TO-262AA |
| 封裝： | TO-262, 3 PIN |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 266K |
| 代理商： | 2SJ492-S |
LA4815VH
No.A1374-7/15
3. Mute control pin (Pin 3)
The internal power amplifier circuit can be disabled and audio mute is turned on by controlling the voltage applied to
LA4815VH noise floor. Therefore, inserting a series resistor, Rm1 (1 to 2.2k
) as shown in Fig. 6, is recommended.
Mute ON : Low
Mute OFF : High or open
In addition, the Pin 3 DC voltage is dependent on the supply voltage, so a reverse current flows to the CPU power
supply line when the Pin 3 voltage is higher than the CPU supply voltage. In these cases, connect a resistor, Rm2 (see
Fig. 7) between Pin 3 and GND to lower the Pin 3 DC voltage as shown in Fig. 6.
Note that when not using the mute function, Pin 3 must be left open.
Figure 6
Reverse current prevention resistor value : Rm2 (reference value)
← When V3 is set to approximately 2.5V
Figure 7
4. Mute control timing
When performing mute control, exercise control at the timing shown in Fig. 8.
During power-on : Twu = 0 to 50ms
* Pins 2 and 3 can also rise simultaneously.
During power-off : Twd = 100 to 200ms
Figure 8
Pin 2
(VCC)
Pin 3
(MUTE)
Twd
Twu
Rm1
1k
Rm2
VDD
VSS
CPU
I/O
port
LA4815VH
GND
VCC
30k
30k
40k
10k
3
* For reverse
current prevention
Rm2 – VCC
10
100
7
5
3
2
7
5
3
2
1000
610
12
14
16
18
820
Impedance,
Rm2
–
k
Supply voltage, VCC –V
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