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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?。?/td> | 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
Pin 3. Control can be performed directly using the CPU output port, but digital noise from the CPU may worsen the
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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