LA4743 查看數據表（PDF） - SANYO -> Panasonic
零件编号
产品描述 (功能)
生产厂家
LA4743 Datasheet PDF : 9 Pages
| |||
LA4743B
Notes on Usage and Handling
• Oscillator stabilization time
In some cases, details of the printed circuit board layout may lead to induced parasitic oscillation. This oscillation can
be prevented by adding any one of the following components. Verify the optimal values for these capacitors by testing
in actual end products.
Technique 1 ... Connect Mylar capacitors (0.1 µF) between the BTL amplifier outputs.
Technique 2 ... Connect an RC circuit (2.2 Ω and 0.1 µF in series) between each output and ground.
• Audio quality (low band)
The low-band frequency characteristics can be improved by adjusting the values of the input capacitors. The
recommended value is 2.2 µF.
• Impulse noise
The LA4743B includes a built-in impulse noise suppression circuit. However, further improvement can be achieved by
using the muting circuit. When first applying power, activate the muting function at the same time as applying power.
Then, after the output DC potential has stabilized, turn off the muting function. When turning off the power, first
activate the muting function and then turn off the power. Sample transient responses are attached (see the timing
charts).
Transient Responses at Power On
Power on: Standby and muting activated at the same time.
Muting is turned off after the output has stabilized.
MUTE
Standby set high
MUTE OFF
5 [V]
External 10 kΩ muting switch
0
5 [V] Standby pin
0 [V]
ON TIME
Transient Responses at Power Off
200 ms/div
Power off: After activating the muting circuit, turn the power off.
4
Output pin
2
Mute 10 kΩ
22
0
+
3.3 µF
MUTE
Standby set low
200 ms/div
5 [V]
0 External 10 kΩ muting switch
5 [V]
0 [V] Standby pin
4
2 Output pin
Mute 10 kΩ
0
22
+
3.3 µF
No. 6630-6/9
Share Link: 