参数资料
| 型号： | NCS8353MNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/14页 |
| 文件大小： | 0K |
| 描述： | 20W CLASS D AUDIO AMP 32QFN |
| 标准包装： | 2,500 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 20W x 2 @ 8 欧姆 |
| 电源电压： | 8 V ~ 26 V |
| 特点： | 消除爆音，差分输入，静音，短路和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 32-QFN（5x5） |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
NCS8353
http://onsemi.com
11
APPLICATIONS INFORMATION
Digital Power Limiter
The NCS8353 utilizes a Digital Power Limiter (DPL)
feature that limits the output power to 10 W, 12 W, 15 W, or
20 W per channel. This is achieved by the two external
power limit pins, PL0 and PL1, which are TTL level
compatible.
If a change in power limit is desired, the NCS8353 must
first be disabled followed by setting a new power limit.
Finally, when the NCS8353 is reenabled, the new power
limit will be active.
Table 1 illustrates the power limit per channel of the
NCS8353 depending on the logic level of the power limit
pins and is based on an 8
W speaker load.
Table 1.
PL1
PL0
Power Limit
0
10 W
0
1
12 W
1
0
15 W
1
20 W
Figure 16 shows a typical output waveform and a desired
output power for an application. If the output waveform
produces a higher output power than required; e.g., due to
high input amplitudes, the DPL feature of the NCS8353
activates.
Figure 16. Before DPL Operation
VDD
GND
Required
Power
The DPL reduces the internal gain of the NCS8353 thus
reduces the output voltage to ensure the programmed power
limit is not exceeded. Figure 17 illustrates the output voltage
waveform after the DPL is activated.
Figure 17. DPL Activated
VDD
GND
Power
Limit
The DPL monitors the input referred voltage level and is
dependent on the programmed gain of the NCS8353.
to verify when the DPL will activate assuming an 8
W load.
If the input voltage exceeds the input reference levels
illustrated in Table 2, the DPL will activate.
Figure 18 highlights the output power vs. input voltage for
programmed power limits.
0
5
10
15
20
25
0.05
0.1
0.15
0.2
0.25
Figure 18. Power Limiter vs. Vin
Vin, INPUT VOLTAGE (V)
P
out
(W)
PL = 15 W
PL = 20 W
PL = 12 W
PL = 10 W
VCC = 24 V
RL = 8 W
AV = 36 dB
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