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參數(shù)資料
| 型號： | NCS8353MNTXG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | 20W CLASS D AUDIO AMP 32QFN |
| 標準包裝： | 2,500 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 20W x 2 @ 8 歐姆 |
| 電源電壓： | 8 V ~ 26 V |
| 特點： | 消除爆音，差分輸入，靜音，短路和熱保護，關機 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 32-QFN（5x5） |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 包裝： | 帶卷 (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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