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參數(shù)資料
| 型號： | NCP9004 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 2.65 W Filterless Class−D Audio Power Amplifier |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 323K |
| 代理商： | NCP9004 |
NCP9004
http://onsemi.com
15
Figure 43. NCP9004 Application Schematic with Single Ended Input Configuration
Figure 44. NCP9004 Application Schematic with Differential Input Configuration and
High Pass Filtering Function
OUTM
OUTP
Cs
GND
R
i
SD
INP
INM
VP
Input from
Microcontroller
Differential
Audio Input
from DAC
R
i
FERRITE
CHIP BEADS
C
i
C
i
OUTM
OUTP
Cs
GND
R
i
SD
INP
INM
VP
Input from
Microcontroller
Single
Ended Audio Input
from DAC
R
i
C
i
C
i
PCB Layout Information
NCP9004 is suitable for low cost solution. In a very small
package it gives all the advantages of a Class
D audio
amplifier. Due to its fully differential capability, the audio
signal can only be provided by an input resistor. If a low pass
filtering function is required, then an input coupling
capacitor is needed. The values of these components
determine the voltage gain and the bandwidth frequency.
The battery positive supply voltage requires a good
decoupling capacitor versus the expected distortion.
When the board is using Ground and Power planes with
at least 4 layers, a single 4.7
F filtering ceramic capactior
on the bottom face will give optimized performance.
A 1.0 F low ESR ceramic capacitor can also be used with
slightly degraded performances on the THD+N from 0.06%
up to 0.2%.
In two layer application, if both V
p
pins are connected on
the top layer, two decoupling capacitors will improve the
THD+N level. For example, a pair of capactors, 470 nF and
4.7 F, are good choices for filtering the power supply.
The NCP9004 power audio amplifier can operate from
2.5 V until 5.5 V power supply. With less than 2% THD+N,
it delivers 500 mW rms output power to a 8.0 load at
V
p
=3.0 V and 1.0 W rms output power at V
p
= 4.0 V.
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