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发表于: 2018-6-14 09:03:14
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关于RT300M空载/轻载时微噪音的说明
RT300M采用了CR5822电源芯片，有skip cycle跳周期，也就是空载间歇模式，还有轻载PFM模式，这两种状态下会有音频噪声，重负载时进入pwm模式，噪声就变得很小，甚至听不到噪音。
因为负载功率范围宽，想要去掉待机状态噪音的话，就需要给电源加入足够的假负载，强制电源工作在pwm模式，可以解决噪音问题，但是待机功耗非常大、电源成本也会增加不少。另一个解决方法是R15和R20都不安装，噪音可以明显改善，但是整机的极限功率会有所下降。如果用户非常介意噪音问题，可以自行拆掉电源芯片旁边的R15/R20两颗电阻(序列号111以后的均已去掉电阻)。
The explanation about the RT300M faint noise
RT300M uses CR5822 power chip，and it has skip cycle, which is the no-load intermittent mode. Besides, it also has the light load PFM mode. There will be audio-frequency noise under these two mode. But when heavy load it will enter the pwm mode, and the noise will become very samll, even can not hear.
Because of the wide power range of the load, if you want to eliminate the noise under the standby state, you need to add enough false load to the power supply. The forced power supply works in the pwm mode , which can solve the noise problem, but the standby power consumption is very large and the power supply cost is increased. Another solution is that the R15 and R20 are not installed and the noise can be significantly solved, but the limit power of the whole machine will decrease. If the user is very concerned about the noise problem, you can remove the two R15/R20 resistors next to the power chip.
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发表于: 2018-6-14 08:21:50
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发表于: 2018-11-7 21:59:03
