开关电源Spread Spectrum技术相关问题

HI

     TI的DC/DC都是定频的（轻载为提升效率，会进入FPM模式，是变频率的），很多都是通过外部电阻来确认频率，也可以通过外部CLK同步频率。

     关于EMI你还需要注意layout.

你说得不对啊，好好看看TI的datasheet tps62810

如下是里面的一句话：
The device offers spread spectrum clocking as an option. For the devices that have SSC enabled, the switching
frequency is randomly changed in PWM mode when the internal clock is used.

Spread spectrum技术就是为了扩频来降低EMI的幅度的。

Hi

    

         Pin脚定义：

        COMP/FSET:  Device compensation and frequency set input. A resistor from this pin to GND defines the compensation of the control loop as well as the switching frequency if not externally synchronized.

       MODE/SYNC: The mode pin can also be used to synchronize the device to an external frequency. See the electrical characteristics for the detailed specification for the digital signal applied to this pin for external synchronization.

在PWM模式使用内部频率时，是可以随机改变PWM频率来实现扩频来降低EMI的啊。