NUCLEO-STM32H7A3ZI-Q怎么使用？

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  LDOs are simple to regulate, create very little noise and requires no inductor for operation. They also produce a highly accurate output voltage, making them an attractive choice in many aspects. On the other hand, the use of a pass transistor creates excessive heat, leading to reliability issues and low efficiency levels. LDOs are most often used in low-power applications where these drawbacks are minimized by the nature of the application.
  SMPSs main benefit, as mentioned, is their extremely high efficiency and low heat levels. SMPSs typically have efficiency levels above 80%. The main drawbacks are the complexity involved in regulation, the cost to build an SMPS system, and the fact that SMPSs can create high levels of noise and ripple, which decreases the accuracy of output voltage. SMPSs are usually used in high power applications.
  Both power supplies have their advantages and disadvantages. The automation power supply plays a big role in the overall operations of the system, so it’s important to choose the one that’s best for your application. Knowing both can help you choose the right one for your automation system.

  通过从外部DC/DC（直流/直流）转换器而不是集成LDO生成VCORE逻辑供电来提高运行模 式下的能效。这些器件（标有后缀“P”）使用不同的引脚排列，用两个必须连接到外部 SMPS的VDD12供电引脚取代两个GPIO引脚。因此，可用GPIO的数量减少了2个。“运行 ”模式下的预期功耗增益可高至~60%。

• 对于“CoreMark/功耗”，代码置于ITCM较位于FLASH低。
  
• 打开Cache和功耗脚没有打开高。
  
• 相对而言，核心频率越低，VOS可调得越低。因此"核心频率/功率"在核心频率较低有较大值。
  
• 相比于STM32H743,STM32H7A3在STOP模式下的功耗更低，而Standby模式下功耗相似。
  
• STM32H743仅有LDO和CAP核心供电方式，LDO供电方式功耗较高。而STM32H7A3还具有SMPS核心供电公式，功耗较低。