For applications that require data computation and processing using field programmable gate arrays (FPgas), microprocessors, digital signal processors, and microcontrollers, it is important to ensure that the devices can operate safely and reliably.
Since these devices can only operate within a certain power tolerance range, the power supply requirements are high. 1 Voltage monitor can be used to keep the system stable and reliable operation. In the event of an unexpected power failure, such as undervoltage or overvoltage, the voltage monitor can immediately trigger action to put the system in reset mode. However, it also faces some interference factors when monitoring the voltage in the power rail, which may trigger unnecessary misreset of the output. These disturbances include power supply noise, voltage transients, and burrs that may come from the power supply circuit itself.
This article discusses the different parameters in the voltage monitor that help solve these problems of power supply noise, voltage transients, and burrs. In addition, it will discuss how these parameters can improve the reliability of the voltage monitor when monitoring the power supply, so as to improve the reliability of the system in the application.
Power supply noise, voltage transients and burrs in the system
The power supply itself is flawed. There are always coupled noise artifacts in the DC circuit, which may come from the power supply circuit components themselves, noise from other power supplies, and other noise generated by the system. If the DC power supply is a switching power supply (SMPS), these problems may be more serious. SMPS produces a switching ripple that is related to the switching frequency.
High frequency switching transients also occur during switching. These switching operations are caused by the rapid conduction disconnection of the power MOSFETs. Figure 1 shows the application circuit where the monitor is used to monitor the output of the switching regulator (i.e. the voltage source of the microcontroller) for any problems.
