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Every process control application will need power. So when designing the power chain, it is best to start from the source and work to the point of load. Understand the input voltages to the system. Is it isolated? Does it need a standard AC/DC brick with something like 12V out? In industrial control, there are a lot of areas where one will need to isolate the power supply either for safety or noise. Renesas' ISL684x family is a good family for this requirement. Once the designer starts going to the point of load there are a number of different considerations that need to be looked at. Simply understanding the input voltage, output current and output voltage is a great start. For a guide, currents above 5A will generally need a switching controller, currents above 500mA will need a switching regulator, and currents below 1A will generally look to LDOs if reduced noise or simplicity is needed. Once the rails have been determined, then an understanding of any sequencing or monitoring needs will be very useful in determining the right products for the application. Renesas has a very strong isolation portfolio, with some very interesting integrated FET products and high current LDOs.
