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AN2559 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2559 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 35 page  September 2007 Rev 1 1/35 AN2559 Application note System power supply board for digital solutions Introduction This document describes a power supply reference board designed for powering digital applications, such as CPUs, FPGAs, memories, etc. The main purpose of the board is to illustrate the basic principles used for the design of the power supply and to give designers a usable prototype for testing and use. The trend in recent years in the supplying of power to MCUs, CPUs, memories, FPGAs, etc. is to reduce the supply voltage, increase the supply current and provide different voltage levels for different devices in one platform. A typical example of this situation is the FPGA. The FPGA contains a core part which works at a low level voltage, the interface part placed between the core and the output, the system part, etc. It is important to note that each FPGA family has a slightly different voltage level and the trend is to decrease the voltage for each new family. The lowest operating voltage currently available is 1 V, and this can be expected to decrease to 0.9 V or 0.8 V in the near future. A similar situation exists with other digital applications. Typically, the main CPU, memory and interfaces require different supply voltage levels. Low operating voltages also present another challenge - transient. Digital devices are typically sensitive to voltage level. If the voltage drops below or crosses over a specific limit, the device is reset. This limit is typically ± 3 or ± 5%. On the other hand, digital device consumption can change very quickly (several amps in a few hundred nanoseconds). A power supply must be able to react very quickly with a minimum of over (or under) voltage, especially in cases where very low output voltage is required. There is additional stress placed on power supplies for digital applications in the industrial environment. The industrial standard bus is 24 V, but this voltage fluctuates and the maximum input voltage level required can reach 36 V. Additional surge protection is also a mandatory part of power supply input for industrial applications. The goal of the board described in this application note is to cover all of the issues outlined above. It is intended mainly to satisfy industrial input requirements (operating voltages up to 36 V) and generate several output voltages for mid-range power applications (up to several amps). The main output voltage level can simply be set. www.st.com |
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