Today's mid- to high-end programmable logic controller (PLC) solutions implement powerful FPGAs or SoCs to enable state-of-the-art industrial automation equipment. Therefore, to fulfill the required power sequencing of such demanding components, a flexible setup based on a general-purpose RL78/G12 microcontroller and six discrete DC/DC regulators (with integrated power MOSFETs) enable an ultimate scalable power sequencing solution for a broad range of FPGA and SoC applications, while maintaining ease of use and low risk of failures during implementation.
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This is a Flexible 6-Channels power sequencer for a PLCs PoC Board. The design allows the board users to perform two main functionalities: a power-up sequence, and a power-down sequence using the GUI targeted for their specific application. The delays between regulators (enable and disable) are individually programmable via the GUI. The delays for the Power OFF Sequence are limited by the maximum time that the input capacitors can buffer and are heavily dependent on the load of each regulator. If longer delays are required for the Power OFF Sequence, an additional electrolytic capacitor is required.