4.13. Arria® 10 EPE - Enpirion Worksheet
Enpirion power devices are available that satisfy the power requirements for the power rails on Intel FPGA devices. Power devices are selected based on load current, input and output voltages, and power-delivery configuration.
Regulator groups are created by combining rails that can be allowably supplied from the same source. Enpirion device selection is enabled when Power Characteristics in the Main worksheet is set to Maximum, and the Regulator Group section of the Report worksheet is set up correctly with no grouping errors.
In the following figure, a 12-V off-line regulator supplies input power for Groups 5 and 6. The regulator for Group 6 is an intermediate supply, which does not directly power any of the FPGA supplies, but provides input power to regulators for Groups 2, 3, and 4. The 3-V regulator supplying Group 5 provides power for FPGA supplies, but also acts as an intermediate supply providing input power for Group 1.
|Group||The regulator group number for this regulator. The regulator group numbers correspond to the group numbers shown in the Report worksheet.|
|Intermediate Supply||Indicate whether the supply is an intermediate supply. An intermediate supply is driven by a regulator that is not connected to any supply rails on the FPGA. Instead, such a regulator drives other regulators. If a regulator provides power to both the FPGA and other regulators, this field should be set to No.|
|Regulator Input Voltage (V)||Specifies the input voltage for the regulator. This field is filled automatically if you specify a non-zero Parent Group.|
|Regulator Current Draw (A)||Specifies the required input current to the regulator. It is assumed that all regulators have a current efficiency of 85%.|
|Voltage (V)||Specifies the output voltage for the regulator.|
|Load Current (A)||Specifies the load current required by the pins from the regulator.|
|Load Current Margin||Margin added to the load current to account for component variability. Recommended rail-specific margin values can be found in the Report worksheet in the Recommended Margin column.|
|Parent Group||Specifies the group number of the regulator that supplies input voltage to the regulator in the current row. This value is applicable only when the input voltage is provided by another regulator on this worksheet.|
|Regulator Type||In some cases, a linear regulator (LDO) may be a good choice to supply one of the group voltages. The efficiency of an LDO is the ratio of output voltage to input voltage. In the figure, Group 2 can be efficiently supplied by an LDO.|
|POK||Select Yes to select a regulator with a Power OK (POK) output to assist with sequencing.|
|Note||A note may be displayed here, depending on the chosen value under Suggested Enpirion Part.|
|Suggested Enpirion Part||Suggested Enpirion part is automatically populated with the part number of the device that most closely matches the Load Current (A), Regulator Type and POK selections. The dropdown can be used to optionally select devices with equivalent or higher current capabilities.
To finalize regulator selection, evaluate the VRM voltage ripple specification and efficiency against the FPGA device requirement from the appropriate datasheets.
To enable this field, you must set the Power Characteristics setting in the Main worksheet to Maximum.
|Pin Compatible Parts||Pin compatible parts are devices with equivalent or higher current capabilities that can be placed on the same PCB footprint as the Suggested Enpirion Part. Additional components or changes to component values may be required when using a pin compatible part. To enable this field, you must set the Power Characteristics setting in the Main worksheet to Maximum.|
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