3.9. Cyclone® 10 LP EPE - Enpirion Worksheet
Each row in the Regulator Selection table represents the power solution for a single power group. The power groups are created by combining rails that can be allowably supplied from the same source. Enpirion device selection is enabled when the Main worksheet for the Maximum Power Characteristics and the Regulator Group section of the Report worksheet are set up correctly with no grouping errors.
In the following figure, a 12-V off-line regulator supplies input power for Groups 1 and 5. The 3-V regulator supplying Group 5 also acts as an intermediate bus supplying input power for Groups 2, 3, and 4.
|Group||Compatible rails are combined in order to minimize the number of regulators required. For additional information, refer to the Report worksheet. See also Grouping Errors on the Main worksheet.|
|Regulator Input Voltage (V)||Enter the input voltage here. The output voltage will be derived from this voltage. This field is filled automatically when non-zero Parent Group is specified.|
|Load Current Margin||Margin can be added to account for component variability. It is recommended to retain the default 30% to assure the thermal capability of the solution over the full range of device variation and operating conditions. However, in certain cases when characteristics and conditions are fully defined, reducing the margin may lead to a more cost-effective solution. Exercise caution when changing these values.|
|Parent Group||If one of the group voltages is to be used as an intermediate bus voltage, enter the group number here.|
|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. If desired, select Linear in the row for Group 2.|
|POK||Select Yes to select a regulator with a Power OK (POK) output to assist with sequencing.|
|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.|
|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.|
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