Closed Loop Power Supply Trimming

Enhanced closed-Loop trim expands the on-chip hardware trim engine by providing the ability to set trim targets in real-time through either an I²C or SPI serial interface, as well as the new feature of being able to select individual channels for trimming operations. In addition, this reference design provides the option of supporting up to two VID trim channels, where up to 16 distinct trim targets per supply can be dynamically selected through a 4-bit binary code.

Features

• Monitor and control different power supplies using Platform Manager trim cell outputs
• Improve supply precision to <1.0% output error
• Set to pre-determined output levels for test or to control device supply voltage modes

1. While this design reads VMON voltages, it does not prevent the VMON inputs from being used by the CPLD logic.
 

download design documentation (RD1078)

download source code

* May work in other devices as well.

Note: The performance and design sizes shown above are estimates only. The actual results may vary depending upon the chosen parameters, timing constraints, and device implementation. See the design's documentation for details. All coding and design work was done on a PC platform unless noted otherwise.