Filter - Texas Instruments UCD3138 Technical Reference Manual

The UCD3138 filter is a PID filter with many enhancements for power supply control. Some of its features
include:
• PID Based Architecture
• Additional α coefficient and history in D branch
• Programmable Non-Linear Limits for automated modification of filter coefficients based on received
EADC error
• Multiple coefficient sets fully configurable by firmware
• Full 24-bit precision throughout Filter calculations
• Programmable clamps on Integrator Branch and Filter Output
• Ability to load values into internal filter registers while system is running
• Ability to stall calculations on any of the individual filter branches
• Ability to clear and stall calculations on any of the individual filter branches
• Duty Cycle, Resonant Period, or phase shift generation based on filter output.
• Flux Balancing
• Voltage feed forward
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Topic
4.1 Filter Math Details
4.2 Filter Status Register
4.3 Filter Control Register
4.4 XN, YN Read and Write Registers
4.5 Coefficient Configuration Register
4.6 Kp, Ki, and Kd Registers
4.7 Alpha Registers
4.8 Filter Nonlinear Limit Registers
4.9 Clamp Registers
4.10 Filter Preset Register
4.11 Filter Registers Reference
SNIU028A – February 2016 – Revised April 2016
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Copyright © 2016, Texas Instruments Incorporated
SNIU028A – February 2016 – Revised April 2016
Chapter 4

Filter

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