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UCD3138 bảng dữ liệu(PDF) 42 Page - Texas Instruments

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tên linh kiện UCD3138
Giải thích chi tiết về linh kiện  Highly Integrated Digital Controller for Isolated Power
PDF  68 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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UCD3138 bảng dữ liệu(HTML) 42 Page - Texas Instruments

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Filter Duty
Low – Lower Threshold
High – Lower Threshold
Control
Register 1
Auto Config High
Auto Config Mid
High – Upper Threshold
Low – Upper Threshold
0
Full Range
Automatic Mode Switching
With Hysteresis
UCD3138
SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012
www.ti.com
4.12.3 Mechanism for Automatic Mode Switching
Many of the configuration parameters for the DPWM are in DPWM Control Register 1. For automatic
mode switching, some of these parameters are duplicated in the Auto Config Mid and Auto Config High
registers.
If automatic mode switching is enabled, the filter duty signal is used to select which of these three
registers is used. There are 4 registers which are used to select the points at which the mode switching
takes place. They are used as shown below.
As shown, the registers are used in pairs for hysteresis. The transition from Control Register 1 to Auto
Config Mid only takes place when the Filter Duty goes above the Low Upper threshold. It does not go
back to Auto Config Mid until the Low Lower Threshold is passed. This prevents oscillation between
modes if the filter duty is close to a mode switching point.
42
Functional Overview
Copyright © 2012, Texas Instruments Incorporated
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