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UCD3138 bảng dữ liệu(PDF) 49 Page - Texas Instruments

tên linh kiện UCD3138
Giải thích chi tiết về linh kiện  UCD3138 Highly Integrated Digital Controller for Isolated Power
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UCD3138 bảng dữ liệu(HTML) 49 Page - Texas Instruments

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9.6 Device Functional Modes
The DPWM is a complex logic system which is highly configurable to support several different power supply
topologies. The discussion below will focus primarily on waveforms, timing and register settings, rather than on
logic design.
The DPWM is centered on a period counter, which counts up from 0 to PRD, and then is reset and starts over
again.
The DPWM logic causes transitions in many digital signals when the period counter hits the target value for that
signal.
9.6.1 Normal Mode
In Normal mode, the Filter output determines the pulse width on DPWM A. DPWM B fits into the rest of the
switching period, with a dead time separating it from the DPWM A on-time. It is useful for buck topologies,
among others. Here is a drawing of the Normal Mode waveforms:
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UCD3138
SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021
Copyright © 2021 Texas Instruments Incorporated
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