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UCD3138 Datasheet(PDF) 38 Page - Texas Instruments

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Part # UCD3138
Description  Highly Integrated Digital Controller for Isolated Power
PDF  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCD3138 Datasheet(HTML) 38 Page - Texas Instruments

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UCD3138
SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012
www.ti.com
All edges are dynamic in triangular mode, so fixed blanking is not that useful. The adaptive sample trigger
is not needed. It is very easy to put a fixed sample trigger exactly in the center of the FET on-time,
because the center of the on-time does not move in this mode.
4.10 Leading Edge Mode
Leading edge mode is very similar to Normal mode, reversed in time. The DPWM A falling edge is fixed,
and the rising edge moves to the left, or backwards in time, as the filter output increases. The DPWM B
falling edge stays ahead of the DPWMA rising edge by a fixed dead time. Here is a diagram of the
Leading Edge Mode:
38
Functional Overview
Copyright © 2012, Texas Instruments Incorporated
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