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UCD3138128 Datasheet(PDF) 44 Page - Texas Instruments

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Part # UCD3138128
Description  UCD3138x Highly-Integrated Digital Controller For Isolated Power
PDF  80 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCD3138128 Datasheet(HTML) 44 Page - Texas Instruments

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UCD3138128, UCD3138A64
SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014
www.ti.com
9.4 Device Functional Modes
9.4.1 DPWM Modes Of Operation
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.
9.4.1.1 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:
44
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Product Folder Links: UCD3138128 UCD3138A64



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