UCD3138128PFCR datasheet(44/80 Pages) TI

Nome de Peças	UCD3138128PFCR

Descrição Electrónicos	UCD3138x Highly-Integrated Digital Controller For Isolated Power

PDF	80 Pages

Scroll/Zoom	100%

Fabricante Electrônico	TI [Texas Instruments]

Página de início	http://www.ti.com

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44 / 80 page

UCD3138128, UCD3138A64

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

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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:

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UCD3138128PFCR Folha de dados(PDF) 44 Page - Texas Instruments