UCD3138 datasheet(49/99 Pages) TI2

No. de pieza	UCD3138

Descripción Electrónicos	UCD3138 Highly Integrated Digital Controller for Isolated Power

PDF	99 Pages

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Fabricante Electrónico	TI2 [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

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UCD3138 Datasheet(PDF) 49 Page - Texas Instruments