UCD3138 datasheet(48/89 Pages) TI1

部品番号	UCD3138

部品情報	Highly Integrated Digital Controller for Isolated Power

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UCD3138

SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016

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Detailed Description

6.6

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.

6.6.1

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:

UCD3138 データシート(PDF) 48 Page - Texas Instruments