UCD3138128 datasheet(51/80 Pages) TI

Part #	UCD3138128

Description	UCD3138x Highly-Integrated Digital Controller For Isolated Power

PDF	80 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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51 / 80 page

UCD3138128, UCD3138A64

www.ti.com

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

Device Functional Modes (continued)

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.

9.4.3 Leading Edge Mode

Leading edge mode is 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:

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UCD3138128 Datasheet(PDF) 51 Page - Texas Instruments