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UCD3138 bảng dữ liệu(PDF) 33 Page - Texas Instruments

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tên linh kiện UCD3138
Giải thích chi tiết về linh kiện  Highly Integrated Digital Controller for Isolated Power
PDF  68 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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UCD3138 bảng dữ liệu(HTML) 33 Page - Texas Instruments

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Phase Shift
Phase Trigger = Phase Trigger Register value or Filter Duty
DPWM0 Start of Period
Period Counter
DPWM0 Start of Period
DPWM1 Start of Period
Period Counter
DPWM1 Start of Period
UCD3138
www.ti.com
SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012
Blanking A-Begin and Blanking A-End can be used to blank out noise from the MOSFET turn on at the
beginning of the period (PWMA rising edge). Blanking B could be used at the turn off time of PWMB. The
other edges are dynamic, so blanking is more difficult.
Cycle Adjust B has no effect in Normal Mode.
4.6
Phase Shifting
In most modes, it is possible to synchronize multiple DPWM modules using the phase shift signal. The
phase shift signal has two possible sources. It can come from the Phase Shift Register. This provides a
fixed value, which is useful for an interleaved PFC, for example.
The phase shift value can also come from the filter output. In this case, the changes in the filter output
causes changes in the phase relationship of two DPWM modules. This is useful for phase shifted full
bridge topologies.
The following figure shows the mechanism of phase shift:
Copyright © 2012, Texas Instruments Incorporated
Functional Overview
33
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