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UCD3138 Folha de dados(PDF) 50 Page - Texas Instruments |
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UCD3138 Folha de dados(HTML) 50 Page - Texas Instruments |
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50 / 89 page  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 50 UCD3138 SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016 www.ti.com Submit Documentation Feedback Product Folder Links: UCD3138 Detailed Description Copyright © 2012–2016, Texas Instruments Incorporated 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 (DPWMA rising edge). Blanking B could be used at the turn off time of DPWMB. The other edges are dynamic, so blanking is more difficult. Cycle Adjust B has no effect in Normal Mode. 6.6.2 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: Figure 6-18. Phase Shift |
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