UCD3138064ARGCR datasheet(30/83 Pages) TI1

30 / 83 page

P = FLT_STEP

P = - 1

P = 1

P = 0

A_CNT or B_CNT value

127

FLT_THRESH

TARGET_LOW

Else if A_CNT or B_CNT < FLT_THRESH

P = FLT_STEP

If in Manual Control Mode

P = Manual Control register value

Else if A_CNT or B_CNT < TARGET_LOW

P = - 1

Else if A_CNT or B_CNT > TARGET_LOW + TARGET_OFFSET

P = 1

Else

P = 0

TARGET_OFFSET

UCD3138064A

SLUSCA5A – DECEMBER 2015 – REVISED AUGUST 2016

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Detailed Description

Figure 6-7. DTC Interface Principle

Based on the DTC measured, in the next cycle:

•

A_ADJ = A_ADJ + A_

∆

•

A_ADJ = A_ADJ + B_

∆

In each cycle, the A_ADJ and B_ADJ accumulator values are dynamically adjust the dead time. The

∆

value changes after the measured body diode conduction time. A_ADJ and B_ADJ have been measured

and compared to the threshold values in automatic control mode. A_ADJ and B_ADJ can be controlled by

firmware while in manual control mode.

Other figures of this peripheral include negative current fault protection, consecutive fault counter, DTC

input multiplexor, etc. For details, refer to the programmer's manual.

6.4.4

Automatic Mode Switching

Automatic Mode switching enables the DPWM module to switch between modes automatically, with no

firmware intervention. This is useful to increase efficiency and power range. The following paragraphs

describe phase-shifted full bridge and LLC examples.

6.4.4.1

Phase Shifted Full Bridge Example

In phase shifted full bridge topologies, efficiency can be increased by using pulse width modulation, rather

than phase shift, at light load. This is shown in Figure 6-8 below:

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