UCD3138128APFCR datasheet(31/83 Pages) TI1

31 / 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

UCD3138128A

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Figure 16 shows how the turn off edge is adjusted based on the DTC measurement of the previous cycle. The

A_ADJ and B_ADJ registers in DTCMONITOR are signed accumulators; default value is 0.

Figure 16. 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.

9.3.3 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.

9.3.3.1 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 below:

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