UCD3138ARMHT datasheet(24/83 Pages) TI

24 / 83 page

2= FLT_STEP

2= - 1

2= 1

2= 0

A_CNT or B_CNT value

127

FLT_THRESH

TARGET_LOW

Else if A_CNT or B_CNT < FLT_THRESH

2= FLT_STEP

If in Manual Control Mode

2= Manual Control register value

Else if A_CNT or B_CNT < TARGET_LOW

2= - 1

Else if A_CNT or B_CNT > TARGET_LOW + TARGET_OFFSET

2= 1

Else

2= 0

TARGET_OFFSET

UCD3138A

SLUSC66B – MARCH 2015 – REVISED MAY 2015

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Figure 5-10. 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.

Specifications

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UCD3138ARMHT 数据表(PDF) 24 Page - Texas Instruments

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