UCD3138ARMHT datasheet(25/87 Pages) TI1

25 / 87 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

SR0_ DPWM

SR1_ DPWM

DTC0

DTC1

DETECT_ BLANK

DETECT_ LEN

DETECT

ADJUST

UCD3138A

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SLUSC66C – MARCH 2015 – REVISED SEPTEMBER 2016

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Specifications

DTC0 and DTC1 are received body diode conduction inputs from UCD7138. SR0_DPWM and

SR1_DPWM are the DPWM waveforms for the SRs. The red and green edges are moving edges

controlled by both the filter output and the DTC interface. In each cycle, right after the falling edge of the

SR DPWM waveform, a body diode conduction time detection window is generated. The detection window

is defined by both DETECT_BLANK and DETECT_LEN registers. During this detection window, a 4-ns

timer capture counts how long the body diode conducts. Then the DPWM turn off edge of the next cycle is

adjusted accordingly.

Figure 5-7. Timing Diagram of the DTC Interface

Figure 5-8 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 5-8. DTC Interface Principle

Based on the DTC measured, in the next cycle:

•

A_ADJ = A_ADJ + A_

∆

•

A_ADJ = A_ADJ + B_

∆

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