UCD3138 datasheet(62/99 Pages) TI2

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// Setup waveform for DPWM-C (re-using blanking B regs)

Dpwm2Regs.DPWMBLKBBEG.all = PWM2_EV5 + (4 *16);

Dpwm2Regs.DPWMBLKBEND.all = PWM2_EV6;

3 A – QB1

( DPWM1 C)

3 B – QT1

( DPWM 2 C)

Controlled by DPWM1 Blanking register

Blank B Begin

Blank B End

Period Start

Period End

Even 5

Even 6

Even 5

Even 6

Controlled by DPWM2 Blanking register

Blank B Begin

Blank B End

Figure 10-5. Blank B Timing Information

The statements for DPWM1 are the same. Remember that DPWMC reuses the Blank B registers for timing

information.

10.2.2.5 Dynamic Signals to Bridge

DPWM0 and 1 are set at normal mode. PCMC triggering signal (fault) chops DPWM0A and 1A cycle by cycle.

The corresponding DPWM0B and 1B are used for synchronous rectifier MOSFET control. The same PCMC

triggering signal is applied to DPWM2 and DPWM3. Both of these are set to normal mode as well. DPWM2

and 3 are chopped and their edges are used to generate the next two dynamic signals to the bridge. They

are generated using the Edge Generator Module in DPWM2. The Edge Generator sources are DPWM2 and

DPWM3. The edges used are:

DPWM2A turned on by a rising edge on DPWM2BF

DPWM2A turned off by a falling edge on DPWM3AF

DPWM2B turned on by a rising edge on DPWM3BF

DPWM2B turned off by a falling edge on DPWM2AF

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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