UCD3138 datasheet(61/89 Pages) TI1

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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

UCD3138

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SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016

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Application and Implementation

These signals are actually routed to pins DPWM3A and 3B using the Intra Mux with these statements:

Dpwm3Regs.DPWMCTRL0.bit.PWM_A_INTRA_MUX = 7; // Send DPWM1C

Dpwm3Regs.DPWMCTRL0.bit.PWM_B_INTRA_MUX = 8; // Send DPWM2C

Since these signals are really being used as events in the timer, the #defines are called EV5 and EV6.

Here are the statements which initialize them:

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

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

Dpwm2Regs.DPWMBLKBEND.all = PWM2_EV6;

Figure 7-5. Blank B Timing Information

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

timing information.

7.2.2.5

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

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