UCD3138128 datasheet(61/80 Pages) TI

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3 A – QB1

( DPWM1C )

3 B – QT1

( DPWM2 C)

2 B – QB2

( EDGEGEN )

2 A – QT 2

( EDGEGEN)

0 B –

QSYN 2,4

1 B –

QSYN 1 ,3

Transformer

Voltage

X1 , X2 , X 3 and Y1 , Y2 , Y 3

are sets of moving edges

All other edges are fixed .

DPWM 2 AF

DPWM 2 BF

DPWM3 AF

DPWM3 BF

Current

Peak Level

UCD3138128, UCD3138A64

www.ti.com

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

Here is an overview of the key PSFB signals:

Figure 39. Key PSFB Signals

10.2.2.3 DPWM Synchronization

DPWM1 is synchronized to DPWM0, DPWM2 is synchronized to DPWM1, and DPWM3 is synchronized to

DPWM2, ½ period out of phase using these commands:

Dpwm1Regs.DPWMCTRL0.bit.MSYNC_SLAVE_EN = 1; //configured to slave

Dpwm2Regs.DPWMCTRL0.bit.MSYNC_SLAVE_EN = 1; // configured to slave

Dpwm3Regs.DPWMCTRL0.bit.MSYNC_SLAVE_EN = 1; // configured to slave

Dpwm0Regs.DPWMPHASETRIG.all = PWM_SLAVESYNC;

Dpwm1Regs.DPWMPHASETRIG.all = PWM_SLAVESYNC;

Dpwm2Regs.DPWMPHASETRIG.all = PWM_SLAVESYNC;

LoopMuxRegs.DPWMMUX.bit.DPWM1_SYNC_SEL = 0; // Slave to dpwm-0

LoopMuxRegs.DPWMMUX.bit.DPWM2_SYNC_SEL = 1; // Slave to dpwm-1

LoopMuxRegs.DPWMMUX.bit.DPWM3_SYNC_SEL = 2; // Slave to dpwm-2

If the event registers on the DPWMs are the same, the two pairs of signals will be symmetrical. All code

examples are taken from the PSFB EVM code, unless otherwise stated.

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