UCD3138ARMHT datasheet(40/83 Pages) TI

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A ON SELECT

A OFF SELECT

B ON SELECT

B OFF SELECT

EGEN A

EGEN B

EDGE GEN

PWM A

PWM B

B SELECT

A SELECT

INTRAMUX

A/B/C (N)

A/B/C (N+1)

C (N+2)

C (N+3)

A(N)

B(N)

A(N+1)

B(N+1)

UCD3138A

SLUSC66B – MARCH 2015 – REVISED MAY 2015

www.ti.com

6.8

DPWMC, Edge Generation, IntraMux

The UCD3138A has hardware for generating complex waveforms beyond the simple DPWMA and

DPWMB waveforms already discussed – DPWMC, the Edge Generation Module, and the IntraMux.

DPWMC is an auxillary signal inside the DPWM logic. It can be generated using the Blanking A begin

time, and the Blanking A end time.

The Edge Gen module takes DPWMA and DPWMB from its own DPWM module, and the next one, and

uses them to generate edges for two outputs. For DPWM3, the DPWM0 is considered to be the next

DPWM. Each edge (rising and falling for DPWMA and DPWMB) has 8 options which can output a

generated edge.

The options are:

0 = DPWM(n) A Rising edge

1 = DPWM(n) A Falling edge

2 = DPWM(n) B Rising edge

3 = DPWM(n) B Falling edge

4 = DPWM(n+1) A Rising edge

5 = DPWM(n+1) A Falling edge

6 = DPWM(n+1) B Rising edge

7 = DPWM(n+1) B Falling edge

Where “n" is the numerical index of the DPWM module of interest. For example n=1 refers to DPWM1.

The Edge Gen is controlled by the DPWMEDGEGEN register.

The IntraMux (short for intra multiplexer) is controlled by the Auto Config registers. The IntraMux takes

signals from multiple DPWMs and from the Edge Gen and combines them logically to generate DPWMA

and DPWMB signals This is useful for topologies like phase-shifted full bridge, especially when they are

controlled with automatic mode switching. Of course, it can all be disabled, and DPWMA and DPWMB will

be driven as described in the sections above. If the Intra Mux is enabled, high resolution must be disabled,

and DPWM edge resolution goes down to 4 ns.

The Edge Gen/Intra Mux is shown in Figure 6-10.

Figure 6-10. Edge Gen/Intra Mux

Detailed Description

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