UCD3138ARMHT datasheet(41/83 Pages) TI

41 / 83 page

UCD3138A

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SLUSC66B – MARCH 2015 – REVISED MAY 2015

A list of the IntraMux modes for DPWMA is as follows:

0 = DPWMA(n) pass through (default)

1 = Edge-gen output, DPWMA(n)

2 = DPWNC(n)

3 = DPWMB(n) (Crossover)

4 = DPWMA(n+1)

5 = DPWMB(n+1)

6 = DPWMC(n+1)

7 = DPWMC(n+2)

8 = DPWMC(n+3)

and for DPWMB:

0 = DPWMB(n) pass through (default)

1 = Edge-gen output, DPWMB(n)

2 = DPWNC(n)

3 = DPWMA(n) (Crossover)

4 = DPWMA(n+1)

5 = DPWMB(n+1)

6 = DPWMC(n+1)

7 = DPWMC(n+2)

8 = DPWMC(n+3)

The DPWM number wraps around just like the Edge Gen unit. For DPWM3 the following definitions apply:

DPWM(n)

DPWM3

DPWM(n+1)

DPWM0

DPWM(n+2)

DPWM1

DPWM(n+3)

DPWM2

6.9

Filter

The UCD3138A filter is a PID filter with many enhancements for power supply control. Some of its

features include:

•

Traditional PID Architecture

•

Programmable non-linear limits for automated modification of filter coefficients based on received

EADC error

•

Multiple coefficient sets fully configurable by firmware

•

Full 24-bit precision throughout filter calculations

•

Programmable clamps on integrator branch and filter output

•

Ability to load values into internal filter registers while system is running

•

Ability to stall calculations on any of the individual filter branches

•

Ability to turn off calculations on any of the individual filter branches

•

Duty cycle, resonant period, or phase shift generation based on filter output.

•

Flux balancing

•

Voltage feed forward

Detailed Description

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