UCD3138 datasheet(46/68 Pages) TI1

46 / 68 page

Bits [17:4]

Filter Period

KCompx

DPWMx Period

Filter YN

S0.23

14.0

S14.23

Round to

18 bits,

Clamp to

Positive

Truncate

low 4 bits

14.0

PERIOD_MULT_SEL

14.4

KCompx

DPWMx Period

Loop_VFF

Filter YN (Duty %)

Filter Duty

S0.23

14.0

S14.23

Resonant Duty 14.0

Round to

18 bits,

Clamp to

Positive

Clamp

Filter Output

Clamp High

Filter Output

Clamp Low

14.4

OUTPUT_MULT_SEL

UCD3138

SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012

www.ti.com

There is a final section for the filter, which permits its output to be matched to the DPWM:

This permits the filter output to be multiplied by a variety of correction factors to match the DPWM Period,

to provide for Voltage Feed Forward, or for other purposes. After this, there is another clamp. For resonant

mode, the filter can be used to generate both period and duty cycle.

4.14.1 Loop Multiplexer

The Loop Mux controls interconnections between the filters, front ends, and DPWMs. Any filter, front end,

and DPWM can be combined with each other in many configurations.

It also controls the following connections:

•

DPWM to Front End

•

Front End DAC control from Filters or Constant Current/Constant Power Module

•

Filter Special Coefficients and Feed Forward

•

DPWM synchronization

•

Filter to DPWM

The following control modules are configured in the Loop Mux:

•

Constant Power/Constant Current

•

Cycle Adjustment (Current and flux balancing)

•

Global Period

•

Light Load (Burst Mode)

•

Analog Peak Current Mode

Functional Overview

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