UCD3138064ARGCR.A datasheet(25/84 Pages) TI2

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EAP0

EAN0

DAC0

EADC

4 bit dithering gives 14 bits of effective resolution

97.65625 V/LSB effective resolution

6 bit ADC

8mV/LSB

Signed 9 bit result

(error) 1 mV /LSB

AFE_GAIN

10 bit DAC

1.5625mV/LSB

Value

Dither

CPCC

Filter x

Ramp

SAR/Prebias

Absolute Value

Calculation

Averaging

10 bit result

1.5625mV/LSB

3-AFE_GAIN

Peak Current Mode

Comparator

Peak Current

Detected

AFE_GAIN

UCD3138064A

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SLUSCA5B – DECEMBER 2015 – REVISED JANUARY 2017

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Detailed Description

Figure 6-3. Front End Module

6.4.2.1.2 DPWM Module

The DPWM module represents one complete DPWM channel with 2 independent outputs, A and B.

Multiple DPWM modules within the UCD3138x system can be configured to support all key power

topologies. DPWM modules can be used as independent DPWM outputs, each controlling one power

supply output voltage rail. It can also be used as a synchronized DPWM—with user selectable phase shift

between the DPWM channels to control power supply outputs with multiphase or interleaved DPWM

configurations.

The output of the filter feeds the high resolution DPWM module. The DPWM module produces the pulse

width modulated outputs for the power stage switches. The filter calculates the necessary duty ratio as a

24-bit number in Q23 fixed point format (23 bit integer with 1 sign bit). This represents a value within the

range 0.0 to 1.0. This duty ratio value is used to generate the corresponding DPWM output ON time. The

resolution of the DPWM ON time is 250 psec.

Each DPWM module can be synchronized to another module or to an external synchronization signal. An

input SYNC signal causes a DPWM ramp timer to reset. The SYNC signal outputs—from each of the four

DPWM modules—occur when the ramp timer crosses a programmed threshold. This allows the phase of

the DPWM outputs for multiple power stages to be tightly controlled.

The DPWM logic takes the output of the filter and converts it into the correct DPWM output for several

power supply topologies. It provides for programmable dead times and cycle adjustments for current

balancing between phases. It controls the triggering of the EADC. It can synchronize to other DPWMs or

to external sources. It can provide synchronization information to other DPWMs or to external recipients.

In addition, it interfaces to several fault handling circuits. Some of the control for these fault handling

circuits is in the DPWM registers. Fault handling is covered in the Fault Mux section.

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