UCD3138064ARGCR datasheet(2/83 Pages) TI1

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UCD3138064A

SLUSCA5A – DECEMBER 2015 – REVISED AUGUST 2016

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Device Overview

1.2

Applications

•

Power Supplies and Telecom Rectifiers

•

Power Factor Correction

•

Isolated DC-DC Modules

1.3

Description

The UCD3138064A is a digital power supply controller from Texas Instruments offering superior levels of

integration and performance in a single-chip solution. The UCD3138064A, in comparison to Texas

Instruments UCD3138 digital power controller (Section 3), offers 64 kB of program Flash memory (vs 32

kB in UCD3138) and additional options for communication such as SPI and a second I2C port. The

availability of 64 kB of program Flash memory in 2-32 kB banks, enables the designers to implement dual

images of firmware (e.g. one main image + one back-up image) in the device and the flexibility to execute

from either of the banks using appropriate algorithms. It also creates the unique opportunity for the

processor to load a new program and subsequently execute that program without interrupting power

delivery. This feature allows the end user to add new features to the power supply in the field while

eliminating any down-time required to load the new program.

The flexible nature of the UCD3138064A makes it suitable for a wide variety of power conversion

applications. In addition, multiple peripherals inside the device have been specifically optimized to

enhance the performance of AC/DC and isolated DC/DC applications and reduce the solution component

count in the IT and network infrastructure space. The UCD3138064A is a fully programmable solution

offering customers complete control of their application, along with ample ability to differentiate their

solution. At the same time, TI is committed to simplifying our customers' development effort through

offering best in class development tools, including application firmware, Code Composer StudioTM

software development environment, and TI’s Fusion Power Development GUI which let customers

configure and monitor key system parameters.

At the core of the UCD3138064A controller are the Digital Power Peripherals (DPP). Each DPP

implements a high-speed digital control loop consisting of a dedicated Error Analog-to-Digital Converter

(EADC), a PID-based 2-pole/2-zero digital compensator and DPWM outputs with 250-ps pulse width

resolution. The device also contains a 12-bit, 267-ksps general-purpose ADC with up to 14 channels,

timers, interrupt control, PMBus, I2C, SPI and UART communications ports. The device is based on a 32-

bit ARM7TDMI-S RISC microcontroller that performs real-time monitoring, configures peripherals, and

manages communications. The ARM microcontroller executes its program out of programmable flash

memory as well as on chip RAM and ROM.

In addition to the DPP, specific power management peripherals have been added to enable high efficiency

across the entire operating range, high integration for increased power density, reliability, and lowest

overall system cost and high flexibility with support for the widest number of control schemes and

topologies. Such peripherals include: light load burst mode, synchronous rectification, automatic mode

switching, input voltage feed forward, copper trace current sense, ideal diode emulation, constant current

constant power control, synchronous rectification soft on and off, peak current mode control, flux

balancing, secondary side input voltage sensing, high-resolution current sharing, hardware-configurable

soft start with pre bias, as well as several other features. Topology support has been optimized for voltage

mode and peak current mode controlled phase shifted full bridge, single and dual phase PFC, bridgeless

PFC, hard switched full bridge and half bridge, and LLC half bridge and full bridge.

The UCD3138064A is a functional variant of the UCD3138064 Digital Power Controller that includes

significant improvements over the UCD3138064. For a description of the complete changes made in the

UCD3138064A, refer to UCD3138064A Migration Guide. The major improvements are:

The General Purpose ADC has been improved for better accuracy and performance at extreme cold

temperatures (–40°C).

The UART peripheral has been modified to include a hardware based auto-baud rate adjustment

feature.

A new Synchronous Rectifier Dead Time Optimization hardware peripheral has been added. Benefits

include:

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