UCD3138ARMHT datasheet(2/83 Pages) TI

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UCD3138A

SLUSC66B – MARCH 2015 – REVISED MAY 2015

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1.2

Applications

•

Power Supplies and Telecom Rectifiers

•

Isolated DC-DC Modules

•

Power Factor Correction

1.3

Description

The UCD3138A is a digital power supply controller from Texas Instruments offering superior levels of

integration and performance in a single-chip solution. The flexible nature of the UCD3138A 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 UCD3138A controller 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 by offering best-in-class development tools, including

application firmware, Code Composer Studio™ software development environment, and TI’s power

development GUI which lets customers configure and monitor key system parameters.

At the core of the UCD3138A controller are the digital control loop peripherals, also known as Digital

Power Peripherals (DPPs). 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, 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 UCD3138A is a functional variant of the UCD3138 Digital Power Controller that includes significant

improvements over the UCD3138. For a description of the complete changes made in the UCD3138A,

refer to UCD3138A 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:

–

Improved efficiency

–

Reduced synchronous rectifier voltage stresses

–

Shorter development cycle

A Duty Cycle Read Function has been added to improve use in peak current mode.

Device Overview

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