Datasheet

UCD3138

www.ti.com

SLUSAP2F –MARCH 2012–REVISED NOVEMBER 2013

1.2 Applications

• Power Supplies and Telecom Rectifiers

• Power Factor Correction

• Isolated dc-dc Modules

2 Overview

2.1 Description

The UCD3138 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 UCD3138 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 UCD3138 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

customer’s development effort through offering best in class development tools, including application

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

which enables customers to configure and monitor key system parameters.

At the core of the UCD3138 controller are the digital control loop peripherals, also known as 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, 267ksps 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 FDPP, 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, LLC and phase

shifted full bridge 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.

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