原标题：TI UCD3138可编数字电源控制器参考设计

　　TI公司的UCD3138是可编数字电源控制器, 在单一芯片解决方案内提供高集成度和出色性能.控制器的内核是数字控制环路外设，也被称为数字电源外设(DPP)。每个DPP 执行一个高速数字控制环路，此环路由一个专用误差模数转换器(EADC),一个基于2 极- 2 零数字补偿器的PID 和具有250ps 脉宽分辨率的DPWM 输出组成。其灵活的特性使得此器件适合于品种繁多的电源转换应用如军用雷达,电信DC/DC模块,服务器AC/DC电源等.本文介绍了UCD3138主要特性,框图,应用电路,以及评估板UCD3138A64OEVM-662 EVM主要特性,测试连接图,电路图,材料清单和PCB元件布局图.

　　The UCD3138 family is a digital power supply controller from Texas Instruments offering superior levels of integration and performance in a single chip solution. The UCD3138x, in comparison to Texas Instruments UCD3138x digital power controller offers 64 kB of program Flash memory in UCD3138A64 (128 KB in UCD3138128) and additional options for communication such as SPI and a second I2C port. The availability of of program Flash memory in multiple 32 kB banks enables designers to implement dual images of firmware (e.g. one main image + one back-up image) in the device and provides the option 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 UCD3138 family 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 family 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 StudioTM software development environment, and TI’s Fusion Power Development GUI which enables customers to configure and monitor key system parameters.

　　At the core of the 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 250ps pulse width resolution. The device also contains a 12-bit, 267 ksps general purpose ADC with up to 15 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, 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, active clamp forward converter, two switch forward converter and LLC half bridge and full bridge.

　　UCD3138主要特性:

　　64 kB and 128 kB Program Flash Derivative of UCD3138 Family

　　2-32 kB or 4-32 kB Program Flash Memory Banks

　　Supports Execution From 1 Bank, While Programming Another

　　Capability to Update Firmware Without Shutting Down the Power Supply

　　Additional Communication Ports Compared to the UCD3138 (+1 SPI, +1 I2C)

　　Boot Flash Based Dual Memory Image Support for ‘On the Fly’ Firmware Updates

　　Digital Control of up to 3 Independent Feedback Loops

　　Dedicated PID Based Hardware

　　2-pole/2-zero Configurable, Non-Linear Control

　　Up to 16 MSPS Error A/D Converter (EADC)

　　Configurable Resolution (min: 1mV/LSB)

　　Up to 8x Oversampling and Adaptive Sample Positioning

　　Hardware Based Averaging (up to 8x)

　　14 bit Effective Reference DAC

　　Up to 8 High Resolution Digital Pulse Width Modulated (DPWM) Outputs

　　250 ps Pulse Width Resolution

　　4 ns Frequency and Phase Resolution

　　Adjustable Phase Shift and Dead-bands

　　Cycle-by-Cycle Duty Cycle Matching

　　Up to 2 MHz Switching Frequency

　　Configurable Trailing/Leading/Triangular Modulation

　　RTC support

　　Configurable Feedback Control

　　Voltage, Average Current and Peak Current Mode Control

　　Constant Current, Constant Power

　　Configurable FM, Phase Shift Modulation and PWM

　　Fast, Automatic and Smooth Mode Switching

　　Frequency Modulation and PWM

　　Phase Shift Modulation and PWM

　　High Efficiency and Light Load Management

　　Burst Mode & Ideal Diode Emulation

　　Synchronous Rectifier Soft On/Off

　　Low IC Standby Power

　　Primary Side Voltage Sensing

　　Current Share (Average & Master/Slave)

　　Feature Rich Fault Protection Options

　　7 Analog / 4 Digital Comparators,

　　Cycle-by-Cycle Current Limiting

　　Programmable Blanking Time and Fault Counting

　　External Fault Inputs

　　Synchronization of DPWM Waveforms Between Multiple UCD3138x Devices

　　15 channel, 12 bit, 267 ksps General Purpose ADC

　　Internal Temperature Sensor

　　Fully Programmable High-Performance 31.25 MHz, 32-bit ARM7TDMI-S Processor

　　64 kB Program Flash (2-32 kB Banks)

　　2 kB Data Flash with ECC

　　8 kB Data RAM

　　4 kB Boot ROM Enables Firmware Boot-Load

　　Communication Peripherals,

　　2 - I2C/PMBus interfaces

　　2 - UARTs, 1 - SPI

　　Timer Capture with Selectable Input Pins

　　80-pin QFP Package

　　Operating Temperature: –40°C to 125°C

　　UCD3138应用:

　　Power Supplies and Telecom Rectifiers

　　Power Factor Correction

　　Isolated DC-DC Modules

　　Phase Shifted Full Bridge with Peak Current Mode Control, LLC, HSFB, Forward, etc.

　　图1. UCD3138框图

　　图2. UCD3138 DC/DC转换器电路图

　　UCD3138A64评估板UCD3138A64OEVM-662 EVM

　　CD3138A64 Programmable Digital Power Controller Open Loop Evaluation Module

　　The UCD3138A64OEVM-662 EVM offers an easy to use test platform for stand-alone evaluation of UCD3138A64 digital controller optimized for isolated power applications. Featuring an 80-pin socket and a comprehensive set of test points, the EVM allows hardware and firmware engineers to manipulate signals on the different pins of the device individually and study open loop operation. The EVM also offers the flexibility to realize simple closed loop control configurations (eg. using RC circuits to filter PWM output signals and regulate a DC voltage in closed loop control).

　　Hardware ports available to communicate with the device include PMBus and UART. The EVM accepts up to 5V DC input and an on-board 3.3V LDO can be used to bias the device. Alternately, using jumpers, the device can be biased using the PMBus communication pins.

　　评估板UCD3138A64OEVM-662 EVM主要特性:

　　Test points for easy access to all pins of UCD3138A64 80-pin digital controller

　　Socket for easy removal/replacement of the device

　　All GPIO and ADC12 pins accessible (with on-board RC filters on each pin)

　　Capability to adapt EVM for various evaluation targets using jumpers

　　Hardware terminals: PMBus, UART, and Logic Analyzer

　　Includes On-board SPI and I2C accessible EEPROMs for additional memory storage

　　External 5.0V supply input with onboard 3.3V LDO to bias the device (option to bias device using PMBus ports)

　　图3. 评估板UCD3138A64OEVM-662 EVM外形图

　　评估板UCD3138A64OEVM-662 EVM包括:

　　 UCD3138A64 function evaluation

　　 Firmware debug

　　 Hardware design assistance

　　图4. 评估板UCD3138A64OEVM-662 EVM测试连接图

　　评估板UCD3138A64OEVM-662 EVM材料清单: