TI UCD9220同步降压数字PWM控制方案

TI 公司的UCD9220是多轨多相同步降压数字PWM控制器,设计用于非绝缘DC/DC转换器应用. UCD9220集成了带闪存的DC/DC回路管理的专用电路以及支持配置,监视和管理的串行接口,能控制两组电压和多达4相,支持开关频率高达2MHz,逐个周期的分辨率为250ps,而闭环的分辨率达1mV,广泛应用于工业/ATE,网络设备,通信设备,服务器,存储系统以及FPGA,DSP和存储器电源.本文介绍了UCD9220的主要特性,功能方框图以及典型应用电路.

The UCD9220 is a multi-rail, multi-phase synchronous buck digital PWM controller designed for non-isolated DC/DC power applications. This device integrates dedicated circuitry for DC/DC loop management with flash memory and a serial interface to support configuration, monitoring and management.

The UCD9220 was designed to provide a wide variety of desirable features for non-isolated DC/DC converter applications while minimizing the total system component count by reducing external circuits. The solution integrates multi-loop management with sequencing, margining, tracking and intelligent phase management to optimize for total system efficiency. Additionally, loop compensation and calibration are supported without the need to add external components.

To facilitate configuring the device, the Texas Instruments Fusion Digital Power Designer is provided. This PC based Graphical User Interface offers an intuitive interface to the device. This tool allows the design engineer to configure the system operating parameters for the application, store the configuration to on-chip non-volatile memory and observe both frequency domain and time domain simulations for each of the power stage outputs.

TI has also developed multiple complementary power stage solutions - from discrete drives in the UCD7k family to fully tested power train modules in the PTD family. These solutions have been developed to complement the UCD9k family of system power controllers.

UCD9220主要特性:

Fully Configurable Multi-Output and Multi-Phase Non-Isolated DC/DC PWM Controller

Controls Up To Two Voltage Rails and Up To Four Phases

Supports Switching Frequencies Up to 2MHz With 250 ps Duty-Cycle Resolution

Up To 1mV Closed Loop Resolution

Hardware-Accelerated, 3-Pole/3-Zero Compensator With Non-Linear Gain for Improved Transient Performance

Supports Multiple Soft-Start and Soft-Stop Configurations Including Prebias Start-up

Supports Voltage Tracking, Margining and Sequencing

Supports Current and Temperature Balancing for Multi-Phase Power Stages

Supports Phase Adding/Shedding for Multi-Phase Power Stages

Sync In /Out Pins Align DPWM Clocks Between Multiple UCD9220 Devices

12-Bit Digital Monitoring of Power Supply Parameters Including:

Input Current and Voltage

Output Current and Voltage

Temperature at Each Power Stage

Multiple Levels of Overcurrent Fault Protection:

External Current Fault Inputs

Analog Comparators Monitor Current Sense Voltage

Current Digitally Monitored

Over and Undervoltage Fault Protection

Overtemperature Fault Protection

Enhanced Nonvolatile Memory With Error Correction Code (ECC)

Device Operates From a Single Supply With an Internal Regulator Controller That Allows Operation Over a Wide Supply Voltage Range

Supported by Fusion Digital Power Designer, a Full Featured PC Based Design Tool to Simulate, Configure, and Monitor Power Supply Performance.

UCD9220应用:

Industrial/ATE

Networking Equipment

Telecommunications Equipment

Servers

Storage Systems

FPGA, DSP and Memory Power



图1.UCD9220功能方框图



图2.UCD9220典型应用电路