TI UCD9240数字PWM控制方案
TI公司的UCD9240是多输出多相同步降压数字PWM控制器,设计用于非绝缘的DC/DC电源. UCD9240集成了用于DC/DC回路管理的专用电路,闪存和串行接口,支持配置,监视和管理等功能. UCD9240的工作频率高达2MHz,占空比分辨率250ps,闭环分辨率1mV,广泛用于工业/自动测试(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UCD9240的主要特性,方框图以及典型的应用电路.TI UCD9240 Digital PWM System Controller
The UCD9240 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 configurability, monitoring and management.
The UCD9240 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.
UCD9240主要特性:
Fully Configurable Multi-Output and Multi-Phase Non-Isolated DC/DC PWM Controller
Controls Up To FourVoltage Rails and Up To Eight 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 UCD9240 Devices
Fan Monitoring and Control
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 Continually 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.
UCD9240应用:
Industrial/ATE
Networking Equipment
Telecommunications Equipment
Servers
Storage Systems
FPGA, DSP and Memory Power
图1.UCD9240方框图
图2. UCD9240典型应用电路
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