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| ADI ADP1043数字电源解决方案 | |||||
作者：佚名 文章来源：Internet 点击数： 更新时间：2008-4-21  |
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ADP1043 Digital Controller for Isolated Power Supply Applications The ADP1043 is a secondary side power supply controller IC that is designed to provide all the functions that are typically needed in an isolated ac/dc or dc/dc control application. The ADP1043 is optimized for minimal component count, maximum flexibility, and minimum design time. Features include remote voltage sense, local voltage sense, primary and secondary side current sense, PWM generation, and hot-swap sense and control. The control loop is digital, with an integrated programmable digital filter. Protection features include current limiting, ac sense, UVLO, and OVP (overvoltage protection). The built-in EEPROM provides extensive programming of the integrated loop filter, PWM signal timing, inrush current, soft start timing and sequencing. Reliability is improved through a built-in checksum and redundancy of critical circuits. A comprehensive GUI is provided for easy design of loop filter characteristics and programming of the safety features. The industry-standard I2C bus gives access to the many monitoring and system test functions. The ADP1043 is available in a 32-lead LFCSP package and operates from a single 3.3 V supply. The ADP1043 is a secondary side controller for switch mode power supplies (SMPS). It is designed for use in isolated redundant applications. The ADP1043 integrates the typical functions that are needed to control a power supply. These include Output voltage sense and feedback Digital loop filter compensation PWM generation Current sharing OrFET control Current, voltage, and temperature sense Housekeeping and I2C interface Calibration and trimming The main function of controlling the output voltage is performed using the feedback ADCs, the digital loop filter, and the PWM block. The feedback ADCs use a patented multipath approach. There is a combination of a high speed, low resolution (fast and coarse) ADC and a low speed, high resolution (slow and accurate) ADC. Loop compensation is implemented using the digital filter. This PID (proportional, integral, derivative) filter is implemented in the digital domain, allowing easy programming of filter characteristics, which is of great value in customizing and debugging designs. The PWM block generates up to six programmable PWM outputs for control of FET drivers and synchronous rectification FET drivers. This programmability allows many traditional and unique switching topologies to be realized. A current share bus interface is provided for parallel power supplies. The part also has hot-swap OrFET sense and control for N+1 redundant power supplies. Conventional power supply housekeeping features, such as remote and local voltage sense and primary and secondary side current sense, are included. An extensive set of protections is offered, including overvoltage protection (OVP), overcurrent protection (OCP), overtemperature protection (OTP), undervoltage protection (UVP), ground continuity monitoring, and ac sensing. All these features are programmable through the I2C bus interface. This bus interface is also used to calibrate the power supply. Other information, such as input current, output current, and fault flags, is also available through the digital bus interface. The internal 1024-byte EEPROM makes it possible to store all programmed values and allows standalone control without a microcontroller. Approximately 700 bytes of the EEPROM are available for user information, such as version and manufactu-ring date. The ADP1043 comes with a free downloadable GUI, which provides all the necessary software to program the part. The ADP1043 operates from a single 3.3 V supply and is specified from 40°C to +85°C. 主要特性： Integrates all typical controller functions Digital control loop Remote and local voltage sense Primary and secondary side current sense PWM control Synchronous rectifier control Hot-swap sense and control Current sharing Integrated programmable loop filter I2C interface Extensive fault detection and protection Extensive programming Fast calibration 8 Kb EEPROM Standalone or microcontroller control 主要应用： AC/DC power supplies Isolated dc/dc power supplies Redundant power supplies Parallel power supplies Server, storage, network, and communications infrastructure  图1. ADP1043外形图  图2. ADP1043功能方框图  图3. ADP1043典型应用电路 |
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