ADI公司的ADP1046是用于隔离电源应用的数字控制器,它和ADP1043A引脚兼容,性能上增加了电压正馈,提高了回路响应,可编死区时间控制以最大化效率. 集成了所有典型的PWM控制器功能,有七个PWM控制信号,主要用于AC/DC转换器,冗余电源系统,服务器,存储器,网络和通信等基础设备.本文介绍了ADP1046主要特性,方框图,典型应用电路以及300W ADP1046评估板技术指标,电路图,材料清单和PCB元件布局图.
The ADP1046 is a flexible, digital secondary side controller designed for ac-to-dc and isolated dc-to-dc secondary side applications. The ADP1046 is pin-compatible with the ADP1043A and offers several enhancements and new features, including voltage feedforward, improved loop response, and programmable dead time control to maximize efficiency. The ADP1046 is optimized for minimal component count, maximum flexibility, and minimum design time. Features include local and remote voltage sense, primary and secondary side current sense, digital pulse-width modulation (PWM) generation, current sharing, and redundant OrFET control. The control loop digital filter and compensation terms are integrated and can be programmed over the I2C interface. Programmable protection features include overcurrent protection (OCP), over- voltage protection (OVP), undervoltage lockout (UVLO), and overtemperature protection (OTP). The built-in EEPROM provides extensive programming of the integrated loop filter, PWM signal timing, inrush current, and soft start timing and sequencing. Reliability is improved through a built-in checksum and programmable protection circuits. A comprehensive GUI is provided for easy design of loop filter characteristics and programming of the safety features. The industry-standard I2C bus provides access to the many monitoring and system test functions. The ADP1046 is available in a 32-lead LFCSP and operates from a single 3.3 V supply.

ADP1046主要特性:
Integrates all typical PWM controller functions
7 PWM control signals
Digital control loop
Integrated programmable loop filters
Programmable voltage line feedforward
Dedicated soft start filter
Programmable dead time for improved efficiency
Remote and local voltage sense
Primary and secondary side current sense
Synchronous rectifier control
Current sharing
OrFET control I2C interface
Extensive fault detection and protection
Extensive programming and telemetry
Fast digital calibration
User accessible EEPROM

ADP1046应用:
AC-to-DC power supplies Isolated dc-to-dc power supplies
Redundant power supply systems
Server, storage, network, and communications infrastructure

图1.ADP1046 简化框图


图2.ADP1046典型应用电路图

ADP1046评估板
This evaluation board features the ADP1046 in a switching power supply application. With the evaluation board and software, the ADP1046 can be interfaced to any PC running Windows® 2000, Windows NT, or Windows XP via the computer’s USB port. The evaluation board allows all the input and output functions of the ADP1046 to be exercised without the need for external components. The software allows control and monitor-ing of the ADP1046 internal registers. The board is set up for the ADP1046 to act as an isolated switching power supply with a rated load of 12 V/25 A from an input voltage ranging from 350 V dc to 400 V dc.

ADP1046评估板主要特性:
Interleaved 2-switch forward switching power supply
12 V/25 A regulated output from 400 V dc input
Voltage feedback loop
Dynamic phase shedding
Integrated current balance between phases
I2C serial interface to PC
Software graphic user interface (GUI)
Programmable digital filters
7 PWM outputs including auxiliary PWM (for fan control)
Digital trimming
OrFET control for hot swap and redundancy
Current, voltage, and temperature sense through GUI
Digital current sharing

图3.ADP1046评估板和子板外形图

ADP1046评估板技术指标:


图4.交错式两个开关正馈转换器拓扑图
主板电路图:

图5.ADP1046评估板主板电路图:功率级

图6.ADP1046评估板主板电路图:接口

图7.ADP1046评估板子板电路图

图8.ADP1046评估板主板元件布局图:顶层, 6.5 in × 5 in

图9.ADP1046评估板子板元件布局图:顶层,1.5 in × 1.08 in
主板材料清单:


子板材料清单:

变压器指标:


图10.变压器电路图
输出电感指标: