基于IR3521设计的AMD SVID电源技术 - 模拟电源 -
IR 公司的IR3521具有两个转换器输出,可用于AMD处理器VDD核和VDDNB辅助平面,整个系统设定点精度为0.5%. IR3521集成xPHASE3TM 相IC,提供了整个系统控制以及任意数量的相IC 接口,并监测单相电源,从而实现了完整的AMD SVID电源解决方案.本文介绍了IR3521主要特性,方框图,以及应用电路图和双输出AMD SVID转换器电路图.
The IR3521 Control IC combined with an xPHASE3TM Phase IC provides a full featured and flexible way to implement a complete AMD SVID power solution. It provides outputs for both the VDD core and VDDNB auxiliary planes required by the CPU. The IR3521 provides overall system control and interfaces with any number of Phase ICs each driving and monitoring a single phase. The xPHASE3TM architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches.
IR3521主要特性:
2 converter outputs for the AMD processor VDD core and VDDNB auxiliary planes
Supports High Speed (HS) I2C Serial communications
PSI_L serial commands are communicated to a programmable number of phase ICs
0.5% overall system set point accuracy
High speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us
Remote sense amplifiers provide differential sensing and require less than 50uA bias current
Programmable Dynamic VID Slew Rates
Programmable VID Offset (VDD output only)
Programmable output impedance (VDD output only)
Programmable Dynamic OC for IDD_Spike
Programmable per phase switching frequency of 250kHz to 1.5MHz
Hiccup over current protection with delay during normal operation
Central over voltage detection and communication to phase ICs through IIN (ISHARE) pin
OVP disabled during dynamic VID down to prevent false triggering
Over voltage signal to system with over voltage detection during powerup and normal operation
Detection and protection of open remote sense lines
Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO
Small thermally enhanced 32L MLPQ (5mm x 5mm) package
图1.IR3521方框图
图2.IR3521 PWM方框图
图3.IR3521 应用电路图
图4.IR3521 输出1系统测试点测试电路图
图5.IR3521 输出2系统测试点测试电路图
图6.IR3521/IR3507 5相-1相双输出AMD SVID转换器电路图
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