基于IR3521設計的AMD SVID電源技術

IR 公司的IR3521具有兩個轉換器輸出,可用于AMD處理器VDD核和VDDNB輔助平面,整個系統設定點精度為0.5%. IR3521集成xPHASE3TM 相IC,提供了整個系統控制以及任意數量的相IC 接口,并監測單相電源,從而實現了完整的AMD SVID電源解決方案.本文介紹了IR3521主要特性,方框圖,以及應用電路圖和雙輸出AMD SVID轉換器電路圖.

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:
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2 converter outputs for the AMD processor VDD core and VDDNB auxiliary planes
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Supports High Speed (HS) I2C Serial communications
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PSI_L serial commands are communicated to a programmable number of phase ICs
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0.5% overall system set point accuracy
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High speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us
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Remote sense amplifiers provide differential sensing and require less than 50uA bias current
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Programmable Dynamic VID Slew Rates
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Programmable VID Offset (VDD output only)
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Programmable output impedance (VDD output only)
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Programmable Dynamic OC for IDD_Spike
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Programmable per phase switching frequency of 250kHz to 1.5MHz
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Hiccup over current protection with delay during normal operation
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Central over voltage detection and communication to phase ICs through IIN (ISHARE) pin
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OVP disabled during dynamic VID down to prevent false triggering
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Over voltage signal to system with over voltage detection during powerup and normal operation
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Detection and protection of open remote sense lines
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Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO

Small thermally enhanced 32L MLPQ (5mm x 5mm) package

圖1.IR3521方框圖

圖2.IR3521 PWM方框圖

圖3.IR3521 應用電路圖

圖4.IR3521 輸出1系統測試點測試電路圖

圖5.IR3521 輸出2系統測試點測試電路圖

圖6.IR3521/IR3507 5相-1相雙輸出AMD SVID轉換器電路圖