IR IR3527多相电源节能解决方案

IR 公司的IR3527集成了IR XPhase3TM IC的双相IC驱动器,为实现多相电源解决方案提供了全特性和灵活的解决方案. IR3527具有7V/1.3A栅极驱动器,转换器输出电压高达5.1V,采用无损耗电感检测电流,正馈电压模式控制,主要用于多相服务器.本文介绍了IR3527的主要特性,方框图,PWM控制方框图以及典型应用电路.

The IR3527 Dual Phase IC combined with an IR XPhase3TM Control IC provides a full featured and flexible way to implement multiphase power solutions. The Control IC provides overall system control and interfaces with any number of IR3527 Phase ICs which each drive and monitor 2 phases of a Synchronous Buck converter.

The IR3527 implement an independent power savings function for each power stage and sequential phase timing for use in single output multiphase converters. When power saving mode is enabled, the power stage will disable its output thus eliminating its switching loss while proper converter operation is maintained by the single power stage or in conjunction with other converter power stages. The IR3527 current sense amplifiers remain active when in power savings to support adaptive voltage positioning.

IR3527主要特性:

7V/1.3A gate drivers (2.6A GATEL sink current)

Converter output voltage up to 5.1 V (Limited to VCCL-1.4V)

Loss-less inductor current sensing

Feed-forward voltage mode control

Integrated boot-strap synchronous PFET

Self-calibration of PWM ramp, current sense amplifier, and current share amplifier

Single-wire bidirectional average current sharing

Only three external components per phase, plus common decoupling capacitors

Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.

Debugging function isolates phase from the converter

Small thermally enhanced 24L 4 x 4mm MLPQ package

RoHS compliant



图1.IR3527方框图

图2.PWM方框图

图3.IR3527应用电路