标签: lt3572

LT3572是一款完整的压力电机驱动解决方案，内置高效开关、双路全桥驱动器，采用固定频率，软启动功能，内部补偿和小引脚设计，使其成为压力电机的一款简单紧凑的解决方案。TinyDualFull-BridgePiezoMotorDriverOperatesfromLowInputVoltage……

压电电机具有体积小，重量轻和效率高的特点，但它需要一个精细复杂的驱动电路。LT3572通过把一个升压型稳压器和一个双通道全桥式驱动器集成在一个PFN封装之中，解决了这一问题，降低了电路板尺寸，减少了元件数目。……

Piezoelectricmotorsareusedindigitalcamerasforautofocus,zoomingandopticalimagestabilization.Theyarerelativelysmall,lightweightandefficient,buttheyalsorequireacomplicateddrivingscheme.Traditionally,thischallengehasbeenmetwiththeuseofseparatecircuits,includingastep-upconverterandanoversizedgenericfull-bridgedriveIC.Theresultinghighcomponentcountandlargeboardspaceareespeciallyproblematicinthedesignofcamerasforevershrinkingcellphones.TheLT®3572solvestheseproblemsbycombiningastep-upregulatorandadualfull-bridgedriverina4mm×4mmQFNpackage.Figure1showsatypicalLT3572Piezomotordrivecircuit.Astep-upconverterisusedtogenerate30VfromalowvoltagepowersourcesuchasaLi-Ionbatteryoranyinputpowersourcewithinthepart’swideinputvoltagerangeof2.7Vto10V.Thehighoutputvoltageofthestep-upconverter,adjustableupto40V,isavailableforthedriversattheVOUTpin.Thedriversoperateinafull-bridgefashion,wheretheOUTAandOUTBpinsarethesamepolarityasthePWMAandPWMBpins,respectively,andtheOUTAandOUTBpinsareinvertedfromPWMAandPWMB,respectively.Thestep-upconverterandbothPiezodrivershavetheirownshutdowncontrol.Figure2showsatypicallayout.TinyDualFull-BridgePiezoMotorDriverOperatesfromLowInputVoltage……