IRIR389516ASupIRBuck同步降压稳压器解决方案.docx
IR IR3895 16A SupIRBuck 同步降压稳压器解决方案关键词：电源管理,DC/DC转换器,开关电源,IR公司的IR3895是SupIRBuck容易使用的全集成和高效率的同步降压DC/DC稳压器,包括了PWM控制器和MOSFET,输入电压5-12V,输出电压0.5V到0.86*Vin,输出电流高达16A,可编开关频率高达1.5MHz,内部数字软起动/软停止.主要用在网络设备,嵌入通信系统,服务器,存储设备和分布式POL电源架构.本文介绍了IR3895主要特性, 方框图, POL转换器应用电路图和推荐的材料清单,以及IR3895评估板主要特性,电路图,材料清单和PCB元件布局图.The IR3895 SupIRBuckTM is an easytouse, fully integrated and highly efficient DC/DC regulator. The onboard PWM controller and MOSFETs make IR3895 a spaceefficient solution, providing accurate power delivery for low output voltage applications.IR3895 is a versatile regulator which offers programmability of switching frequency and internal current limit while operates in wide input and output voltage range.The switching frequency is programmable from 300kHz to 1.5MHz for an optimum solution.It also features important protection functions, such as PreBias startup, thermally pensated current limit, over voltage protection and thermal shutdown to give required system level security in the event of fault conditions.IR3895主要特性:· Single 5V to 21V application· Wide Input Voltage Range from 1.0V to 21V with e*ternal Vcc· Output Voltage Range: 0.5V to 0.86* Vin· Enhanced Line/Load Regulation with FeedForward· Programmable Switching Frequency up to 1.5MHz· Internal Digital SoftStart/SoftStop· Enable input with Voltage Monitoring Capability· Thermally pensated Current Limit with robust hiccup mode over current protection· Smart internal LDO to improve light load and full load efficiency· E*ternal Synchronization with Smooth Clocking· Enhanced PreBias StartUp· Precision Reference Voltage (0.5V+/0.5%) with margining capability·Vp for Tracking Applications (source/sink capability ±16A)· Integrated MOSFET drivers and Bootstrap Diode· Thermal Shut Down· Programmable Power Good Output with tracking capability· Monotonic StartUp· Operating temp: 40oC < Tj < 125oC· Small Size: 5mm * 6mm PQFN· Leadfree, Halogenfree and RoHS pliantIR3895主要应用:· Net Applications· Embedded Tele Systems· Server Applications· Storage Applications· Distributed Point of Load Power Architectures图1.IR3895方框图图2.IR3895 POL转换器应用电路图:12V输入,1.2V/16A输出图2 POL转换器应用电路推荐材料清单:IR3895评估板This user guide contains the schematic and bill of materials for the IR3895 evaluation board.The guide describes operation and use of the evaluation board itself. Detailed applicationinformation for IR3895 is available in the IR3895 data sheet.IR3895评估板主要特性: Vin = +12V (+ 13.2V Ma*)Vout = +1.2V 0- 16A Fs=600kHz L= 0.4uH Cin= 5*10uF (ceramic 1206) + 1*330uF (electrolytic) Cout=6*47uF (ceramic 0805)图3.IR3895评估板外形图图4.IR3895评估板电路图IR3895评估板材料清单:图5.IR3895评估板元件布局图:顶层图6.IR3895评估板元件布局图:底层
