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IR公司的IR3895是SupIRBuck容易使用的全集成和高效率的同步降壓DC/DC穩壓器,包括了PWM控制器和MOSFET,輸入電壓5-12V,輸出電壓0.5V到0.86xVin,輸出電流高達16A,可編開關頻率高達1.5MHz,內部數字軟起動/軟停止.主要用在網絡設備,嵌入通信系統,服務器,存儲設備和分布式POL電源架構.本文介紹了IR3895主要特性, 方框圖, POL轉換器應用電路圖和推薦的材料清單,以及IR3895評估板主要特性,電路圖,材料清單和PCB元件布局圖. The IR3895 SupIRBuckTM is an easy‐to‐use, fully integrated and highly efficient DC/DC regulator. The onboard PWM controller and MOSFETs make IR3895 a space‐efficient 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 Pre‐Bias startup, thermally compensated 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 external Vcc Output Voltage Range: 0.5V to 0.86* Vin Enhanced Line/Load Regulation with Feed‐Forward Programmable Switching Frequency up to 1.5MHz Internal Digital Soft‐Start/Soft‐Stop Enable input with Voltage Monitoring Capability Thermally Compensated Current Limit with robust hiccup mode over current protection Smart internal LDO to improve light load and full load efficiency External Synchronization with Smooth Clocking Enhanced Pre‐Bias Start‐Up 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 Start‐Up Operating temp: ‐40oC < Tj < 125oC Small Size: 5mm x 6mm PQFN Lead‐free, Halogen‐free and RoHS Compliant IR3895主要應用: Netcom Applications Embedded Telecom Systems Server Applications Storage Applications Distributed Point of Load Power Architectures 
圖1.IR3895方框圖
圖2.IR3895 POL轉換器應用電路圖:12V輸入,1.2V/16A輸出 圖2 POL轉換器應用電路推薦材料清單:
IR3895評估板 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 application information for IR3895 is available in the IR3895 data sheet. IR3895評估板主要特性: • Vin = +12V (+ 13.2V Max) •Vout = +1.2V @ 0- 16A • Fs=600kHz • L= 0.4uH • Cin= 5x10uF (ceramic 1206) + 1X330uF (electrolytic) • Cout=6x47uF (ceramic 0805)
圖3.IR3895評估板外形圖
圖4.IR3895評估板電路圖 IR3895評估板材料清單:
圖5.IR3895評估板元件布局圖:頂層
圖6.IR3895評估板元件布局圖:底層 詳情請見: 
ir3895m.pdf
(2.7 MB)
和
irdc3895.pdf
(4.61 MB)
來源：網絡 |
