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IR公司的IRDC3477是 SupIRBuck容易使用全集成高效15A DC/DC電壓穩(wěn)壓器.輸入電壓3V-27V,輸出電壓0.5V-12V,連續(xù)提供15A的負載電流,非常低的輸出電流具有極好的效率,可編程開關頻率和軟起動,過流保護熱補償,內有精密的基準電壓(0.5V, +/‐1%),主要用在筆記本和臺式電腦,消費類電子如STB,LCD,TV和打印機等,12V和24V分布式電源,通用POL DC/DC轉換器,游戲控制臺和圖像卡.本文介紹了IR3477主要特性,功能框圖, 基本應用電路圖和IR3477演示板電路圖與材料清單,以及IR3477M 評估板特性, 評估板電路圖和IR3477M 評估板材料清單與PCB元件布局圖. The IR3477 SupIRBuckTM is an easy‐to‐use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on time hysteretic controller and MOSFETs make IR3477 a space‐efficient solution that delivers up to 15A of precisely controlled output voltage. Programmable switching frequency, soft start, and thermally compensated over current protection allows for a very flexible solution suitable for many different applications and an ideal choice for battery powered applications. Additional features include pre‐bias startup, very precise 0.5V reference, under/over voltage shutdown, thermal protection, power good output, and enable input with voltage monitoring capability. IR3477主要特性: Input Voltage Range: 3V to 27V Output Voltage Range: 0.5V to 12V Continuous 15A Load Capability Constant On‐Time Control Compensation Loop not Required Excellent Efficiency at Very Low Output Currents Programmable Switching Frequency and Soft Start Thermally Compensated Over Current Protection Power Good Output Precision Voltage Reference (0.5V, +/‐1%) Enable Input with Voltage Monitoring Capability Pre‐bias Start Up Thermal Shut Down Under/Over Voltage Fault Protection Forced Continuous Conduction Mode Option Small, Low Profile 5mm x 6mm QFN Package IR3477應用: Notebook and Desktop Computers Consumer Electronics – STB, LCD, TV, Printers 12V and 24V Distributed Power Systems General Purpose POL DC‐DC Converters Game Consoles and Graphics Cards 
圖1. IR3477方框圖
圖2. IR3477基本應用電路圖
圖3. IR3477演示板電路圖: VOUT = 1.05V, FS = 300kHz 演示板材料清單(BOM):
IR3477M 評估板 The IR3477 SupIRBuckTM is an easy-to-use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on time hysteretic controller and MOSFETs make IR3477 a space-efficient solution that delivers up to 15A of precisely controlled output voltage. IR3477 is housed in a 20-lead 5mmx6mm QFN package. Key features offered by IR3477 include: programmable switching frequency, soft start, temperature compensated over current protection, and thermal shutdown allowing a very flexible solution suitable for many different applications and an ideal choice for battery powered applications. Additional features include pre-bias startup, a very precise 0.5V reference, forced continuous conduction mode option, over/under voltage protection, power good output, and enable input with voltage monitoring capability. This user guide contains the schematic, bill of materials, and operating instructions of the IRDC3477 evaluation board. Detailed product specifications, application information and performance curves at different operating conditions are available in the IR3477 data sheet. IR3477M 評估板特性: VIN = +12V VCC = +5V VOUT = +1.05V IOUT = 0 to 15A FS = 300kHz @ CCM L = 1μH CIN = 22μF (ceramic 1210) + 68μF (electrolytic) COUT = 47μF (ceramic 0805) + 330μF (PC-CON)
圖4.IR3477M 評估板外形圖
圖5.IR3477M 評估板電路圖 IR3477M 評估板材料清單:
圖6.IR3477M 評估板元件布局圖(頂層)
圖7.IR3477M 評估板元件布局圖(底層) 詳情請見: 
ir3477m[1].pdf
(1.03 MB)
irdc3477[1].pdf
(1.53 MB)
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