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| NCP5386B单－双相处理器电源解决方案 |
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| 文章来源： 更新时间：2014/5/13 13:05:00 |
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On Semi公司的NCP5386B是单/双相降压控制器,满足Intel的VR 10.0和11.0以及AMD指标,双沿PWM和电感电流传感降低了系统成本,对瞬态负载有最快的响应,1.0V-1.6V的系统精度为0.5%,开关频率在100 kHz － 1.0 MHz, 主要用在台式计算机的处理器和芯片组,服务器处理器和芯片组和DDR电源.本文介绍了NCP5386B主要特性,框图,单相/双相应用电路,以及评估板25VT6A5VGEVB主要特性,电路图,材料清单和PCB元件布局图.
The NCP5386 is a one− or two−phase buck controller which combines differential voltage and current sensing, and adaptive voltage positioning to power both AMD and Intel processors and chipsets. Dual−edge pulse−width modulation (PWM) combined with inductor current sensing reduces system cost by providing the fastest initial response to transient load events. Dual−edge multi−phase modulation reduces total bulk and ceramic output capacitance required to satisfy transient load−line regulation.
A high performance operational error amplifier is provided, which allows easy compensation of the system. The proprietary method of Dynamic Reference Injection makes the error amplifier compensation virtually independent of the system response to VID changes, eliminating tradeoffs between overshoot and dynamic VID performance.
NCP5386B主要特性:
• Meets Intel’s VR 10.0 and 11.0, and AMD Specifications
• No load Intel VR Offset of −19 mV (NCP5386), +20 mV (NCP5386A), and 0 mV (NCP5386B)
• Dual−Edge PWM for Fastest Initial Response to Transient Loading
• High Performance Operational Error Amplifier
• Supports both VR11 and Legacy Soft−Start Modes
• Dynamic Reference Injection (Patent# 7057381)
• DAC Range from 0.5 V to 1.6 V
• _0.5% System Voltage Accuracy from 1.0 V to 1.6 V
• True Differential Remote Voltage Sensing Amplifier
• Phase−to−Phase Current Balancing
• “Lossless” Differential Inductor Current Sensing
• Differential Current Sense Amplifiers for each Phase
• Adaptive Voltage Positioning (AVP)
• Frequency Range: 100 kHz – 1.0 MHz
• OVP with Resettable, 8 Event Delayed Latch
• Threshold Sensitive Enable Pin for VTT Sensing
• Power Good Output with Internal Delays
• Programmable Soft−Start Time
• This is a Pb−Free Device*
NCP5386B应用:
• Desktop Processors and Chipsets
• Server Processors and Chipsets
• DDR
图1. NCP5386B简化框图
图2. NCP5386B两相应用电路图
图3. NCP5386B单相应用电路图
评估板25VT6A5VGEVB
The 25VT6A5VGEVB evaluation board is designed such that it can accommodate a 1x1 to a 2x2 combination of MOSFETs, for _8−FL and SO8−FL packages. Depending on the type of application and necessity, any combination of the above packages can be used. The 25VT6A5VGEVB evaluation board is designed to operate with an input voltage ranging from 8 V to 16 V, and to provide an output voltage of 0.8 V to 1.8 V for load currents of up to 25 A. The 25VT6A5VGEVB comes with a 5 V driver. The 25VT6A5VGEVB evaluation board has a number of test points that can be used to evaluate its performance in any given application.
评估板25VT6A5VGEVB主要特性:
• 8 V to 16 V Input Voltage
• 25 A of Steady State Load Current
• 500 kHz Switching Frequency
• Access to IC Features such as Enable, Switching Node and VID Settings for Output Voltage
• Convenient Test Points for Simple, Non−invasive Measurements of Converter Performance Including Input Ripple, Output Ripple, High Side and Low Side Gate Signals and Switching Node
评估板25VT6A5VGEVB应用:
• Synchronous Buck Converters
♦ High Frequency Applications
♦ High Current Applications
♦ Low Duty Cycle Applications
• Multi−phase Synchronous Buck Converters
♦ Evaluation Board has only One Phase Implemented
图4. 评估板25VT6A5VGEVB外形图
图5. 评估板25VT6A5VGEVB电路图
评估板25VT6A5VGEVB材料清单:
图6. 评估板25VT6A5VGEVB PCB元件布局图:顶层
图7. 评估板25VT6A5VGEVB PCB元件布局图:底层
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