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    首页产品索引NCP1351

    NCP1351

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     Controller, Variable Off-Time Current Mode, with Short Circuit Protection

    制造商:ON

    中文数据手册

    产品信息

    The NCP1351 is a current mode controller targeting low power off line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.
    An externally adjustable timer permanently monitors the feedback activity and protects the supply in presence of a short circuit or an overload. Once the timer elapses, NCP1351 stops switching and stays latched for version A, and tries to restart for Version B.
    The internal structure features an optimized arrangement which allows one of the lowest available startup current, a fundamental parameter when designing low standby power supplies. The negative current sensing technique minimizes the impact of the switching noise on the controller operation and offers the user to select the maximum peak voltage across his current sense resistor. Its power dissipation can thus be application optimized.
    Finally, the bulk input ripple ensures a natural frequency smearing which smooths the EMI signature.
    • Quasi fixed TON, Variable TOFF Current Mode Control
    • Frequency foldback with Peak Current Compression
    • Short circuit protection (latchedA version or auto restart B version)
    • Primary or secondary side regulation
    • Dedicated Latch Input for OTP, OVP
    • Low start-up current
    • Natural frequency jittering
    • Negative current sensing with programmable current sense resistor

    电路图、引脚图和封装图

    在线购买

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    技术资料

    标题类型大小(KB)下载
    NCP1351 Evaluation Board, 19 V - 3 A AdaptorPDF260 点击下载
    Variable Off Time PWM ControllerPDF526 点击下载
    NCP1351 Modeling Using the PWM Switch TechniquePDF184 点击下载
    NCP1351 Evaluation Board Printer Power SupplyPDF549 点击下载
    NCP1351 Evaluation Board, a 12 V / 2 A Full DCMPDF328 点击下载
    NCP1351: Universal Input, 20 W, LED BallastPDF389 点击下载
    Stability Analysis in Multiple Loop SystemsPDF213 点击下载
    SOIC-8 Narrow BodyPDF61 点击下载

    应用案例更多案例

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