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    首页产品索引NCP1249

    NCP1249

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     PWM Controller Featuring Peak Power Excursion and HV Startup

    制造商:ON

    中文数据手册

    产品信息

    The NCP1249 is a highly integrated high-voltage PWM controller capable of delivering a rugged and high performance offline power supply with extremely low no-load consumption. With a supply range up to 30 V, the controller hosts a jittered 65-kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while freezing the peak current setpoint.
    To help build rugged converters, the controller features several key protective features: an internal brown-out, a non-dissipative Over Power Protection for a constant maximum output current regardless of the input voltage and two latched over voltage protection inputs - either through a dedicated pin or via the Vcc input.
    The controller architecture is arranged to authorize a transient peak power excursion when the peak current hits the limit. At this point, the switching frequency is increased from 65 kHz to 130 kHz until the peak requirement disappears. The timer duration is then modulated as the converter crosses a peak power excursion mode (long) or undergoes a short circuit (short).
    Similar to NCP1255 & NCP1254 with integrated HV Startup
    NCP1249 has Active ON (A&B) and Active OFF (C&D) versions.
    • Integrated High Voltage startup
    • 65kHz operating frequency with 130kHz Frequency Excursion
    • Internal and Adjustable Over Power Protection (OPP) Circuit
    • Adjustable Brown-Out Protection
    • Frequency Foldback down to 26 kHz and Skip-cycle in light load conditions
    • Adjustable Timer-based Auto-recovery Overload/Short-circuit protection with 100% to 25% timer reduction for short-circuit faults
    • Frequency Jittering in Normal and Frequency Foldback Modes
    • Latch Input
    • Double Vcc hiccup in fault mode

    电路图、引脚图和封装图

    在线购买

    型号制造商描述购买
    NCP1249AD65R2GONIC OFF-LINE CNTRLR PWM CM 立即购买
    NCP1249CD65R2GONICOFF-LINECTRLRPWM9SOIC 立即购买
    NCP1249BD65R2GONConverter Offline Flyback Topology 65kHz 9-SOIC 立即购买
    NCP1249DD65R2GONConverter Offline Flyback Topology 65kHz 9-SOIC 立即购买

    技术资料

    标题类型大小(KB)下载
    SOIC9 NBPDF53 点击下载
    NCP1255, a Controller with Peak Output Power CapabilityPDF338 点击下载
    Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion w/ HV StartupPDF1100 点击下载
    NCP1249A_PO.JPGUNKNOW24 点击下载
    NCP1249A_MS.JPGUNKNOW55 点击下载
    NCP1249_AD.JPGUNKNOW170 点击下载
    Conformance Report - NCP1249, NCP1339PDF345 点击下载
    IEC62368 ICX Conformance Report Certificate for NCP1249, NCP1339PDF207 点击下载

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