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    首页产品索引NCP1251

    NCP1251

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     PWM Controller, Current Mode, for Offline Power Supplies

    制造商:ON

    中文数据手册

    产品信息

    The NCP1251 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 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 limiting the peak current.
    Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. A latched Over Voltage Protection (OVP) is combined on the same pin. For ease of implementation, an auto-recovery OVP also monitors the Vcc line. These features offer an efficient protection in case of optocoupler failure or adverse open loop operation.
    Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.


    优势特点

    • Non-dissipative internal and adjustable Over Power Protection (OPP)

    • Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions

    • Internal Ramp Compensation

    • Frequency jittering from full load to skip-cycle

    • Latch input for OVP and OTP implementations

    • Over Voltage Protection (OVP) monitoring on the Vcc pin

    • See NCP1250 for no Over Voltage Protection (OVP) on the Vcc pin


    规格参数

    ncp1251规格参数.png

    ncp1251规格参数1.png


    电路图、引脚图和封装图

    在线购买

    型号制造商描述购买
    NCP1251ASN65T1GONConverter Offline Flyback Topology 65kHz 6-TSOP 立即购买
    NCP1251ASN100T1GONIC PWM CTLR OCP AUTO 立即购买
    NCP1251CSN65T1GONConverter Offline Flyback Topology 65kHz 6-TSOP 立即购买
    NCP1251BSN65T1GON离线电源的电流型PWM控制器 立即购买
    NCP1251BSN100T1GONIC PWM CTLR OCP AUTO 立即购买
    NCP1251FSN65T1G-- 立即购买

    技术资料

    标题类型大小(KB)下载
    The NCP1250, a Versatile Tiny Controller for Offline ConvertersPDF271 点击下载
    A 60 W ac-dc Demonstrator with NCP1250PDF490 点击下载
    Loop Control Design of an ac-dc Adapter Using the NCP1250PDF357 点击下载
    OrCAD Models for NCP1250RAR105 点击下载
    ICAPS Flyback Drawing with NCP1250UNKNOW315 点击下载
    Controller, Current Mode PWM, for Offline Power SuppliesPDF261 点击下载
    A 12V/40W Demonstrator with NCP1250PDF128 点击下载
    Tips and Tricks for NCP1250PDF242 点击下载

    应用案例更多案例

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