尊敬的客户:为给您持续提供一对一优质服务,即日起,元器件订单实付商品金额<300元时,该笔订单按2元/SKU加收服务费,感谢您的关注与支持!
    首页产品索引NCP1207B

    NCP1207B

    购买收藏
     PWM Controller, Free Running Quasi-Resonant Current Mode

    制造商:ON

    中文数据手册

    产品信息

    The NCP1207A/B combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. For the NCP1207A, an internal 8.0 micro s timer prevents the free-run frequency to exceed 125 kHz (therefore below the 150 kHz CISPR-22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. For the NCP1207B, the internal timer duration is reduced to 4.5 micro s to allow operation at higher frequencies (up to 200 kHz).
    The Dynamic Self-Supply (DSS) drastically simplifies the transformer design in avoiding the use of an auxiliary winding to supply the NCP1207A/B. This feature is particularly useful in applications where the output voltage varies during operation (e.g. battery chargers). Due to its high-voltage technology, the IC is directly connected to the high-voltage DC rail. As a result, the short-circuit trip point is not dependent upon any VCC auxiliary level.
    The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin, also enables fast overvoltage Protection (OVP). Once an OVP has been detected, the IC permanently latches off.
    Finally, the continuous feedback signal monitoring implemented with an overcurrent fault protection circuitry (OCP) makes the final design rugged and reliable.
    • Free-Running Borderline/Critical Mode Quasi-Resonant Operation
    • Current-Mode with Adjustable Skip-Cycle capability
    • Auto-Recovery Over Current Protection
    • 500 mA Peak Current Source/Sink Capability
    • Internal 1.0 ms SoftStart
    • Internal 4.5 s Minimum TOFF
    • Latched Over Voltage Protection

    电路图、引脚图和封装图

    在线购买

    型号制造商描述购买
    NCP1207BDR2GONConverter Offline Flyback Topology Up to 200kHz 7-SOIC 立即购买

    技术资料

    标题类型大小(KB)下载
    Tips and Tricks to Build Efficient Circuits with NCP1200PDF139 点击下载
    Determining the Free-Running Frequency for QR SystemsPDF66 点击下载
    A Quasi-Resonant SPICE Model Eases Feedback Loop DesignsPDF205 点击下载
    A 30 W Power Supply Operating in A Quasi-Square Wave Resonant ModePDF246 点击下载
    Simplified freerun model for fast QR simulation (PSPICE) RAR18 点击下载
    Large signal model for AC analysis (IsSPICE)RAR235 点击下载
    Large signal model for AC analysis (PSPICE)RAR38 点击下载
    Implementing NCP1207 in QR 24 W AC-DC Converter with Synchronous RectifierPDF129 点击下载

    应用案例更多案例

    系列产品索引查看所有产品

    NC7SP17NCV8405ANCP360NCP1851
    NCS20072NOA1212NHP820MFDNCP51401
    NBSG86ANLSV8T240MUTAGNCP1055NCS20032
    NCV8402ADNCP1216ANCV78663NB3L03
    NCP336NV25320NCL30100N57M5114
    Copyright ©2012-2024 hqchip.com.All Rights Reserved 粤ICP备14022951号工商网监认证 工商网监 营业执照