NCP1239B65WGEVB 是一款 65 W、19V、固定频率电流模式控制器评估板，具有动态自供电功能。此功能通过激活内部启动电流源在启动、瞬态、锁存、待机等期间为控制器供电，大大简化了辅助电源和 Vcc 电容器的设计。控制器的电源范围高达 35 V，拥有一个抖动的 65 或 100 kHz 开关电路，以峰值电流模式控制运行。当次级侧的功率开始下降时，控制器会自动将其开关频率折回至 26 kHz 的最低水平。随着功率进一步下降，该部件进入跳跃周期，同时限制峰值电流，确保轻载条件下的出色效率。它具有基于计时器的故障检测功能，可确保检测过载，并具有可调补偿功能，以帮助保持最大功率不受输入电压的影响。

The NCP1239B65WGEVB is a 65 W, 19V, fixed-frequency current-mode controller Evaluation Board featuring the Dynamic Self-Supply. This function greatly simplifies the design of the auxiliary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V, the controller hosts a jittered 65 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 minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current that insures excellent efficiency in light load condition. It features a timer-based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage.