NCV891930 是一款 2 MHz 固定频率低静态电流降压控制器，具有扩频功能，工作电压高达 38 V（典型值）。它可以与时钟或单独的 NCV891930 同步。采用峰值电流模式控制，可在宽输入电压和输出负载范围内实现快速瞬态响应和严格调节。反馈补偿位于器件内部，可简化设计。NCV891930 能够以高于敏感 AM 频段的恒定基本开关频率将汽车输入电压范围从 3.5 V（启动时为 4.5 V）转换为 18 V，从而无需昂贵的滤波器和 EMI 对策。对于 20 V 至 38 V（典型值）之间的输入电压，开关频率折回到 1 MHz。在高达 45 V 的负载突降条件下，调节器关闭。使用可自动切换到外部 5 V 偏置电源的高压偏置调节器来提高效率。提供多种保护功能，例如 UVLO、电流限制、短路保护和热关断。即使使用较小的电感值和全陶瓷输出滤波电容器，高开关频率也会产生较低的输出电压纹波，从而形成节省空间的开关解决方案。

The NCV891930 is a 2 MHz fixed?frequency low quiescent current buck controller with spread spectrum that operates up to 38 V (typical). It may be synchronized to a clock or to separate NCV891930. Peak current mode control is employed for fast transient response and tight regulation over wide input voltage and output load ranges. Feedback compensation is internal to the device, permitting design simplification. The NCV891930 is capable of converting from an automotive input voltage range of 3.5 V (4.5 V during startup) to 18 V at a constant base switching frequency above the sensitive AM band, eliminating the need for costly filters and EMI countermeasures. The switching frequency folds back to 1 MHz for input voltages between 20 V up to 38 V (typical). Under load dump conditions up to 45 V the regulator shuts down. A high voltage bias regulator with automatic switchover to an external 5 V bias supply is used for improved efficiency. Several protection features such as UVLO, current limit, short circuit protection, and thermal shutdown are provided. High switching frequency produces low output voltage ripple even when using small inductor values and an all?ceramic output filter capacitor, forming a space?efficient switching solution.