TPS40197RGYR

TPS40197是一款同步降压控制器，可在4.5V至14V的标称输入电源电压下工作。该控制器采用电压模式控制架构，具有520kHz的固定开关频率。由于更高的开关频率有利于使用较小的电感器和输出电容器，因此可实现紧凑型电源解决方案。自适应反交叉传导方案可用于避免功率FET出现直通电流。

TPS40197在单芯片中集成了PWM控制和4位VID接口，可使用可编程的转换率实现无缝即时VID切换。它为Smart-Reflex™DSP内核提供了一个简单的电源解决方案。

短路检测是通过检测低侧FET（通电时）上的压降并将其与用户选择的100mV、200mV或280mV阈值进行比较而实现的。此阈值可通过从COMP连接到GND的单个外部电阻器进行设置。在启动时即对该电阻器进行检测并锁存所选阈值。通过检测高侧FET（通电时）上的电压并在压降上升超过550mV固定阈值时终止周期来提供逐脉冲限流功能（以防止电流失控）。如果控制器检测到输出短路，则会关闭两个FET，并在达到超时时间后尝试重启。这能在持续故障情况下实现有限的功率耗散。

The TPS40197 is a synchronous buck controller which provides all the necessary features to construct a high - performance DC/DC converter. Support for pre - biased outputs eliminates concerns about damaging sensitive loads during startup. Strong gate drivers for the high - side and rectifier MOSFETs decrease switching losses for increased efficiency. Adaptive gate drive timing prevents shoot through and minimizes body diode conduction in the rectifier MOSFET, also increasing efficiency. Selectable short - circuit protection thresholds and hiccup recovery from a short - circuit increase design flexibility and minimize power dissipation in the event of a prolonged output fault. A dedicated enable pin allows the converter to be placed in a very low quiescent current shutdown mode. Internally fixed switching frequency and soft - start time reduce external component count, simplifying design and layout, as well as reducing footprint and cost. The dynamic voltage identification (VID) circuitry is designed to provide Smart - Reflex™power supply solution to DSPs with core voltage optimization.

• 输入电压范围：4.5V至14V
• 4位动态VID即时转换支持
• 具有可编程转换率的VID
• 可编程输出电压
• 520kHz固定开关频率
• 可选的低侧（三个设置）和固定高侧热补偿
• 过流保护
• 电源正常指示器
• 内部5V稳压器
• 电压模式控制
• 内部固定5.5ms软启动时间
• 预偏置输出安全保护
• 140°C时进行热关断
• 16引脚QFN封装

• Smart - Reflex™DSP
• POL模块
• 电信