TPS40197 - 具有 4 位 VID 接口和电源状态良好指示的 4.5V 至 14V 输入同步降压控制器

TPS40197是TI德州仪器公司的一款控制器（外部开关）产品，TPS40197是具有 4 位 VID 接口和电源状态良好指示的 4.5V 至 14V 输入同步降压控制器，本站介绍了TPS40197的封装应用图解、特点和优点、功能等，并给出了与TPS40197相关的TI元器件型号供参考。

TPS40197 - 具有 4 位 VID 接口和电源状态良好指示的 4.5V 至 14V 输入同步降压控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The TPS40197 is a synchronous buck controller that operates from 4.5 V to 14 V input supply nominally. The controller implements voltage-mode control architecture with the switching frequency fixed at 520kHz. The higher switching frequency facilitates the use of smaller inductor and output capacitors, thereby providing a compact power-supply solution. An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs.

The TPS40197 integrates the PWM control and 4-bit VID interface in a single chip to allow seamless on-the-fly VID changes with programmable transition rate. It provides a simple power solution for Smart-Reflex™ DSP cores.

Short circuit detection is done by sensing the voltage drop across the low-side FET when it is on and comparing it with a user selected threshold of 100 mV, 200 mV or 280 mV. The threshold is set with a single external resistor connected from COMP to GND. This resistor is sensed at startup and the selected threshold is latched. Pulse by pulse limiting (to prevent current runaway) is provided by sensing the voltage across the high-side FET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of 550 mV. When the controller senses an output short circuit, both FETs are turned off and a timeout period is observed before attempting to restart. This provides limited power dissipation in the event of a sustained fault.

产品特性

Input Voltage Range: 4.5 V to 14 V
4-Bit Dynamic VID-On-The-Fly Support
VID Programmable Output Voltage with Programmable Transition Rate
Fixed Switching Frequency of 520kHz
Selectable Low-Side (Three Settings) and Fixed High-Side Thermally Compensated Overcurrent Protection
Power Good Indicator
Internal 5-V Regulator
Voltage Mode Control
Internally Fixed 5.5-ms Soft-Start Time
Pre-Bias Output Safe
Thermal Shutdown at 140°C
16-Pin QFN Package

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