原标题：TI TPS40170宽输入电压电源PWM控制解决方案

　　TI 公司的TPS40170是宽输入电压(4.5V-60V)同步电源PWM控制器，集成的600mV基准电压精度为1%，可编程频率从100kHz到600kHz，具有系统保护和监视功能，如可编UVLO，可编OCP等，LDO输出8.0-V和 3.3-V，主要用在POL模块，工业，网络和通信设备的高功率密度DC/DC转换器。本文介绍了TPS40170主要特性，方框图，应用设计电路图及其材料清单，以及TPS40170EVM-578评估板主要特性，电路图，材料清单和PCB布局图。

　　TPS40170：4.5- V TO 60-V WIDE-INPUT SYNCHRONOUS PWM BUCK CONTROLLER TPS40170 is a full-featured, synchronous PWM buck controller that operates at an input voltage between 4.5 V and 60 V and is optimized for high- power-density, high-reliability DC/DC converter applications. The controller implements voltage-mode control with input-voltage feed-forward compensation that enables instant response to input voltage change. The switching frequency is programmable from 100 kHz to 600 kHz.

　　The TPS40170 has a complete set of system protection and monitoring features such as programmable UVLO, programmable overcurrent protection (OCP) by sensing the low-side FET, selectable short-circuit protection (SCP) by sensing the high-side FET and thermal shutdown. The ENABLE pin allows for system shutdown in a low-current (1 µA typical) mode.

　　TPS40170主要特性:

　　Wide-Input Voltage Range from 4.5 V to 60 V

　　600-mV Reference Voltage with 1% Accuracy

　　Programmable UVLO and Hysteresis

　　Voltage Mode Control With Voltage Feed Forward

　　Programmable Frequency Between 100 kHz and 600 kHz

　　Bi-directional -Frequency Synchronization With Master/Slave Option

　　Low-side FET Sensing Overcurrent Protection and High-Side FET Sensing Short-circuit Protection With Integrated Thermal Compensation

　　Programmable Closed Loop Soft-Start

　　Supports Pre-Biased Outputs

　　Thermal Shutdown at 165°C with Hysteresis

　　Voltage Tracking

　　Power Good

　　ENABLE. 1-µA Low Current Shutdown

　　8.0-V and 3.3-V LDO Output

　　Integrated Bootstrap Diode

　　20-Pin 3.5 mm × 4.5 mm QFN (RGY) Package

　　TPS40170应用:

　　POL Modules

　　Wide Input Voltage, High-Power Density DC/DC Converters for Industrial, Networking and Telecomm Equipment

　　图1。TPS40170方框图

　　图2。TPS40170简化应用电路图

　　图3。TPS40170应用设计电路图

　　应用设计电路材料清单(BOM)：

　　TPS40170EVM-578评估板

　　The TPS40170EVM-578 evaluation module (EVM) is a synchronous buck converter providing a fixed 5-V output at up to 6 A from a 10-V to 60-V input bus. The EVM is designed to start up from a single supply; no additional bias voltage is required for start-up. The module uses the TPS40170 high-performance, wide-input voltage, synchronous buck controller.

　　TPS40170EVM-578评估板主要特性：

　　• 10-V to 60-V input voltage rating (down to 6 V with UVLO resistor change)

　　• 5-V ±2% output voltage rating

　　• 6-A, steady-state load current

　　• 94% efficiency 24 V to 5 V at 6 A

　　• 300-kHz switching frequency

　　• Simple access to IC features including synchronization, tracking, power good, and enable

　　• Convenient test points for simple, non-invasive measurements of converter performance and features

　　TPS40170EVM-578评估板应用：

　　• Wide-input, unregulated bus applications

　　• Non-isolated telecom/datacom converters

　　• Automotive electronics

　　图4。TPS40170EVM-578评估板电路图

　　TPS40170EVM-578评估板材料清单(BOM)：