TI TPS40170宽输入电压电源PWM控制解决方案

TI TPS40170宽输入电压电源PWM控制解决方案

关键词：电源管理,DC/DC转换器,PWM

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 I C 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）：

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图5。TPS40170EVM-578评估板布局图（顶层）