原标题：TI LM5160A宽输入三相逆变器电源参考设计

　　TI公司的LM5160A系列产品是集成了高边和低边MOSFET的65V 1,5A同步降压转换器,负载电流1.5A,不需要外接回路补偿,快速瞬态响应,可选择CCM或DCM工作,频率可调高达1MHz,具有热关断保护,主要用于工业PLC, IGBT栅极驱动电源,低功率隔离DC/DC转换器(Fly-Buck),汽车电子,通信初级/次级偏压电源,动力线通信等.本文介绍了LM5160A 主要特性,功能框图,几种应用电路,以及三相逆变器电源参考设计主要特性,系统框图,电路图,材料清单和PCB元件布局图.

　　The LM5160 family is a 65-V, 1.5-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-on-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The on-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The under-voltage lockout (EN/UVLO) circuit provides independently adjustable input under-voltage threshold and hysteresis. The LM5160 is programmed through the FPWM pin to operate in continuous conduction mode (CCM) from no load to full load or to automatically switch to discontinuous conduction mode (DCM) at light load for higher efficiency. Forced CCM operation supports multiple output and isolated Fly-Buck applications using a coupled inductor.

　　The LM5160A shares the same features and pin configuration as the LM5160. An external bias supply can be connected to the VCC pin of the LM5160A in either Buck or Fly-Buck applications. This additional capability can improve efficiency at high input voltages.

　　LM5160A主要特性:

　　Wide 4.5-V to 65-V Input Voltage Range

　　Integrated High and Low Side Switches

　　No Schottky Diode Required

　　1.5-A Maximum Load Current

　　Constant On-Time Control

　　No External Loop Compensation

　　Fast Transient Response

　　Selectable Forced CCM or DCM Operation

　　CCM Option Supports Multi-Output Fly-Buck

　　Nearly Constant Switching Frequency

　　Frequency Adjustable up to 1 MHz

　　Programmable Soft-Start Time

　　Pre-Biased Startup

　　Peak Current Limiting Protection

　　Adjustable Input UVLO and Hysteresis

　　±1% Feedback Voltage Reference

　　LM5160A allows external VCC Bias

　　Thermal Shutdown Protection

　　LM5160A应用:

　　Industrial Programmable Logic Controller

　　IGBT Gate Drive Bias Supply

　　Telecom Primary/Secondary Side Bias

　　E-meter Power Line Communication

　　Low Power Isolated DC-DC (Fly-Buck)

　　Automotive Electronics

　　图1.LM5160A功能框图

　　图2.LM5160A同步降压应用电路图

　　图3.LM5160A 12V/4.5W Fly-Buck转换器电路图

　　图4.LM5160A 12V/4.5W带LM5169A Fly-Buck转换器电路图

　　三相逆变器电源参考设计

　　This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. Utilizing a Fly-Buck™ control topology, this reference design uses a single transformer for generating power rails for all three arms of the 3-phase inverter. It uses primary-side regulation and can achieve good cross regulation without opto-coupler feedback or an auxiliary winding. The isolated outputs are generated through the coupled windings of the transformer. The voltage rails for all the high-side IGBTs are individually isolated, whereas the voltage rails for all low-side IGBTs are combined.

　　三相逆变器电源参考设计主要特性:

　　• Isolated power supply with 24V±20% input range that supports 6 IGBT gate drivers for 3-phase inverter (each arm in half-bridge configuration)

　　• Low-ripple (<200mV) bias outputs (+15V & -8V) with output power of 2.3W for each IGBT of the 3-phase inverter

　　• Fly-Buck topology provides easy-to-design multi-output isolated power supply solution with primary side regulation

　　• Peak efficiency of 82% at balanced full-load

　　• Output capacitors rated to support up to 6A peak gate drive current

　　三相逆变器电源参考设计主要应用:

　　• Variable Speed AC and DC Drives

　　• Industrial Inverters and Solar Inverters

　　• UPS Systems

　　• Servo Drives

　　• IGBT Based High-Voltage DC (HVDC) Systems

　　图5.三相逆变器电源参考设计外形图

　　Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters

　　三相逆变器电源TIDA-00199材料清单: