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| LM5160A寬輸入三相逆變器電源參考設計 |
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| 文章來源： 更新時間：2015/3/31 9:24:00 |
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TI公司的LM5160A系列產品是集成了高邊和低邊MOSFET的65V 1,5A同步降壓轉換器,負載電流1.5A,不需要外接回路補償,快速瞬態響應,可選擇CCM或DCM工作,頻率可調高達1MHz,具有熱關斷保護,主要用于工業PLC, IGBT柵極驅動電源,低功率隔離DC/DC轉換器(Fly-Buck),汽車電子,通信初級/次級偏壓電源,動力線通信等.本文介紹了LM5160A 主要特性,功能框圖,幾種應用電路,以及三相逆變器電源參考設計主要特性,系統框圖,電路圖,材料清單和PCB元件布局圖.
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應用:
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
圖1.LM5160A功能框圖
圖2.LM5160A同步降壓應用電路圖
圖3.LM5160A 12V/4.5W Fly-Buck轉換器電路圖
圖4.LM5160A 12V/4.5W帶LM5169A Fly-Buck轉換器電路圖
三相逆變器電源參考設計
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.
三相逆變器電源參考設計主要特性:
• 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
三相逆變器電源參考設計主要應用:
• Variable Speed AC and DC Drives
• Industrial Inverters and Solar Inverters
• UPS Systems
• Servo Drives
• IGBT Based High-Voltage DC (HVDC) Systems
圖5.三相逆變器電源參考設計外形圖
Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters
圖6.帶隔離柵極驅動的三相逆變器電源參考設計框圖
圖7.三相逆變器電源系統框圖
圖8.三相逆變器電源TIDA-00199電路圖
三相逆變器電源TIDA-00199材料清單:
圖9.三相逆變器電源TIDA-00199 PCB元件布局圖 |
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