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TI公司的LMG3410R050是具有過流保護的600-V 50-mΩ?GaN功率放大級,比硅MOSFET具有固有的優勢包括超低輸入和輸出電容,零反向恢復以降低開關損耗達80%之多,以及低開關節點振鈴以降低EMI,20ns傳輸時延用于MHz工作,25-100V/ns用戶可調轉換速率,具有強健的保護,不需要外接保護元件,主要用在高密度工業和消費類電源,多級轉換器,太陽能逆變器,工業馬達驅動,不間斷電源(UPS)以及高壓電池充電器.本文介紹了LMG3410R050主要特性, 功能框圖和應用電路,以及評估板LMG3410EVM-018和LMG34xx-BB-EVM主要特性和指標,電路圖,材料清單和PCB設計圖.
The LMG3410R050 GaN power stage with integrated?driver and protection enables designers to achieve?new levels of power density and efficiency in power?electronics systems. The LMG3410’s inherent?advantages over silicon MOSFETs include ultra-low
input and output capacitance, zero reverse recovery?to reduce switching losses by as much as 80%, and?low switch node ringing to reduce EMI. These?advantages enable dense and efficient topologies like?the totem-pole PFC.
The LMG3410R050 provides a smart alternative to?traditional cascode GaN and standalone GaN FETs?by integrating a unique set of features to simplify?design, maximize reliability and optimize the?performance of any power supply. Integrated gate?drive enables 100V/ns switching with near zero Vds?ringing, <100 ns current limiting self-protects against?unintended shoot-through events, Overtemperature?shutdown prevents thermal runaway, and system?interface signals provide self-monitoring capability.
LMG3410R050 is a high-performance 600-V GaN transistor with integrated gate driver. The GaN transistor?provides ultra-low input and output capacitance and zero reverse recovery. The lack of reverse recovery enables?efficient operation in half-bridge and bridge-based topologies.
TI utilizes a Direct Drive architecture to control the GaN FET within the LMG3410R050. When the driver is?powered up, the GaN FET is controlled directly with the integrated gate driver. This architecture provides?superior switching performance compared with the traditional cascode approach.
The integrated driver solves a number of challenges using GaN devices. The LMG3410R050 contains a driver?specifically tuned to the GaN device for fast driving without ringing on the gate. The driver ensures the device?stays off for high drain slew rates up to 150 V/ns. In addition, the integrated driver protects against faults by?providing overcurrent and overtemperature protection. This feature can protect the system in case of a device?failure, or prevent a device failure in the case of a controller error or malfunction.
Unlike silicon MOSFETs, there is no p-n junction from source to drain in GaN devices. That is why GaN devices?have no reverse recovery losses. However, the GaN device can still conduct from source to drain in 3rd quadrant?of operation similar to a body diode but with higher voltage drop and higher conduction loss. 3rd quadrant?operation can be defined as follows; when the GaN device is turned off and negative current pulls the drain node?voltage to be lower than its source. The voltage drop across GaN device during 3rd quadrant operation is high;?therefore, it is recommended to operate with synchronous switching and keep the duration of 3rd quadrant?operation at minimum.
LMG3410R050主要特性:
1? TI GaN Process Qualified Through Accelerated?Reliability In-application Hard-switching Mission?Profiles
? Enables High Density Power Conversion Designs
– Superior System Performance Over Cascode?or Stand-alone GaN FETs
– Low Inductance 8mm x 8mm QFN Package for?Ease of Design, and Layout
– Adjustable Drive Strength for Switching
Performance and EMI Control
– Digital Fault Status Output Signal
– Only +12 V Unregulated Supply Needed
? Integrated Gate Driver
– Zero Common Source Inductance
– 20 ns Propagation Delay for MHz Operation
– Process-tuned Gate Bias Voltage for Reliability
– 25 to 100V/ns User Adjustable Slew Rate
? Robust Protection
– Requires No External Protection Components
– Overcurrent Protection with <100ns Response
– >150V/ns Slew Rate Immunity
– Transient Overvoltage Immunity
– Overtemperature Protection
– UVLO Protection on All Supply Rails
LMG3410R050應用:
? High Density Industrial and Consumer Power?Supplies
? Multi-level Converters
? Solar Inverters
? Industrial Motor Drives
? Uninterruptable Power Supplies
? High Voltage Battery Chargers
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圖1.?LMG3410R050簡化框圖
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圖2.?LMG3410R050功能框圖
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圖3.?LMG3410R050用來確定開關參數的電路圖
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圖4.?LMG3410R050應用電路圖
評估板LMG3410EVM-018
The LMG3410EVM-018 features two LMG3410R050 600V GaN power transistors with integrated drivers?that are configured in a half bridge with all the required bias circuit and logic/power level shifting. Essential?power stage and gate driving high frequency current loops are fully enclosed on the board to minimize?parasitic inductances, reducing voltage overshoots and improving performance. The LMG3410EVM-018 is?configured to have a socket style external connection for easy interface with external power stages to run?the LMG3410R050 in various applications.
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圖5.評估板LMG3410EVM-018簡化電路
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圖6.評估板LMG3410EVM-018外形圖(頂視)
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圖7.評估板LMG3410EVM-018外形圖(底視)
評估板LMG3410EVM-018主要特性和指標:
? Two options to bias the LMG3410, isolated power or from bootstrap diode
? Over temperature, overcurrent, and under voltage lockout protection with FAULT indication that is level?shifted to an AGND referenced signal
? Gate logic input support of either 3.3V or 5V logic
? Maximum recommended operating voltage of 480V and absolute maximum voltage of 600V
評估板LMG34xx-BB-EVM主要特性和指標:
? Requires only a single 12V bias supply
? Requires only a single 0V to 5V PWM input to generate gate drive signal
? PWM disable in the event of a fault from the LMG3410EVM-018
? Maximum recommended operating voltage of 480V and absolute maximum voltage of 600V
? Maximum recommended operating inductor current of 8A
The LMG3410EVM-018 is designed for use in AC/DC, DC/DC and DC/AC applications
? Totem-Pole PFC converters
? Phase-Shifted Full Bridge or LLC Converter
? Buck converter such as the LMG34XX-BB-EVM
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圖8.評估板LMG3410EVM-018電路圖
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圖9.評估板LMG34xx-BB-EVM電路圖
評估板LMG3410EVM-018材料清單:
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評估板LMG34XX-BB-EVM-018材料清單
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圖10. 評估板LMG3410EVM-018和LMG34XX-BB-EVM連接圖
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圖11. 評估板LMG3410EVM-018?PCB設計圖:左:內部銅層2;右:底層和元件
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圖12. 評估板LMG34XX-BB-EVM?PCB設計圖:左:頂層和元件;右:底層和元件
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