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| NCP1397采用GaN HEMT器件電源參考設(shè)計 |
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| 文章來源： 更新時間：2015/4/10 9:34:00 |
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On Semi公司的NCP1397高性能電源轉(zhuǎn)換控制器,集成了600V柵極驅(qū)動器,簡化了PCB布局和降低外接元件數(shù)量,工作頻率從50 kHz到500 kHz,開關(guān)頻率精度±3%,主要用在平板顯示器電源,大功率AC/DC轉(zhuǎn)換器,計算機(jī)電報掛號源,工業(yè)和醫(yī)療設(shè)備電源,離線電池充電器.本文介紹了NCP1397主要特性, 內(nèi)部框圖, 典型應(yīng)用電路圖以及高壓驅(qū)動器評估板NCP1397GANGEVB主要特性,電路圖和材料清單.
The NCP1397 is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and LLC resonant converters. It integrates 600 V gate drivers, simplifying layout and reducing external component count. With its unique architecture, including a 500 kHz Voltage Controlled Oscillator whose control mode permits flexibility when an ORing function is required, the NCP1397 delivers everything needed to build a reliable and rugged resonant mode power supply. The NCP1397 provides a suite of protection features with configurable settings to optimize any application. These include: auto-recovery or fault latch-off, brown-out, open optocoupler, soft-start and short-circuit protection. Deadtime is also adjustable to overcome shoot through current.
NCP1397主要特性:
• High−Frequency Operation from 50 kHz up to 500 kHz
• 600 V High−Voltage Floating Driver
• Adjustable Minimum Switching Frequency with ±3% Accuracy
• Adjustable Deadtime from 100 ns to 2 _s.
• Startup Sequence Via an Externally Adjustable Soft−Start
• Brown−Out Protection for a Simpler PFC Association
• Latched Input for Severe Fault Conditions, e.g. Over Temperature orOVP
• Timer−Based Input with Auto−Recovery Operation for DelayedEvent Reaction
• Latched Overcurrent Protection
• Disable Input for Immediate Event Reaction or Simple ON/OFFControl
• VCC Operation up to 20 V
• Low Startup Current of 300 _A
• 1 A/0.5 A Peak Current Sink/Source Drive Capability
• Common Collector Optocoupler Connection for Easier ORing
• Optional Common Emitter Optocoupler Connection
• Internal Temperature Shutdown
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHSCompliant
NCP1397應(yīng)用:
• Flat Panel Display Power Converters
• High Power ac−dc Adapters for Notebooks
• Computing Power Supplies
• Industrial and Medical Power Sources
• Offline Battery Chargers
NCP1397終端產(chǎn)品:
Notebook Adapters
LCD TVs
ATX power supplies
圖1.NCP1397A內(nèi)部框圖
圖2. NCP1397B內(nèi)部框圖
圖3. NCP1397典型應(yīng)用電路圖
高壓驅(qū)動器評估板NCP1397GANGEVB
The NCP1397GANGEVB reference design provides a 12 V/20 A power supply using Gallium Nitride (GaN) HEMTs as the switching devices. The front-end of the power converter converts a universal AC line to a 385 dc bus while achieving near unity power factor. The second stage is a DC-DC stage that converts the 385 V DC bus to a 12 V output with a max rated load current of 20 A.
The Boost PFC stage employs ON Semiconductor’s NCP1654 CCM controller. The second stage is an isolated DC-DC converter that converts the 385 V dc bus to a 12 V dc voltage output and employs ON Semiconductor?s NCP1397 LLC controller. Synchronous rectification is achieved with the NCP4304 synchronous controller on the secondary side to improve efficiency. The NCP432 is utilized in the feedback path to regulate the output voltage. The board utilizes GaN HEMTs as the switching devices in both the PFC stage and in the primary side of the LLC stage.
圖4.評估板NCP1397GANGEVB外形圖
圖5.評估板NCP1397GANGEVB電路圖(1)
圖6.評估板NCP1397GANGEVB電路圖(2)
圖7.評估板NCP1397GANGEVB電路圖(3)
評估板NCP1397GANGEVB材料清單:
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