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| NCV78763 單片高效智能功率LED驅動方案 |
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| 文章來源： 更新時間：2014/12/13 10:09:00 |
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On Semi公司的NCV78763是單片高效智能功率鎮流器和雙路LED驅動器,設計用于汽車照明如遠光燈,近光燈,白天行車燈DRL),轉彎燈,霧燈,彎道輔助照明角燈等.LED串電壓高達60V,每個輸出6A,是一個完整的解決方案.本文介紹了NCV78763主要特性,框圖, 典型應用電路圖,兩相,三相應用電路,以及評估板NV787630R1DAGEVB電路圖,材料清單.
The NCV78763 is a single−chip and high efficient smart Power ballast and Dual LED DRIVER designed for automotive front lighting applications like high beam, low beam, daytime running light (DRL), turn indicator, fog light, static cornering and so on.
The NCV78763 is a best fit for high current LEDs and provides a complete solution to drive two strings up to 60 V, by means of two internal independent buck switch channel outputs, with a minimum of external components. For each individual LED channel, the output current and voltage can be customized according to the application requirements. An on−chip diagnostic feature for automotive front lighting is provided, easing the safety monitoring from the microcontroller. The device integrates a current−mode voltage booster controller, realizing a unique input current filter with a limited BOM.
When more than two LED channels are required on one module, then two, three or more NCV78763 devices can be combined, with the possibility for the booster circuits to operate in multiphase−mode. This helps to further optimize the filtering effect of the booster circuit and
allows a cost effective dimensioning for mid to high power LED systems.
Due to the SPI programmability, one single hardware setup can support multiple system configurations for a flexible platform solution approach.
NCV78763主要特性:
• Single Chip Boost−Buck Solution
• Two LED Strings up to 60 V
• High Current Capability up to 1.6 A DC per Output
• High Overall System Efficiency
• Minimum of External Components
• Active Input Filter with Low Current Ripple from Battery
• Integrated Switched Mode Buck Current Regulator
• Integrated Boost Current−mode Controller
• Programmable Input Current Limitation
• Average Current Regulation Through the LEDs
• High Operating Frequencies to Reduce Inductor Sizes
• Integrated PWM Dimming with Wide Frequency Range
• Low EMC Emission for LED switching and dimming
• SPI Interface for Dynamic Control of System Parameters
• These are Pb−Free Devices
NCV78763典型應用:
• Front Lighting High Beam and Low Beam
• Day time Running Light (DRL)
• Position or Park light
• Turn Indicator
• Fog Light and Static Cornering
圖1. NCV78763框圖
圖2. NCV78763典型應用電路圖
圖3. NCV78763升壓兩相應用電路圖(N=2)
圖4. NCV78763升壓三相應用電路圖(N=3)
評估板NV787630R1DAGEVB:功率LED升壓-降壓1.6A/60V
圖5.評估板NV787630R1DAGEVB外形圖
圖6.評估板NV787630R1DAGEVB電路圖
評估板NV787630R1DAGEVB材料清單:
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