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| NCV78763 单片高效智能功率LED驱动方案 |
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| 文章来源： 更新时间：2014/12/13 10:09:00 |
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On Semi公司的NCV78763是单片高效智能功率镇流器和双路LED驱动器,设计用于汽车照明如远光灯,近光灯,白天行车灯DRL),转弯灯,雾灯,弯道辅助照明角灯等.LED串电压高达60V,每个输出6A,是一个完整的解决方案.本文介绍了NCV78763主要特性,框图, 典型应用电路图,两相,三相应用电路,以及评估板NV787630R1DAGEVB电路图,材料清单.
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典型应用:
• Front Lighting High Beam and Low Beam
• Day time Running Light (DRL)
• Position or Park light
• Turn Indicator
• Fog Light and Static Cornering
图1. NCV78763框图
图2. NCV78763典型应用电路图
图3. NCV78763升压两相应用电路图(N=2)
图4. NCV78763升压三相应用电路图(N=3)
评估板NV787630R1DAGEVB:功率LED升压-降压1.6A/60V
图5.评估板NV787630R1DAGEVB外形图
图6.评估板NV787630R1DAGEVB电路图
评估板NV787630R1DAGEVB材料清单:
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