CXLE86203 is a LED driver based on linear architecture expansion chip, using SOT89-3 package, internal integration of high-voltage power MOS tube, with low on-resistance and high breakdown voltage characteristics. The chip is designed to cooperate with the CXLE86202 main control chip, through the unique current control technology, without significantly increasing the complexity of the system, effectively expand the output current and power range, to meet the bulb lamp, downlight, panel lights and other high-power LED lighting products drive requirements.
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[ CXLE86203 ]"
CXLE86203: high-performance LED linear driver current expansion chip technology and application full analysis
在LED照明系统设计中，实现高功率输出并保持系统简洁性与高可靠性是众多工程师面临的挑战。CXLE86203作为嘉泰姆（JTM-IC）推出的一款专用于LED线性驱动的扩流芯片，结合专有均流控制技术，可与主控芯片CXLE86202协同工作，显著提升系统输出能力，适用于中大功率LED照明应用。本文将深入解析CXLE86203的技术特性、系统架构、设计要点及典型应用场景，为高性价比、高可靠性LED驱动方案设计提供完整参考。
1. product overview and market positioning
CXLE86203 is a LED driver based on linear architecture expansion chip, using SOT89-3 package, internal integration of high-voltage power MOS tube, with low on-resistance and high breakdown voltage characteristics. The chip is designed to cooperate with the CXLE86202 main control chip, through the unique current control technology, without significantly increasing the complexity of the system, effectively expand the output current and power range, to meet the bulb lamp, downlight, panel lights and other high-power LED lighting products drive requirements.
Compared with the traditional switching power supply scheme, the CXLE86203 combines a linear drive architecture and eliminates magnetic components such as electrolytic capacitors and inductors. The system structure is more concise, the life is longer, and the anti-interference performance is better. It is especially suitable for volume, cost and reliability. Lighting scenes with higher requirements.
2. core features and technical advantages
1. Proprietary average flow control technology.
The chip adopts an advanced flow-sharing control mechanism to ensure that when multiple chips are connected in parallel or work together with the main control chip, the current of each path is balanced and consistent to avoid brightness differences or local overheating caused by uneven current.
2. High integration and concise peripheral
Internal integration of 500V high voltage power MOS tube, conduction impedance typical value of 14Ω, with good conduction characteristics and heat dissipation performance. The system does not require complex peripheral circuits, significantly reducing BOM costs and PCB area.
3. Compatible with SCR dimming
With the CXLE86202 main control chip, it supports leading-edge phase cut (TRIAC) dimming, is compatible with most dimmers on the market, and the dimming process is smooth and flicker-free, meeting the demand for light tuning in smart home and commercial lighting.
4. High reliability design
The chip has a high voltage breakdown capability of 500V and adapts to a wide voltage fluctuation environment. SOT89-3 package has good heat dissipation performance and welding reliability, suitable for automatic chip and mass production.
3. key electrical parameters and package information
The CXLE86203 is available in a compact SOT89-3 package for space-constrained applications. The main electrical parameters are as follows:
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On-resistance (Rdson): 14Ω (typical) @ VGS = 10V, IDS = 0.3A
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Breakdown voltage (BVdss): 500V (min) @ VGS = 0V, IDS = 250μA
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Package Type：SOT89-3
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Operating temperature range:-40 ℃ ~ 150 ℃
4. system architecture and working principle
1. Typical application circuit
In a typical application, the CXLE86203 and the CXLE86202 master chip work together to form a complete linear drive power system. The main control chip is responsible for constant current control, dimming signal processing and system protection, while the CXLE86203, as a current expansion unit, undertakes part of the power output task to achieve high efficiency and low ripple LED driver.
2. Flow expansion mechanism and flow-averaging principle
Through the CS (current detection) pin real-time monitoring of current, combined with the internal current-balancing algorithm, the chip automatically adjusts the GATE drive signal to ensure that the current of each power path is balanced. This mechanism effectively avoids the current imbalance caused by device parameter deviation or uneven temperature, and improves the overall stability and life of the system.
3. Drive and dimming compatibility
The GATE pin receives the driving signal from the main control chip and controls the on and off of the internal power MOS. In dimming applications, the system achieves PWM or analog dimming by adjusting the on-time or peak current, and is compatible with a variety of dimming protocols and controllers.
5. PCB Design and Thermal Optimization
To ensure system performance and reliability, PCB design should pay attention to the following points:
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Power loop minimization: The power loop between DRN and CS should be as short and wide as possible to reduce parasitic inductance and resistance, and reduce switching noise and loss.
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Heat dissipation design: The metal heat sink at the bottom of the chip should be connected to the underlying copper foil through multiple vias to make full use of the PCB for heat dissipation, and a heat sink can be attached if necessary.
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signal isolation: GATE drive signal should be far away from the high-voltage switch node to prevent noise coupling leading to malfunction.
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current sampling resistor: RS resistor shall be of high precision and low temperature drift type. The layout shall be as close to CS pin as possible, and the grounding terminal shall be connected with star type.
6. typical application scenarios
CXLE86203 CXLE86202 combination scheme is widely applicable to the following LED lighting products:
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LED bulb lamp(A19, PAR30/38, etc.)
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LED downlight and panel light
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T8/T5 LED Tube
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Mining lamp and high ceiling lamp
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Intelligent dimming lamps and lanterns
The scheme combines the simplicity of linear drive, the compatibility of silicon controlled dimming and the ability of high power output, and is a very competitive solution in the medium and high power LED lighting market.
7. epilogue
As a high-performance chip designed for LED linear driver expansion, CXLE86203 provides a simple, efficient and low-cost drive solution for medium and high-power LED lighting systems with its proprietary current-flow control technology, high integration and excellent reliability. Whether upgrading traditional luminaires or developing new smart lighting, the chip helps engineers find the best balance between power expansion, system cost and reliability.
For CXLE86203 samples, technical documentation or application support, please visitJTM-IC official websiteOr contact our technical support team. Jiatem Electronics (JTM-IC) has always been committed to providing global customers with high-quality, high-reliability power management IC products and system solutions, helping your products continue to lead the market competition.
