CXLE8466 is an AC to DC LED driver control chip suitable for wide voltage input. It adopts primary feedback control technology and does not require optocouplers or secondary feedback circuits to achieve high-precision LED current control. Its built-in power factor correction (PFC) function enables the system to operate in critical conduction mode (CRM), with high efficiency and low harmonic distortion characteristics, suitable for LED driving schemes up to 60W.
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[ CXLE8466 ]"
CXLE8466: Comprehensive Analysis of High Power Factor Primary Feedback LED Driver Chip
In the design of LED lighting power supply, high power factor, high-precision constant current output, and system reliability are key indicators for measuring the performance of driving chips. Launched by JTM-ICCXLE8466It is designed specifically for medium to high power LED lighting systemsSingle stage active PFC primary feedback control chipThis article will comprehensively analyze the chip from multiple perspectives, including its technical characteristics, typical applications, working principles, and protection mechanisms, to help engineers better understand and apply the chip and enhance product competitiveness.
1、 Chip Overview and Product Positioning
CXLE8466 is a product suitable forWide voltage inputThe AC to DC LED driver control chip adoptsOriginal edge feedback control technologyHigh precision LED current control can be achieved without the need for optocouplers and secondary feedback circuits. Its built-inPower Factor Correction (PFC) Function, enabling the system toCritical conduction mode (CRM) Running smoothly, it combines high efficiency and low harmonic distortion characteristics, suitable forUp to 60WThe LED driving solution.
This chip adoptsSOT23-6 packagingWith high integration and simple periphery, it is widely used in various LED lamps and decorative lighting systems such as E27/PAR30/GU10/T8/T10.
2、 Core features and technological advantages
• High power factor and low THDSingle stage active PFC architecture, easily meets PF>; 0.9 THD< 15% energy efficiency standard.
• Original feedback mechanismWithout the need for optocouplers and secondary detection circuits, the system structure is simpler and the cost is lower.
• High precision outputLED current accuracy reaches± 3%, ensuring brightness consistency and system stability.
• Comprehensive protection functionIncluding output overvoltage protection, VDD overvoltage protection, short circuit protection, cycle by cycle overcurrent protection, and overheating protection.
• Soft start functionEffectively suppress the current surge during startup and improve the system's lifespan.
3、 Typical Application Circuits and Design Points
CXLE8466 supports a typical flyback topology structure, detecting the auxiliary winding voltage through the DSEN pin to achieve indirect sampling and protection of the output voltage.
Formula for calculating LED output current:
among which
• NP: number of turns of primary winding
• NS: Secondary winding turns
• VFB =400mV (typical value)
• RS: Current detection resistor
Output overvoltage protection setting:
By adjusting the ratio of 3R3 to 4R4, the output overvoltage protection point can be flexibly set.
4、 Detailed explanation of system protection mechanism
CXLE8466 has multiple protection functions to ensure the safe and reliable operation of the system in various abnormal situations:
• Output overvoltage protectionWhen the DSEN voltage exceeds 3.2V, it triggers and the system enters restart mode.
• VDD overvoltage protectionWhen the VDD voltage exceeds 24V, turn off the PWM output to prevent chip damage.
• short circuit protectionWhen the DSEN voltage continues to be below 400mV, the system starts and enters the“ Hiccup” pattern.
• Cycle by Cycle OCPImmediately turn off the power MOS transistor when the CS pin voltage exceeds 1.8V.
• overheat protectionTriggered when the junction temperature exceeds 150 ℃, with a delay of 20 ℃, to ensure long-term stable operation of the system.
5、 PCB design suggestions
To improve system stability and anti-interference ability, it is recommended to pay attention to the following points when designing PCBs:
• VDD bypass capacitorIt should be placed close to the chip pins.
• Current detection resistor RSThe grounding path should be short and thick to avoid introducing noise.
• DSEN voltage divider resistorShould be close to the chip pins and away from high-frequency noise sources.
• Power LoopThe area of transformers, MOSFETs, and rectifier diodes should be minimized to reduce EMI radiation.
6. Conclusion
CXLE8466 is an ideal choice for medium to high power LED lighting driver solutions due to its high power factor, high-precision output, comprehensive protection functions, and simple peripheral design. Whether it is household lighting, commercial lighting fixtures, or industrial lighting systems, this chip can provide efficient, stable, and reliable constant current drive solutions.
For more technical information, sample application or design support, please visit the official website of Jiataimu:jtm-ic.comWe are committed to providing our customers with high-quality products and services.
