CXLE83181DN is a high-performance LED constant current driver chip designed specifically for general-purpose power supplies. It operates in critical conduction mode (CrM), effectively reducing switching losses and electromagnetic interference (EMI) while improving system efficiency. This chip significantly simplifies the number of external components and reduces system costs and design complexity by removing VCC and COMP capacitors from traditional circuits.
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[ CXLE83181DN ]"
In today's rapidly developing LED lighting industry, efficient, reliable, and high power factor driving solutions have become the mainstream demand in the market.CXLE83181DN As a high-precision non isolated buck LED driver chip with integrated active power factor correction (APFC), it is widely used in various general LED lighting products due to its simple peripheral design, excellent electrical performance, and comprehensive system protection. This article will deeply analyze the technical characteristics, design methods, and application advantages of CXLE83181DN, providing valuable references for engineers and procurement decisions.
1、 Chip Overview and Core Features
CXLE83181DN is a high-performance LED constant current driver chip designed specifically for general-purpose power supplies. It operates in critical conduction mode (CrM), effectively reducing switching losses and electromagnetic interference (EMI) while improving system efficiency. This chip significantly simplifies the number of external components and reduces system costs and design complexity by removing VCC and COMP capacitors from traditional circuits.
Its main technical features include:
· High power factor and low harmonicsBuilt in active PFC circuit with high PF value and low THD, meeting global energy efficiency standards;
· Design of VCC/COMP capacitor without VCThe system has a simple structure and higher reliability;
· External current sampling resistorSupport flexible output current settings;
· Critical conduction mode operationOptimize EMI performance and improve overall efficiency;
· Multiple protection mechanismsIntegrated LED short-circuit protection, open circuit protection (OVP adjustable), cycle by cycle current limiting, and overheating regulation;
· Enable feature supportCompatible with dimming, color adjustment, and intelligent sensing control;
· SOP7 encapsulationCompact structure, good heat dissipation, suitable for automated assembly production.
2、 Detailed explanation of electrical performance and parameters
CXLE83181DN has excellent stability and adaptability in electrical design. It integrates high-voltage power MOSFET internally, with a breakdown voltage of 600V and a minimum on resistance of only 2.2 Ω; (FN version), suitable for applications with wide voltage inputs. The working junction temperature range of the chip is -40 ℃ to 150 ℃, and it has intelligent temperature regulation function. When the surface temperature of the chip reaches 140 ℃, it automatically reduces the output current to achieve overheating protection.
The key electrical parameters are as follows:
· The typical value of static working current is 0.4mA, with a maximum of 0.6mA;
· Maximum conduction time 6.6&ms, maximum turn off time 200&ms;
· The peak voltage limit of CS pin is 1.8V, supporting 300ns leading edge blanking and 200ns turn off delay;
· The typical value of the internal reference voltage is 300mV, with an accuracy of up to± 3%；
· The OVP pin outputs a current of approximately 100 A and supports setting open circuit protection voltage with external resistors.
3、 Typical Applications and Design Guidelines
CXLE83181DN is widely used in general lighting products such as LED bulb lights and LED tubes. Its typical application circuit is simple and clear, with flexible design, and users can easily adapt to different output requirements by adjusting peripheral components.
The calculation formula for LED output current is:
Among them, VREF For internal reference voltage (typical 300mV), RCS; A current sampling resistor. By selecting the appropriate RCS, the output current can be precisely controlled.
Formula for setting open circuit protection voltage:
Among them, L is the inductance value (in mH), ROVP Ground resistance of OVP pin (unit: kΩ); ）. It should be noted that the ROVP pin also has an Enable function: when the voltage is above 0.3V, the chip is turned on, and when it is below 0.1V, the chip is turned off. Therefore, the ROVP resistance should be greater than 3k Ω;. If OVP function is not required, the pin can be left hanging.
4、 System protection and reliability design
The CXLE83181DN is equipped with comprehensive protection mechanisms, significantly improving the reliability of the system under abnormal operating conditions
· short circuit protectionWhen there is an output short circuit, the chip automatically enters a low-frequency working mode (5kHz), limiting the output current;
· open-circuit protectionSet the OVP threshold through an external resistor to prevent excessive output voltage;
· Cycle by cycle current limitationReal time monitoring of CS voltage to prevent inductance saturation and MOSFET overcurrent;
· Overheating regulationGradually reduce the output current when the chip temperature rises to achieve temperature control closed-loop;
· Frontier blanking and turn off delayEnhance the system's anti-interference ability and avoid false triggering.
5、 Suggestions for PCB layout and heat dissipation optimization
Good PCB design is the key to ensuring system performance and EMI compliance:
5.1. Ground wire layoutThe power ground of the current sampling resistor should be short and thick, as close as possible to the GND pin of the chip;
5.2. Power Loop OptimizationThe area of the main power circuit (such as DRAIN inductor freewheeling diode) should be minimized to reduce radiated noise;
5.3. DRAIN pin heat dissipationAppropriately increase the copper surface area to improve heat dissipation performance, but be careful to avoid introducing high-frequency interference;
5.4. CS pin processingIt should be kept away from high-frequency switch nodes and have a compact layout to improve sampling accuracy and heat dissipation effect.
6、 Packaging and ordering information
CXLE83181DN adopts SOP7 packaging, with compact size and clear pin definition, suitable for high-density PCB layout. The ordered model is CXLE83181DN, with a working environment temperature range of -40 ℃ to 105 ℃. The packaging is in the form of reels, with 4000 pieces per reel, clearly labeled for easy production management and traceability.
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8、 Conclusion
CXLE83181DN provides an efficient, reliable, and concise driving solution for LED lighting systems with its high-precision constant current output, high power factor, high integration, and comprehensive protection functions. Whether it is bulb lamps that pursue high luminous efficiency and long lifespan, or lamp systems that require stable operation, this chip can be competent and help products maintain competitiveness in the market.
For complete data manuals, application notes, sample requests, or procurement support, please visit;jtm-ic.comWe will provide you with professional and timely technical services and product support.
