CXLE83180DN is a high-performance LED driver chip designed specifically for general-purpose power supplies. It operates in critical conduction mode (CrM), significantly reducing switching losses and electromagnetic interference (EMI) while improving system efficiency. The chip greatly simplifies the Bill of Materials (BOM) and reduces system costs and layout complexity by removing VCC capacitors, COMP capacitors, and some resistors from traditional designs.
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[ CXLE83180DN ]"
In the design of LED lighting systems, the performance of the driver chip directly affects the energy efficiency, stability, and lifespan of the entire lamp.CXLE83180DN As a high-precision non isolated buck LED driver chip with integrated active power factor correction (APFC), it has become an ideal choice for various general lighting applications due to its simple peripheral design, high power factor, excellent constant current accuracy, and comprehensive protection functions. This article will comprehensively analyze the core advantages of CXLE83180DN from multiple dimensions such as technical characteristics, design points, and application scenarios, providing valuable references for lighting design and procurement personnel.
1、 Overview and Technical Highlights of Chips
CXLE83180DN is a high-performance LED driver chip designed specifically for general-purpose power supplies. It operates in critical conduction mode (CrM), significantly reducing switching losses and electromagnetic interference (EMI) while improving system efficiency. The chip greatly simplifies the Bill of Materials (BOM) and reduces system costs and layout complexity by removing VCC capacitors, COMP capacitors, and some resistors from traditional designs.
Its main technical highlights include:
· High power factor and low harmonic distortionBuilt in active PFC circuit, PF value can reach 0.9 or above, meeting global energy efficiency regulations;
· Design of VCC/COMP capacitor without VCThe system is simpler and more reliable;
· Critical conduction mode operationOptimize EMI performance and improve overall efficiency;
· Full protection integrationSupport LED short circuit protection, open circuit protection (OVP adjustable), cycle by cycle current limiting, and overheating adjustment;
· Enable feature compatibilitySupport intelligent lighting applications such as switch color adjustment and sensing control;
· ASOP8 PackageCompact structure, good heat dissipation performance, suitable for automated mounting.
2、 Key electrical parameters and performance guarantee
CXLE83180DN has excellent adaptability and stability in electrical design. It integrates a high-voltage MOSFET internally, with a breakdown voltage of 600V and a minimum on resistance of only 4.1 Ω; (EN version), suitable for wide voltage input scenarios. The working junction temperature range of the chip is -40 ℃ to 150 ℃, and it has intelligent temperature control function. When the surface temperature of the chip reaches 140 ℃, it automatically reduces the output current to achieve overheating protection.
The core electrical parameters are as follows:
· The typical value of static working current is 0.4mA, with low power consumption;
· Maximum on-time of 6&ms, maximum off time of 200&ms, rapid response;
· The peak voltage limit of the CS pin is 1.8V, with leading edge blanking (300ns) and turn off delay (200ns);
· The typical value of the internal reference voltage is 300mV, with high accuracy (3%);
· The OVP pin outputs a current of approximately 100 A and supports setting an open circuit protection voltage with an external resistor.
3、 Typical Applications and Design Guidelines
CXLE83180DN is widely used in LED bulb lights, LED tubes, and other general lighting products. Its typical application circuit is simple and flexible in design, and users can easily achieve 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 set.
Formula for setting open circuit protection voltage:
Among them, L is the inductance value (in mH), ROVP Ground resistance of OVP pin (unit: kΩ); ）. This mechanism can limit the output voltage when the LED is open circuit, protecting system safety.
4、 System protection and reliability design
The CXLE83180DN has multiple built-in 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 (about 5kHz), limiting the output current;
· open-circuit protectionSet the OVP threshold through an external resistor to avoid 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 wide, 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. Heat dissipation of HV and DRAIN pinsAppropriately increase the copper surface area to improve heat dissipation performance, but be careful to avoid introducing high-frequency interference;
5.4. CS pin layoutKeep away from high-frequency switch nodes to avoid noise coupling affecting sampling accuracy.
6、 Packaging and ordering information
CXLE83180DN adopts ASOP8 package, with compact size and clear pin definition, suitable for high-density PCB layout. The ordered model is CXLE83180XN, packaged in braided tape with 5000 pieces per plate, clearly labeled for easy production management and traceability.
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8、 Conclusion
The CXLE83180DN 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 is capable of helping products stand out 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.
