CXLE83184CR is a non isolated buck LED driver chip that integrates active power factor correction (PFC) and high-precision constant current control. This chip adopts critical conduction mode (CrM), effectively reducing switching losses and optimizing electromagnetic interference (EMI), suitable for a wide input voltage range of 85V-265V. It integrates an 800V rectifier bridge, 600V ultrafast recovery diode, and VCC/COMP capacitor internally, greatly simplifying peripheral circuits, reducing the number of components, and lowering system costs and board area.
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[ CXLE83184CR ]"
In today's rapidly developing LED lighting technology, efficient, stable, and reliable driver chips are the core to ensure the performance of lighting systems. JTM-IC has launchedCXLE83184CRThe high-precision non isolated buck PFC LED driver chip, with its high integration, excellent energy efficiency, and multiple protection functions, has become an ideal choice for various general lighting applications. This article will provide an in-depth analysis of the technical features, working principles, application design, and advantages of CXLE83184CR, to assist engineers in creating higher performance LED lighting solutions.
1、 Chip Overview: Born for Efficient Lighting
CXLE83184CR is a non isolated buck LED driver chip that integrates active power factor correction (PFC) and high-precision constant current control. This chip adopts critical conduction mode (CrM), effectively reducing switching losses and optimizing electromagnetic interference (EMI), suitable for a wide input voltage range of 85V-265V. It integrates an 800V rectifier bridge, 600V ultrafast recovery diode, and VCC/COMP capacitor internally, greatly simplifying peripheral circuits, reducing the number of components, and lowering system costs and board area.
2、 Core feature: Perfect combination of performance and reliability
2.1. High power factor (PF≥ 0.7)Built in active PFC circuit to improve grid utilization and comply with global energy efficiency standards.
2.2. Fully integrated designNo need for external VCC and COMP capacitors, integrated rectifier bridge and freewheeling diode, simple and reliable system structure.
2.3. Accurate constant current outputUsing patented current sampling technology, external sampling resistors are used to achieve± Output current accuracy within 3%, with excellent linearity and load adjustment rate.
2.4. Comprehensive protection mechanismIncluding LED short circuit protection, cycle by cycle current limiting, and overheating regulation functions, ensuring the safe operation of the system under various abnormal conditions.
2.5. Efficient heat dissipation packagingAdopting ASOP7 packaging, it has low thermal resistance and excellent heat dissipation performance, suitable for high power density applications.
3、 Typical application areas
CXLE83184CR is widely applicable to various LED lighting products, including:
· LED bulb light
· LED tube light
· General lighting equipment such as tube lights and panel lights
4、 Technical details and electrical parameters
Under typical working conditions (HV=100V, TA=25 ° C), the key parameters of CXLE83184CR are as follows:
· operating currentTypical value of 0.6mA, low static power consumption.
· time controlThe maximum conduction time is 20 seconds, the minimum turn off time is 1.8 seconds, and the maximum turn off time is 260 seconds.
· current samplingCS peak voltage limit is 1.3V, leading edge blanking time is 300ns, and the typical internal reference voltage is 300mV.
· freewheeling diodeThe breakdown voltage is 600V, the maximum average current is 0.5A, and the recovery time is only 35ns.
· Power MOSFETThe on resistance is as low as 5.8Ω The breakdown voltage is 500V and the leakage current is less than 1A.
· Overheating regulationTrigger temperature 140 ° C; C (chip surface), automatically adjusts output current to control temperature rise.
5、 Deep analysis of working principle
5.1. startup processAfter power on, the bus voltage supplies power to the chip through the HV pin. When the voltage reaches the turn-on threshold, the chip's soft start mechanism is activated, and the output voltage gradually increases to avoid current overshoot.
5.2. Constant current controlThe chip samples the current signal in real-time through the CS pin, compares it with the internal high-precision reference voltage (VREF), dynamically adjusts the switch duty cycle, and achieves closed-loop constant current control. The formula for calculating output current is:
Among them, Rcs is the external sampling resistor value, which is designed flexibly.
5.3. Overheating regulationWhen the temperature of the chip exceeds the set threshold, the built-in thermal regulation circuit gradually reduces the output current, controls power loss, and stabilizes the temperature within a safe range.
5.4. protection function：
· short circuit protectionWhen the output short circuit occurs, the chip automatically switches to low-frequency mode (about 3kHz) to limit the short-circuit current.
· Cycle by cycle current limitingWhen the CS voltage exceeds 1.3V, immediately turn off the power MOSFET to protect the power inductor, freewheeling diode, and MOSFET itself.
6、 Key suggestions for PCB design
To ensure system stability, low EMI, and efficient heat dissipation, attention should be paid to the following during layout:
6.1. Ground wire designThe auxiliary copper area of the GND pin should be maximized, and the power ground of the current sampling resistor should be short and thick to reduce noise interference.
6.2. Power Loop OptimizationReduce the area of high current loops (such as input filtering and switch nodes) and lower radiated EMI.
6.3. Heat dissipation treatmentThe auxiliary copper area of HV and DRAIN pins should be sufficient and connected to the heat dissipation layer as much as possible to enhance the overall heat dissipation capability.
6.4. signal isolationSensitive signal lines (such as CS wiring) should be kept away from high-voltage switch nodes to avoid coupling noise.
7、 Encapsulation Information (ASOP7)
The CXLE83184CR is packaged in ASOP7 and has a compact size (typical value 6.2mm×); 3.9mm）， Pin spacing of 0.4mm, suitable for automated mounting. Please refer to the official data manual for detailed mechanical dimensions.
8、 Why choose CXLE83184CR?
· high integrationReduce external components, lower BOM costs and board difficulty.
· high energy efficiencyThe combination of critical conduction mode and active PFC can achieve a system efficiency of over 90%.
· high reliabilityMultiple protection mechanisms and overheating regulation function extend the lifespan of the system.
· Flexible designExternal sampling resistor supports custom current and adapts to various LED series and parallel requirements.
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10、 Conclusion
CXLE83184CR provides high-performance solutions for LED lighting drivers with its high precision, integration, and reliability. JTM-IC has always been committed to innovation in power management technology, providing customers with comprehensive support from chips to applications. For more technical information, reference designs, or procurement information about CXLE83184CR, please visit our official website;jtm-ic.comObtain professional services and complete solutions to jointly promote the development of green lighting technology.
