CXLE82134FK is a high-performance constant current driver chip suitable for non-isolated step-down LED power supply. It supports 85Vac to 265Vac full range input voltage and is widely used in various LED lighting systems. The chip uses inductor current critical continuous mode, integrates 500V high voltage power switch internally, combines unique demagnetization detection technology and high voltage JFETs power supply architecture, without external VCC capacitor and starting resistor, it significantly simplifies the peripheral circuit design and reduces the system cost and volume.
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[ CXLE82134FK ]"
CXLE82134FK high precision step-down LED constant current driver chip-JTM-IC intelligent dimming lighting solution
With the gradual development of LED lighting system towards intelligence and high efficiency, the market demand for LED driver chips with high integration, high reliability and supporting intelligent control is increasing day by day. JTM-IC (jtm-ic.com) the CXLE82134FK high-precision step-down LED constant current driver chip is an advanced solution designed to meet this trend. This paper will comprehensively analyze the technical characteristics, working principle, design key points of the chip and its application value in intelligent lighting system.
I. Overview of CXLE82134FK chips
CXLE82134FK is a high-performance constant current driver chip suitable for non-isolated step-down LED power supply. It supports 85Vac to 265Vac full range input voltage and is widely used in various LED lighting systems. The chip uses inductor current critical continuous mode, integrates 500V high voltage power switch internally, combines unique demagnetization detection technology and high voltage JFETs power supply architecture, without external VCC capacitor and starting resistor, it significantly simplifies the peripheral circuit design and reduces the system cost and volume.
The chip has built-in high-precision current sampling and constant current control circuit, and the output current accuracy reaches ± 5%, with excellent line voltage and load adjustment rate. Its Enable function is compatible with switch color adjustment and induction lamp control, and is suitable for intelligent and scenario-based lighting applications.
II. Core features and technical advantages
· Intelligent control support: The Enable function can be adapted to intelligent lighting systems such as switch color mixing and human body induction to improve system flexibility.
· Highly integrated design: internally integrated high-voltage power tube and JFETs power supply, without auxiliary power supply devices, the system structure is simple.
· Wide voltage input: 85Vac ~ 265Vac global universal input, suitable for a variety of grid environments.
· High precision constant current: ± 5% output current accuracy to ensure LED brightness consistency and long-term stability.
· Multiple protection mechanisms: Built-in LED short circuit protection and overheating regulation function to improve system reliability.
· Compact package: it adopts ESSOP6 package and is suitable for lighting design with compact space.
III. Internal structure and working principle
CXLE82134FK integrates Vcc power supply module, Undervoltage protection, overheating regulation, constant current control, front-edge blanking, current detection and other functional units. After the system is powered on, the bus voltage supplies power to the inside of the chip through the HV pin, and the control circuit starts to work after reaching the start threshold. The chip realizes closed-loop constant current control by detecting the peak current of inductor cycle by cycle. The CS pin is connected with an external sampling resistor and controls the switching state of power tube compared with the internal 373mV threshold.
The output current is determined by the following formula:
RCS is an external current sampling resistor, which can be flexibly selected according to actual output current requirements.
3.1. Working principle
3.2. Internal structure
IV. Design and frequency characteristics of energy storage inductance
The chip works in critical conduction mode, and the operating frequency of the system increases with the increase of input voltage. The choice of inductance value is crucial to the stability and efficiency of the system, and its calculation formula is as follows:
In order to ensure that the system always works in critical mode, the shutdown time should be between the minimum demagnetization time (1.7 μs) and the maximum demagnetization time (250 μs) set by the chip, avoid entering intermittent or continuous mode to affect constant current accuracy.
V. Intelligent Enable function and application
CXLE82134FK supports the start and stop of the chip through external signals, which is suitable for intelligent control scenarios such as color temperature adjustment, scene lighting, and human body induction. The Enable function not only makes the chip suitable for traditional lighting, but also seamlessly connects to smart home and Internet of Things lighting systems to enhance the added value and market competitiveness of products.
Analysis of 6. Multiple Protection Mechanism
CXLE82134FK has complete system protection functions to ensure safe operation in various abnormal situations:
· LED short circuit protection: when the output is short-circuited, the system automatically switches to 4kHz low-frequency operation mode, with extremely low power consumption, avoiding device damage.
· Overheating adjustment function: when the surface temperature of the chip exceeds 120℃, the output current will be automatically reduced to realize closed-loop temperature control, prevent overheating and damage, and improve the long-term reliability of the system.
VII. PCB Layout Design Guide
Good PCB design is the key to ensure system stability, heat dissipation performance and EMI compliance:
7.1. CS sampling resistor: The current sampling ground wire should be short and thick, independent routing to the bus capacitor ground, CS pin auxiliary copper can enhance heat dissipation.
7.2. HV pin: keep away from CS and other low voltage signal pins to prevent noise interference and coupling.
7.3. Power loop: reduce the Loop area between power inductor, Power Tube, bus capacitor, flyback diode and output capacitor as much as possible to reduce EMI radiation.
7.4. DRAIN pin: increase the copper laying area appropriately to improve the heat dissipation capacity, but pay attention to avoid negative impact on EMI performance.
8. Typical application scenarios
CXLE82134FK is widely applicable to all kinds of non-isolated LED lighting systems, especially suitable for the following application scenarios:
·LED candle light, bulb and other home lighting products
·Commercial Lighting systems such as downlights and panel lights
·Intelligent lamps supporting color mixing and human body induction
·Other LED driver solutions requiring high reliability, high integration and intelligent control
IX. Package and pin functions and ordering information
CXLE82134FK adopts ESSOP6 package, compact structure, good heat dissipation, suitable for small and medium power LED driving applications. The order model is CXLE82134FK, and the package is in the form of braiding, 5000 pieces per plate, which is convenient for automatic production and supply chain management.
For more technical parameters, application plans, and sample application information, visit the official website JTM-IC:jtm-ic.com.
X. Electrical performance
Xi,Related productsmore...
12. Conclusion
CXLE82134FK has become an ideal driving choice for small and medium power intelligent LED lighting due to its high precision stable output current, high integration design, intelligent Enable control and comprehensive system protection. JTM-IC has always been committed to providing high-performance and high-reliability power management chip solutions for the global lighting industry, promoting the sustainable development of LED technology in the direction of smarter, more energy-saving and more reliable.
This article is provided by the JTM-IC technical team. For reprinting, please specify the source fromjtm-ic.com.
