CXLE82133PN is a high-performance driver chip designed for non-isolated step-down constant-current LED power supply. It supports a full range of input voltage from 85Vac to 265Vac and is suitable for all kinds of LED lighting applications around the world. The chip adopts inductive current critical continuous mode, integrates 500V power switch internally, combines unique demagnetization detection technology and high-voltage JFETs power supply technology, without external VCC capacitor and starting resistor, greatly simplifies peripheral circuit, reduce cost and volume.
-
[ CXLE82133FN ]"
CXLE82133FN high-precision step-down LED driver chip analysis-JTM-IC intelligent lighting driver solution
Today, LED lighting systems tend to be intelligent and highly reliable, a driver chip with strong anti-interference capability, supporting external OVP and intelligent enabling control is particularly important. JTM-IC (jtm-ic.com) the CXLE82133FN high-precision step-down LED constant current driver chip is an integrated solution designed to meet this market demand. This article will systematically explain the chip performance, working mechanism, design points and typical applications, helping engineers to build a more stable and intelligent LED lighting system.
I. Overview of CXLE82133FN chips
CXLE82133FN is a high-performance driver chip designed for non-isolated step-down constant-current LED power supply. It supports a full range of input voltage from 85Vac to 265Vac and is suitable for all kinds of LED lighting applications around the world. The chip adopts inductive current critical continuous mode, integrates 500V power switch internally, combines unique demagnetization detection technology and high-voltage JFETs power supply technology, without external VCC capacitor and starting resistor, greatly simplifies peripheral circuit, reduce cost and volume.
The chip has built-in high-precision current sampling circuit, the output current accuracy is ± 5%, and it has excellent line voltage and load adjustment rate. The ROVP pin has both open circuit protection voltage setting and Enable control functions, which is especially suitable for intelligent lighting systems such as switch color mixing and human body induction, and has strong anti-interference capability.
II. Core features and technical advantages
· Strong anti-interference OVP design: the external OVP circuit has strong anti-interference ability, and the system still works stably in complex electromagnetic environment.
· Intelligent enable control: ROVP supports the Enable function. The chip starts when the voltage is higher than 0.3V, and turns off when the voltage is lower than 0.1V. It is suitable for scenarios such as dimming and induction control.
· Highly integrated design: internally integrated high-voltage power tube and JFET power supply, without auxiliary power supply components.
· Wide input voltage: 85Vac ~ 265Vac global universal input, suitable for a variety of grid environments.
· Precision stable output current: ± 5% output current accuracy to ensure LED brightness consistency.
· Comprehensive protection mechanism: supports multiple protection such as LED short circuit/open circuit protection and chip overheating adjustment.
· Good heat dissipation package: HSOP-7 package, excellent heat dissipation performance, support higher power output.
III. Internal structure and working principle
CXLE82133FN integrates Vcc power supply, Undervoltage protection, OVP control, overheating regulation, constant current logic, leading edge blanking, current detection and other modules. After the system is powered on, the bus voltage supplies power to the chip through the HV pin, and the control circuit works after reaching the start threshold. The chip realizes constant current control by detecting the peak current of the inductor cycle by cycle. The CS pin is connected with an external sampling resistor, which controls power tube on-off compared with the internal 373mV threshold.
The output current is determined by the following formula:
The RCS is an external current sampling resistor with flexible design, which is convenient to adjust the output current.
3.1. Working principle
3.2. Internal structure
IV. Design of energy storage inductance and system frequency control
The chip works in critical conduction mode, and the system frequency varies proportional to the input voltage. The choice of inductance value directly affects the stability of the system. The 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 (400 μs) set by the chip, avoid entering intermittent or continuous mode and affecting the output current accuracy.
V. External OVP function and resistance setting
CXLE82133FN the open circuit protection voltage can be set through the external resistor of the ROVP pin, and the output current of the ROVP pin is about 95μa. The relationship between open circuit protection voltage and demagnetization time can be estimated by the following formula:
Then calculate the ROVP resistance value:
ROVP pin has the Enable function, which is suitable for applications such as intelligent color mixing and inductive switch. If the OVP function is not required, the pin can be suspended.
VI. Detailed explanation of multiple protection mechanisms
CXLE82133FN provides comprehensive system protection functions to ensure safe operation under various abnormal conditions:
· LED short circuit protection: when the output is short-circuited, the system automatically enters the 4kHz low-frequency working mode with extremely low power consumption.
· LED open circuit protection: with external OVP resistor, adjustable open circuit protection voltage can be realized.
· Overheating adjustment function: When the chip temperature exceeds 140℃, the output current is automatically reduced to realize temperature control closed loop and improve the long-term reliability of the system.
VII. PCB Layout Design Guide
Good PCB layout is crucial to system stability, heat dissipation and EMI performance:
7.1. CS sampling resistor: The Power ground wire should be short and thick, and be independently routed 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.
7.3. Power loop: minimize the Loop area between power inductor, Power Tube, bus capacitor and flyback diode, and output capacitor to reduce EMI radiation.
7.4. ROVP pin: The OVP resistor should be close to the chip pin, and the routing is far away from high voltage and noise sources.
7.5. DRAIN pin: increase the copper laying area appropriately to improve the heat dissipation performance.
8. Typical application scenarios
CXLE82133FN is widely applicable to all kinds of non-isolated LED lighting systems, especially suitable for the following applications:
·LED candle light, bulb and other home lighting products
·Commercial Lighting systems such as downlights and panel lights
·Intelligent lamps supporting color temperature adjustment and human body induction
·Other LED driving solutions requiring high reliability, external OVP and intelligent control
IX. Package and pin functions and ordering information
CXLE82133FN is packaged with HSOP-7, which has good heat dissipation performance and is suitable for medium power LED driving applications. The order model is CXLE82133FN, and the package is in the form of Reel, 5000 pieces per plate, which is convenient for mass production and supply. For more technical information, application plans and sample applications, visit the official website JTM-IC:jtm-ic.com.
X. Electrical characteristics
Xi. Conclusion
CXLE82133FN is an ideal choice for high-power LED intelligent lighting drive due to its high precision stable output current, strong anti-interference OVP design, flexible Enable control function and comprehensive system protection. JTM-IC will continue to devote itself to providing high-performance and high-reliability power management chips for the lighting industry, and promote the continuous development of LED lighting in the direction of intelligence, high reliability and green energy conservation.
12. Related productsmore...
This article was compiled and published by the JTM-IC technical team. Please specify the source fromjtm-ic.com.
