CXLE83183B is a non isolated buck LED driver chip that integrates active power factor correction (PFC) and high-precision constant current control. The chip operates in critical conduction mode (CrM), significantly reducing switching losses and optimizing electromagnetic interference (EMI), making it suitable for general power supply design. It integrates rectifier bridge, freewheeling diode, VCC and COMP capacitors internally, greatly simplifying peripheral circuits, reducing system costs and board space.
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[ CXLE83183B ]"
In modern lighting systems, LED has become the mainstream choice due to its high efficiency, energy saving, and long lifespan characteristics. The performance of LED drivers directly determines the stability and energy efficiency of the entire lighting system. In response to this demand, JTM-IC has launchedCXLE83183B The high-precision non isolated buck PFC LED driver chip has become a highly integrated solution that has attracted much attention in the market.
1、 Chip Overview
CXLE83183B is a non isolated buck LED driver chip that integrates active power factor correction (PFC) and high-precision constant current control. The chip operates in critical conduction mode (CrM), significantly reducing switching losses and optimizing electromagnetic interference (EMI), making it suitable for general power supply design. It integrates rectifier bridge, freewheeling diode, VCC and COMP capacitors internally, greatly simplifying peripheral circuits, reducing system costs and board space.
2、 Core Features
· High power factor (PF& 0.7)Built in active PFC circuit to improve grid utilization efficiency and meet energy regulatory requirements.
· Highly integrated designIntegrated 800V rectifier bridge and 600V ultrafast recovery diode, eliminating the need for external VCC and COMP capacitors, resulting in a simpler system structure.
· Accurate constant current controlAdopting unique current sampling technology, high-precision output current is achieved through external sampling resistors, with excellent linearity and load adjustment rate.
· Comprehensive protection mechanismEquipped with LED short-circuit protection, cycle by cycle current limitation, and overheating regulation functions, the system reliability is significantly enhanced.
· package formAdopting ASOP7 packaging, it has good heat dissipation performance and is suitable for compact application scenarios.
3、 Typical application areas
CXLE83183B is widely applicable to various LED lighting products, including but not limited to:
· LED bulb light
· LED tube light
· Other general LED lighting equipment
4、 Working principle and performance advantages
The chip operates in the critical continuous mode of inductor current, and real-time samples the current signal through the CS pin, compares it with the internal precision reference voltage, and achieves closed-loop constant current control. When the system temperature is too high, the chip automatically activates the overheat regulation function, gradually reducing the output current to control the temperature rise and ensure that the system continues to operate within a safe temperature range.
In terms of protection, CXLE83183B has multiple protections:
· short circuit protectionWhen the output is short circuited, the chip switches to a low-frequency working mode (about 3kHz) to avoid device overload.
· Cycle by cycle current limitingWhen the CS voltage exceeds the internal threshold (1.3V), immediately turn off the power MOS transistor to effectively protect the power inductor, freewheeling diode, and MOS transistor itself.
5、 Key electrical parameters
Under typical working conditions (HV=100V, TA=25 ℃):
· Working current: Typical value 0.6mA
· Maximum conduction time: 20&ms
· CS peak voltage limit: 1.3V
· Overheating regulation trigger temperature: 140 ℃ (chip surface)
· Breakdown voltage of freewheeling diode: 600V
· MOSFET breakdown voltage: 500V
6、 PCB design suggestions
To ensure system stability and low EMI, attention should be paid to the following during layout:
6.1. Ground wire treatmentThe auxiliary copper area of the GND pin should be as large as possible, and the power ground of the current sampling resistor should be short and thick.
6.2. Power Loop OptimizationReduce the area of high current loop and minimize radiation interference.
6.3. Heat dissipation enhancementThe auxiliary copper of HV and DRAIN pins should be sufficient to enhance heat dissipation capability.
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8、 Conclusion
CXLE83183B is an ideal choice for LED lighting driver design due to its high integration, high power factor, precise constant current, and comprehensive protection functions. JTM-IC is committed to providing high-performance and highly reliable power management solutions, helping customers achieve product innovation and efficiency improvement in the field of energy-efficient lighting.
For more technical information, application notes, and procurement information about CXLE83183B, please visit the JTM-IC official website;jtm-ic.comObtain professional support and complete solutions.
