CXLE82130X is a step-down constant current driver chip that operates in critical continuous mode (BCM) of inductor current, supporting a globally applicable input voltage of 85Vac~265Vac. Its design philosophy is to maximize system integration, minimize peripheral components, and achieve the best balance of cost, volume, and reliability.
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[ CXLE82130X ]"
CXLE82130X: High performance, high integration non isolated LED constant current drive solution
With the popularization of LED lighting technology and the intense market competition, the efficiency, reliability, and cost of driving power have become the key factors determining product competitiveness. Jiatai Mu（jtm-ic.com）Launched CXLE82130X, is a constant current driver chip designed specifically for wide voltage input non isolated step-down LED lighting. It is based on itsMinimalist peripheral circuits, high-precision constant current output, and powerful protection functionsIt provides excellent core driving force for mainstream lighting products such as LED bulb lights and candle lights.
1、 Chip Overview: The Ultimate Simplified Integration Path
CXLE82130X is a product that works inInductive current critical continuous mode (BCM) The buck type constant current driver chip supports 85Vac~265Vac global universal input voltage. Its design philosophy isMaximize system integration and minimize peripheral componentsThus achieving the optimal balance between cost, volume, and reliability.
The most remarkable innovation of chips lies in theirHigh voltage JFET power supply technologyThis technology enables the chip to directly obtain the required current for operation from the high-voltage bus, therebyCompletely eliminates the essential VCC capacitor and starting resistor in traditional driving schemesThis not only simplifies PCB layout and reduces BOM costs, but also fundamentally reduces the risk of failure caused by aging electrolytic capacitors, significantly improving system lifespan and reliability.
In addition, CXLE82130X alsoBuilt in 600V ultra fast recovery diodeAs a freewheeling device, its reverse recovery time is only 35ns, effectively reducing switching losses and improving overall conversion efficiency.
2、 Core features and outstanding performance
2.1. High precision constant current output
The chip adopts closed-loop constant current control technology and is equipped with a high-precision current sampling circuit. The LED output current passes through an external sampling resistor RCS; Accurate setting, concise calculation formula:
With a precise internal reference (typical value of 373mV), CXLE82130X can achieve full voltage input and load range;± Excellent output current accuracy of 5%Ensure that each lamp has uniform brightness and meets high-quality lighting requirements.
2.2. Comprehensive system protection mechanism
To ensure stability and reliability in various abnormal situations, the chip integrates multiple protection functions:
· LED short circuit protectionWhen a short circuit occurs at the output end, the chip automatically enters a low-frequency (about 4kHz) protection mode, reducing the system power consumption to an extremely low level and ensuring safety and reliability.
· Power supply undervoltage protectionEnsure that the chip operates normally when the input voltage is abnormal.
· Overheating regulation functionWhen the surface temperature of the chip reaches140℃When adjusting the control point, the output current will be smoothly reduced to achieve temperature closed-loop control. This kind of; Soft” The protection mechanism avoids the flickering or extinguishing of lights caused by direct shutdown due to overheating, greatly improving user experience and product reliability.
2.3. Wide power coverage and flexible selection
The CXLE82130X offers seven different versions from L to D, covering a wide range of application needs from small to medium power to medium to high power through built-in power transistors with different conduction impedances (RD-SON), making it convenient for designers to make precise selections based on target power and efficiency.
*Typical working conditions reference (input voltage: 176-265Vac, chamber temperature: 60 ° C); C）*：
| version | Maximum output current | Maximum output power | Applicable scenarios |
|---|---|---|---|
| L | 100 mA | 12 W | Low power candle lights, night lights |
| M | 120 mA | 14 W | Standard bulb light (e.g. 5-7W) |
| S | 160 mA | 16 W | Mainstream bulb light (such as 7-9W) |
| A | 220 mA | 17 W | Medium power bulb lamp, tube lamp |
| B | 260 mA | 19 W | Medium to high power lighting |
| C | 310 mA | 21 W | High brightness bulb lamp, lighting fixture |
| D | 380 mA | 24 W | High power integrated LED module |
3、 Key Design Guidelines and Optimization Suggestions
3.1. Design and Selection of Energy Storage Inductors
Inductance is the core of critical mode operation. The calculation formula is:
Design keyEnsuring system shutdown time; toff Strictly adhere to the chip settingsMinimum shutdown time (1.3&ms) andMaximum shutdown time (250μ s) between. A low inductance value can cause the system to enter discontinuous mode (DCM), while a high inductance value can enter continuous mode (CCM), both of which can cause the output current to deviate from the set value and affect the constant current accuracy. Therefore, accurate calculation and selection of appropriate inductance are crucial.
3.2. The core principles of PCB layout
A good PCB layout is the foundation for ensuring performance, passing EMC testing, and optimizing heat dissipation:
· CS sampling circuitCurrent sampling resistor; RCS ofThe power ground wire must be as short and thick as possibleAnd adopt“ Star shaped; Single point groundingMethod: Connect directly to the negative terminal of the input bus capacitor. This is the lifeline to ensure the accuracy of current sampling and avoid noise interference.
· HV pin isolationThe layout of high-voltage power supply pins (HV) should be as far away as possible from low-voltage sensitive signal pins such as CS, and the auxiliary copper area should be appropriately increased to assist in the heat dissipation of built-in freewheeling diodes.
· Minimize power loopFocus on optimizing two key loops:Input capacitor - power transistor (DRAIN) - power inductorRing Road, andPower inductor freewheeling diode output capacitorRing Rd. Minimizing the physical area of these loops as much as possible is the most effective way to suppress electromagnetic interference (EMI).
· Grounding and heat dissipation optimizationThe GND pin of the chip should be directly connected to the negative terminal of the bus capacitor, rather than the output terminal of the rectifier bridge, to ensure a clean ground reference. Moderate increaseDRAINandGNDThe auxiliary copper area of the pins can effectively improve heat dissipation capability, but attention should be paid to balancing it with EMI performance.
4、 Widely applicable fields
CXLE82130X, with its high integration, high reliability, and excellent constant current characteristics, has become the ideal driving core for the following LED lighting products:
· LED bulb lightMainstream products that replace traditional incandescent and energy-saving lamps, especially suitable for standard models such as A19 and A60 that require high cost-effectiveness and long lifespan.
· LED candle lampWidely used in decorative lighting and retro lamps, its compact lamp body places higher demands on the volume and heat dissipation of the driving scheme.
· Other general LED lightingFor example, GU10 spotlights, PAR lights, tube lights, etc., while meeting safety requirements, achieve miniaturization and high efficiency of the driving power supply.
Five,Typical schematic and internal structure diagram
5.1. Typical schematic diagram
5.2. Internal structure diagram
9、 Conclusion: Innovation drives the future of green lighting
CXLE82130X is not just about Jiataimu（jtm-ic.com）The manifestation of our technological strength is our commitment to providing solutions for the lighting industryHigh value solutionsThe promise. It simplifies peripheral circuits to the extreme through innovative integrated design, significantly reducing the overall system cost while providing high-precision constant current and complete protection functions, laying a solid foundation for the excellent performance and long service life of terminal lighting fixtures.
For lighting manufacturers who pursue simple design, cost advantages, and high reliability, choosing CXLE82130X means choosing higher product competitiveness and faster market response speed. Visit Now;jtm-ic.comObtain the complete technical documentation, detailed application guide, reference design, and sample support for CXLE82130X. Let's work together with innovative semiconductor technology to drive a more efficient, energy-saving, and reliable new era of green lighting.
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The content of this article is based on the official data manual of CXLE82130X, and the technical information and design suggestions provided are for reference only. In actual product design and production, it is necessary to conduct sufficient testing, verification, and debugging based on specific application scenarios to ensure that product performance and safety reliability meet all relevant standards and requirements.
