CXLE87186 is a 6-channel LED driver chip manufactured by CMOS process, with internal integrated oscillator and PWM gray control circuit, with power-on automatic output function. Its built-in 5.5V regulator, the periphery of only a few components, greatly simplifying the system design. The chip is packaged in SOP8, which is small in size and suitable for all kinds of decorative lamps with limited space, such as meteor lights, water drop lights, advertising decoration, etc.
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[ CXLE87186 ]"
CXLE87186: highly integrated 6-channel LED meteor shower driver chip to create smart decorative lighting effects
In the field of decorative lighting, dynamic light and shadow effects have become the key to enhance the visual experience. As a fixed pattern 6-channel driver integrated circuit designed for LED meteor shower and water drop effect, CXLE87186 has become an ideal choice for indoor and outdoor decorative lighting with its high integration, simple peripheral circuit and stable PWM gray output. This article will comprehensively introduce the technical characteristics, working principle and application design of the CXLE87186, and help engineers to easily realize smart and energy-saving LED lighting effects.
First, product overview
CXLE87186 is a 6-channel LED driver chip manufactured by CMOS process, with internal integrated oscillator and PWM gray control circuit, with power-on automatic output function. Its built-in 5.5V regulator, the periphery of only a few components, greatly simplifying the system design. The chip is packaged in SOP8, which is small in size and suitable for all kinds of decorative lamps with limited space, such as meteor lights, water drop lights, advertising decoration, etc.
Second, the core characteristics
• 6-channel open-drain output: Support up to 6 LED independent control, each channel can drive 1-4 LED.
• Fixed pattern output: After power-on, it will automatically output in OUT0-OUT5 order to realize the flow effect of meteor shower or water droplets.
• PWM grayscale adjustment: Built-in PWM modulation, to achieve smooth brightness gradient, enhance the visual effect.
• Built-in oscillator and voltage regulator: Integrated 5.5V regulator, no external crystal, the system is more stable and reliable.
• Wide voltage operation2.8V-5.5V power supply range, compatible with a variety of power solutions.
• Low power design: Using CMOS process, low power consumption, suitable for battery or low-voltage power supply scenarios.
• Environmentally friendly packagingSOP8 package, suitable for automated production, in line with green manufacturing requirements.
Three, typical application scenarios
CXLE87186 widely used in the following areas of decorative lighting:
• Indoor and outdoor meteor shower LED light strip, light string
• Building facade decorative lighting, advertising signs
• Festive decorative lamps (e. g. Christmas tree lights, festive hanging lights)
• Commercial display cabinet, landscape lighting engineering
• Home decoration lights, creative lighting products
Fourth, electrical characteristics and performance parameters
Under typical conditions of VDD = 5V and ambient temperature of -15 ℃ to 85 ℃, the CXLE87186 shows the following stable performance:
• Output frequency: 170Hz-190Hz
• Single channel lighting time: 500ms-540ms
• Output TypeN tube open drain, support series LED
• Limit voltage:-0.3V to 5.5V
• Working temperature:-15 ℃ to 85 ℃
• Storage temperature:-40 ℃ to 150 ℃
Its fixed PWM output frequency and lighting time ensure the consistency of the effect, suitable for standardized mass production.
4.1. Extreme working conditions
(1) The long-term operation of the chip under the above-mentioned extreme parameter conditions may cause the reliability of the device to be reduced or permanently damaged.
It is recommended that any one of the parameters meet or exceed these limits in actual use.
(2) All voltage values are tested relative to the system ground.
4.2. Recommended working conditions
Five, function description and control logic
5.1. Power-on automatic operation
The chip starts to work immediately after power-on reset, and outputs PWM waveforms from OUT0 to OUT5 in turn, forming a continuous "meteor" or "water drop" flow effect without external controller intervention.
5.2. Output drive capability
Each output is an open-drain structure, which can be connected in series with 1-4 LEDs (the total voltage drop of LEDs is recommended to be> 3V). If a low-voltage drop LED (such as a single red LED) is used, an external current limiting resistor (2Ω is recommended) is required to protect the LED and the chip.
5.3. Grayscale control mechanism.
Through the internal PWM modulation to achieve brightness gradient, so that the LED in the lighting and extinguishing process presents a smooth transition, enhance the natural sense of visual effects.
Sixth, design guidelines and peripheral circuits
6.1. Typical application circuit
• High Voltage Drop LED SeriesAs shown in Figure 3, each channel is directly connected with 1-4 LEDs (such as white light and blue light LEDs) without external resistors.
• Low voltage drop LED applications: As shown in Figure 4, if you use low-voltage drop LEDs such as red light, you need to connect a 2Ω current limiting resistor in series.
6.2. Power Supply Design Recommendations
• It is recommended to connect a 0.1μF ceramic capacitor in parallel between VDD and GND to enhance power supply stability.
• If the input voltage is higher than 5.5V, it is recommended that the external regulator circuit or series resistor divider.
6.3. Output cabling recommendations
• The output line should be short and thick to reduce voltage drop and interference.
• If driving long-line LED, it is recommended to install a buffer circuit at the output to prevent voltage oscillation.
6.4. Internal structure block diagram
Seven, layout and heat dissipation recommendations
• The chip should be arranged as close as possible to the LED load to shorten the drive circuit.
• The heat dissipation of SOP8 package mainly depends on the connection between pins and PCB. It is recommended to lay a grounding copper sheet at the bottom of the chip to enhance heat dissipation.
• When used in high temperature or high humidity environments, it is recommended to treat the PCB with moisture.
Eight, packaging and supply information
The CXLE87186 is packaged in standard SOP8 with a size of 4.7 × 5.1mm and a pin spacing of 1.27mm, which is suitable for automatic placement and large-scale production. Product performance is stable, reliable quality, has been widely used in all kinds of decorative lighting market.
Nine, the conclusion
CXLE87186 with its high integration, fixed meteor shower effect, simple peripheral circuit and excellent PWM gray control, become the preferred solution in the field of decorative LED driver. Whether in holiday lighting, architectural lighting or home decoration, its stable performance and excellent visual effects can meet the dual needs of users for beauty and reliability. For detailed data sheets, application samples or further technical support, please visitJTM-IC official websiteQuery.
