CXLE87119 is a three-channel LED driver chip based on patented constant current control technology. The input voltage range is 5 ~ 40Vdc, and the maximum output current of a single channel is 150mA. The chip integrates a high-voltage drive module, a PWM dimming module, an over-temperature protection module and a precise constant current control circuit, with a constant current inflection point voltage as low as 1.2V, which can achieve high-efficiency constant current output under low dropout conditions.
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[ CXLE87119 ]"
CXLE87119 three-channel LED constant current driver chip: high-precision dimming and multi-scene application full analysis
In the field of LED decorative lighting and building lighting, multi-channel, high-precision, dimmable constant current driver chip has become the core component to achieve complex lighting effects and intelligent control. As a three-channel high-precision LED constant current driver chip introduced by Jiatem Electronics (JTM-IC), CXLE87119 is widely used in wall washer, line lamp, building facade lighting and other scenes by virtue of its patented constant current technology, wide voltage input and flexible PWM dimming capability. This article provides an in-depth analysis of the technical characteristics of the CXLE87119, system design points and typical applications, providing a complete reference guide for lighting designers and engineers.
1. product overview and technical positioning
CXLE87119 is a three-channel LED driver chip based on patented constant current control technology. The input voltage range is 5 ~ 40Vdc, and the maximum output current of a single channel is 150mA. The chip integrates a high-voltage drive module, a PWM dimming module, an over-temperature protection module and a precise constant current control circuit, with a constant current inflection point voltage as low as 1.2V, which can achieve high-efficiency constant current output under low dropout conditions.
The chip supports an external resistor to set the output current in the range of 20mA ~ 150mA. The on-chip output current deviation is less than 4%, and the on-chip deviation is less than 5%. It has excellent current consistency and temperature stability. Its ESOP8 package structure takes into account both heat dissipation performance and welding process adaptability, and is suitable for high-density, high-reliability LED module design.
2. core features and technical advantages
1. Patented constant current control technology
The chip uses an autonomous constant current control architecture to achieve accurate current output under low dropout conditions. As shown in the chart, when the OUT port voltage (VDS) exceeds the constant current inflection point, the output current is very little affected by voltage fluctuations, ensuring stable LED brightness.
2. Three-channel independent output
The three channels of OUT1/2/3 can be controlled independently, and support the parallel use of multiple LED lights, which is suitable for complex lighting scenes such as RGB light mixing and segmented dimming. Users can also use three channels in parallel to achieve a maximum of 450mA expanded current output.
3. High precision PWM dimming
PWM signal input via the DIM pin enables dimming frequencies of up to 100kHz with a response delay of less than 200ns. The dimming process is smooth and flicker-free, and the duty cycle directly controls the output current ratio to meet the needs of high-end architectural lighting for delicate light color control.
4. Comprehensive system protection
• Over temperature protection (OTP): When the chip junction temperature exceeds 140 ℃, the negative temperature compensation mechanism is automatically activated to gradually reduce the output current to prevent overheating damage.
• High withstand voltage output: OUT port withstand voltage up to 40V, adapt to a variety of LED string configuration.
• ESD ProtectionHBM mode electrostatic protection capacity of more than 3kV, improve the reliability of production and use.
3. key electrical parameters and performance
The main parameters of the CXLE87119 under typical operating conditions (VDD = 5V,TA = 25 ℃) are as follows:
• Input voltage range：5V~40V
• Single channel output current：20mA~150mA
• Constant current inflection point voltage：0.5V（@20mA）~1.2V（@150mA）
• REXT Port Voltage: 1.23V (typical)
• Quiescent current：0.4mA
• Dimming response time：<200ns
• Thermal resistance (R & theta;JA):65℃/W
Guide to 4. System Design and Application
1. Output current setting
The output current is set by an external REXT resistor, and the calculation formula is:
The user can select the appropriate resistance according to the target current value. For example, when setting 60mA output, REXT is about 3.9 kΩ.
2. Power supply design and current limiting resistor
The VDD pin of the chip needs to be externally connected with a current limiting resistor RD, and its value affects the power consumption and anti-interference ability of the system. It is recommended to refer to the following table for selection:
| Input power supply VCC | RD Recommended Value |
|---|---|
| 12V | 2kΩ |
| 15V | 3kΩ |
| 24V | 5kΩ |
3. Output voltage divider resistor design
In order to control the power consumption and temperature rise of the chip, the OUT port needs to be connected in series with a voltage divider resistor RL, which is calculated as follows:
It is recommended that VDS be set between 1.8V and 3.0V to balance power consumption and system stability.
4. PCB Layout Recommendations
• Heat dissipation design: The chip substrate should be connected to the underlying copper foil through multiple vias to make full use of PCB heat dissipation.
• signal isolation: DIM dimming signal line should be far away from the power loop to prevent noise coupling.
• Capacitance Configuration: The power supply filter capacitor CS is recommended to be 4.7~470 μF, and the chip filter capacitor CD is 100nF.
5. typical application scenarios
With its multi-channel, high-precision and flexible dimming characteristics, the CXLE87119 is widely used in the following scenarios:
1. Architectural contour lighting and wall washer
Multi-channel independent control supports dynamic color change and brightness adjustment to meet the complex needs of building facades, bridges, and landscape lighting.
2. LED line lamp and decorative strip
High constant current accuracy to ensure uniform brightness of long-distance lights, PWM dimming to achieve stepless brightness adjustment, suitable for commercial space and home decoration lighting.
3. Intelligent lighting system
Cooperate with microcontroller or intelligent dimmer to realize scene lighting control, suitable for hotel, exhibition hall, stage lighting and other occasions.
4. High density LED module
Three-channel parallel expansion capability supports high current output, suitable for high brightness, high power LED module driver.
6. epilogue
As a high-performance, multi-channel LED constant current driver chip, CXLE87119 provides a reliable and efficient driving solution for modern LED lighting system with its patented constant current technology, high-precision output, flexible dimming ability and comprehensive protection mechanism. Whether it is a complex building lighting project or exquisite interior decoration lighting, the chip can help designers achieve precise optical control and stable system performance.
For CXLE87119 samples, technical documentation or application support, please visitJTM-IC official websiteOr contact our technical support team. Jiatem Electronics (JTM-IC) has always been committed to providing customers around the world with high-quality, high-reliability power management IC products and system solutions to help you achieve the perfect lighting ideas.
