The CXLE87143D integrates MCU single-wire digital interface, data latch, LED constant current drive and PWM brightness control circuit, and supports multi-chip cascade connection through single-wire interface (DI/DO). The external controller only needs one signal line to realize the unified control of multiple chips, which greatly simplifies the system wiring and hardware design. Chip built-in 5V regulator, support 6~24V wide voltage input, suitable for a variety of power environment.
-
[ CXLE87143D ]"
In LED lighting and control systems, high efficiency,StableThe driver chip is the key to ensure the overall performance.CXLE87143D as a six/nine channel optional LED fixedConstant current driveSpecial control circuit, with its excellent integration and flexible communication mode, has become an ideal choice for many LED display, decorative lighting and intelligent lighting projects. This article will analyze the technical characteristics, application scenarios and design points of the chip in depth to help engineers better apply it to actual projects.
1. Chip Overview
CXLE87143D Internal Integrated MCU Single Wire Digital Interface, Data Latch, LEDConstant current driveAnd PWM brightness control circuit, support through the single wire interface (DI/DO) to achieve multi-chip cascade. The external controller only needs one signal line to realize the unified control of multiple chips, which greatly simplifies the system wiring and hardware design. Chip built-in 5V regulator, support 6~24VWide voltage inputSuitable for a variety of power supply environments.
2. core features
• Six/nine channels optional: Through SET pin setting, 6-channel or 9-channel output mode can be realized, which can flexibly cope with different application scenarios.
• Fixed constant current output: The output current of each channel is fixed at 17mA, which has high consistency and effectively guarantees uniform LED brightness.
• 256 levelPWM Dimming: Support fine brightness adjustment to meet diverse visual needs.
• Single-wire serial cascadeSupport automatic shaping forwarding technology, signal transmissionStableThe number of cascading is theoretically unlimited.
• High refresh rate and transfer rate: The data transmission rate is up to 800Kbps, and the refresh rate can support 1024-point cascade at 30fps.
• Wide pressure operation with built-in voltage regulator: VDD built-in 5V regulator, the peripheral circuit is simple, the system reliability is high.
3. electrical characteristics and encapsulation
CXLE87143D has excellent electrical performance:
• The output port withstand voltage is 24V, and the constant current precision is high (the error between channels is ± 2.5%).
• Operating temperature range -40 ℃ to 85 ℃, adapt to harsh environment.
• SOP14 and DIP 700.00g packages are available for different installation needs.
4. Application Design Guide
4.1. Cascade and refresh rate calculations.
The chip supports multi-level cascading, and the refresh rate is related to the number of pixels. For example, at 800Kbps, the system refresh rate of 2000 pixel is about 17Hz, which meets most dynamic display requirements.
4.2. Power Supply Configuration and Resistance Selection
Depending on the supply voltage (DC), appropriate resistors need to be connected in series before the VDD pin to protect the chip.StableWork. For example:
• 24V power supply is recommended to connect 1.8kΩ resistors in series.
4.3. Constant current output optimization
In order to ensure that the chip works in the best constant current state, the OUT port voltage is recommended to be controlled between 1.2V and 3V. Can be adjusted by series resistance, the formula is as follows:
For example, a 24V system drives 6 LEDs (each with a voltage drop of 2V). When the constant current is 17mA, the series resistance is about 525 Ω.
4.4. Expanding the flow scheme.
For larger drive currents, multiple OUT ports can be used in parallel. For each parallel connection, the maximum output current increases by 17mA, and the maximum output current of three parallel connections can reach 51mA, which is suitable for high-brightness LED driving scenarios.
5. typicalapplication circuit
CXLE87143D can be widely used in LED display, landscape lighting, smart home lighting and other fields. Its single-line cascade characteristics are particularly suitable for long-distance, multi-node LED control system design. In the design, the shielding of the signal line and the decoupling of the power supply should be paid attention to to improve the anti-interference ability of the system.
6. package and pin function
SevenConclusion
CXLE87143D with its high integration, flexible channel configuration,StableThe constant current output and simple cascade method have become the preferred chip in the LED driver field. Whether it is a large display or a fine dimming system, it can provide reliable hardware support. JTMIC (jtm-ic.com) as the official of the chipTechnical Supportand suppliers, is committed to providing customers with complete technical solutions and quality service guarantee.
For more technical details,Sample ApplicationOr bulk purchase information, welcome to visit JTMIC official website or contact us.Technical SupportTeam.
Eight,Related Chip Selection Guide Download
