CXLE87133ACE is a three-channel high-precision constant current driver chip based on DMX512 differential parallel protocol. Different from the conventional driver chip, it is specially optimized for human visual perception characteristics, and uses enhanced gamma 2.2 correction technology to increase the 256-level input grayscale to the 65536-level (16-bit) output, achieving an extremely smooth color transition. Its compact SSOP10 package is particularly suitable for space-constrained RGB luminaire designs.
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[ CXLE87133ACE ]"
CXLE87133ACE: DMX512 three-channel LED driver chip optimized for visual experience
In the field of professional lighting, accurate color reproduction and smooth grayscale transition are key indicators to measure system performance. As a three-channel DMX512 driver chip deeply optimized for human visual characteristics, CXLE87133ACE provides an industry-leading visual experience for high-end lighting projects through enhanced gamma correction technology and excellent electrical performance. This article will fully introduce the technical characteristics and innovative design of this product.
1. product positioning: three-channel solution focusing on visual experience
CXLE87133ACE is a three-channel high-precision constant current driver chip based on DMX512 differential parallel protocol. Unlike conventional driver chips, it is specifically designedhuman visual perception characteristicsoptimized, usingEnhanced gamma 2.2 correctiontechnology to boost the 256-level input grayscale65536 level (16 bits)Output, achieving extremely smooth color transitions. its compactSSOP10 PackageEspecially suitable for space limited RGB lighting design.
2. Core Technology Highlights: Why It Provides a Superior Visual Experience
2.1. Enhanced gamma 2.2 correction technology.
• The enhanced gamma correction curve is integrated inside the chip, and its output turn-on time is designed:Grayscale time after correction of basic turn-on time.
• This uniqueBasic turn-on time (about 85ns)Effectively compensates for the turn-on delay in the actual circuit, especially when matched with high-power constant current drive IC with different response speeds, it can ensure thatThe first level of gray is clearly perceived by the human eye, Completely solve the "dead zone" problem in low grayscale and high power applications.
2.2. High precision three channel constant current output
• Provide R, G, B three independent constant current output, current range3mA to 80mAIt is precisely set by a single external resistor (REXT).
• Excellent current consistency: channel-to-channel differences<±3%, chip-to-chip differences<±3%Lay the foundation for accurate white balance and color consistency.
2.3. Comprehensive DMX512 protocol compatibility
• Fully compatible with DMX512(1990) and extended protocols, support200Kbps to 1000KbpsTransmission rate adaptive decoding.
• Maximum Support4096 channelAddressing, built-in 485 module, with strong load capacity, excellent anti-interference performance.
2.4. High refresh rate and system reliability.
• Picture refresh rate up2KHz, Effectively avoid flicker and stripes under high-speed camera equipment.
• E² PROM address double backupmode, even if part of the memory is damaged, the address reading is not affected, and the system reliability is extremely high.
• 80ns output channel hysteresis design, effectively reduce the surge current interference.
3. typical application scenarios
• Professional stage and performing lighting: RGB imaging lights and PAR lights that require extremely high color smoothness
• Architectural landscape lighting: Wash wall lights, line lights, to achieve delicate color gradient effect
• High-end indoor and outdoor decorationVideo walls, art installations, scenes that require excellent low-grayscale performance
• Brand customized lighting: Use unique visual features to create brand-specific lighting logos
4. design guidelines and parameter settings
4.1. Constant current value setting
The output current is precisely controlled by the REXT resistor, and the calculation formula is:
• Example: setting 20mA current requires 2KΩ resistance and 36mA requires 933Ω resistance.
4.2. System Power Management
Chip package power consumption needs to be controlled in400mWWithin. Taking 24V system driving 8 LEDs (voltage drop 2V) as an example, when the setting current is 30mA, the calculated lamp string resistance R1 needs to select an intermediate value between 138Ω and 240Ω to balance power consumption and output characteristics.
4.3. Code writing and breakpoint identification
Support AB line online code writing. After successfully writing the code, the system will provide intuitive visual feedback:The first address is red and the other addresses are white.It is convenient for engineers to quickly identify the breakpoint location, and the new address code takes effect immediately without restarting.
4.4. PCB design and anti-interference
• AI/BI differential lines should be wired in parallel. It is recommended to use shielded twisted pair with a 120Ω matching resistor connected in parallel at the end.
• VCC shall be provided with decoupling capacitor nearby (recommended 104 for 20mA application, recommended 105 above 40mA).
• Recommended value of power supply step-down resistor: 2K-2.4K for 24V system and 750-820Ω for 12V system.
Summary of 5. technical advantages
CXLE87133ACE through its uniqueEnhanced Gamma CorrectionandFoundation opening time compensationTechnology, which stands out among many DMX512 driver chips, is particularly suitable for applications with stringent requirements for low grayscale performance and color smoothness. It not only provides precise current control and stable protocol communication, but also redefines the dimming curve of LED from the perspective of human visual perception, bringing qualitative visual improvement.
Six, the application of information
6.1. Application diagram: RGB 3 color application
Note: 1. The A and B line code writing methods are adopted. When writing codes, the code writer/controller does not need to be connected to the ADRI of the first IC.
2. Pay attention to the selection of the voltage dividing resistor R1 to avoid excessive power consumption of the IC.
3. REXT port must add resistance to ground to set the output current, this port cannot be suspended.
4. The 104 capacitance of VCC to ground is the recommended value when the channel current is set to 20mA. If the channel current is set to be larger, the capacitance value should be increased,
For example, if the channel current is set to 40mA, it is recommended to use a capacitance value above 105.
6.2. Component Selection Table
(1) Selection of lamp string resistor R1
Since the long-term power consumption of the package is recommended not to be greater than 400mW, the IC power consumption should be set to be less than 400mW. As the drive current increases,
The output voltage Vout of the chip channel should be reduced, I .e. 400mW>5.2V * 10mA Vout * Iout * N(N is the number of channels and Vout is the channel end
Port voltage, Iout is the channel setting current), when N = 3,Iout = 30mA, Vout<3.87V, and because Vout = VCC-M * VL-R1 * Iout
(m is the number of lamps connected in series on a single channel, VL is the voltage drop of the lamps). when VCC = 24V,VL = 2,M = 8, R1>138 Ω is obtained. in addition, it is
In order to make the output constant current, Vout should also be made> 0.8V, so R1<240 Ω, in order to make the chip have better performance under the condition that the power consumption meets the requirements.
Output characteristics, it is recommended that R1 choose the appropriate intermediate value.
Seven, pins and functions
Eight, the conclusion
For professional lighting projects seeking the ultimate visual experience, CXLE87133ACE provides a single-chip solution that combines high performance with high reliability. Its targeted optimization design makes it an ideal choice for high-end RGB lighting systems.
For CXLE87133ACE samples, complete technical documentation or technical support, please visitJTMIC official websiteContact us.
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