CXLE87133BC is a four-channel high-precision constant current output LED driver chip, supports the highest 16-bit gray level, and built-in enhanced gamma correction 2.2, so that its output effect is more in line with human visual perception. The chip is compatible with and extends the DMX512(1990) protocol, supports adaptive decoding from 200Kbps to 1000Kbps, and does not need to manually set the transmission rate, which greatly improves the flexibility and stability of the system.
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[ CXLE87133BC ]"
CXLE87133BC: high performance DMX512 differential parallel LED driver chip
In the context of today's increasingly intelligent LED lighting systems, accurate, stable and efficient driver chips have become the core of various lighting effects. As a DMX512 differential parallel protocol LED driver chip designed for high-end decorative lighting and stage lighting systems, CXLE87133BC has become a solution that has attracted much attention in the industry for its excellent performance and wide application compatibility.
First, product overview
CXLE87133BC is a four-channel high-precision constant current output LED driver chip, supports the highest 16-bit gray level, and built-in enhanced gamma correction 2.2, so that its output effect is more in line with human visual perception. The chip is compatible with and extends the DMX512(1990) protocol, supports adaptive decoding from 200Kbps to 1000Kbps, and does not need to manually set the transmission rate, which greatly improves the flexibility and stability of the system.
The chip has built-in E² PROM, which supports online code writing and can realize the convenient operation of "installing before writing code. Its maximum addressing capacity of 4096 channels, suitable for large-scale, high-complexity lighting control system. Whether in the building facade lighting, landscape lighting, or in the stage performance, video wall and other professional scenes, CXLE87133BC can provide stable and reliable driving support.
Second, the core functional characteristics
• High compatibility and adaptabilityFully compatible with DMX512 protocol, support a wide range of transmission rate adaptation, with excellent anti-interference and signal recovery capabilities.
• Four-channel high-precision output: The output current of each channel can be adjusted through an external resistor in the range of 3mA ~ 80mA. The SSOP10 package version has a built-in fixed 18mA output.
Built-in E² PROM and dual backup address code: No external storage chip is required, the address code has redundant backup, and some storage damage does not affect the system operation.
• Reverse polarity down output: Support PWM reverse polarity output mode, suitable for external transistor or MOS tube to expand the current, improve the system driving ability.
• High refresh rate and visual optimization: The picture refresh rate is up to 2kHz, combined with gamma correction 2.2, to achieve smooth and delicate grayscale performance.
• Industrial grade reliability: Wide working temperature range, strong antistatic ability, suitable for all kinds of harsh environment.
Four, typical application areas
CXLE87133BC is widely used in:
• Architectural decorative lighting such as point light source, line lamp and wall washer lamp
• stage lighting control system
• Indoor and outdoor LED video wall
• Urban Lighting and Landscape Engineering
• All kinds of RGBW full color lighting system
Five, the package and pin description
The chip is available in two packages: SOP16 and SSOP10. SOP16 package supports external resistor to adjust output current, which is suitable for flexible design scenarios. SSOP10 package has built-in fixed 18mA output, which is suitable for compact design. Both packages have complete DMX512 decoding and driving capabilities, and users can flexibly select according to actual project requirements.
5.1. SOP16 Pin Arrangement
5.2. SSOP10 pin arrangement
Six, detailed technical advantages
6.1. Adaptive decoding and high load capacity.
The CXLE87133BC has a built-in high-performance 485 module, which has high input impedance and strong anti-common-mode interference ability, supports long-distance and multi-node stable communication, and greatly improves the reliability and scalability of the system.
6.2. Flexible code writing and address management.
Support AB line online code writing, can realize one-click automatic address allocation. After the code is written successfully, the chip indicates the address status through the LED color, which is convenient for on-site installation and troubleshooting.
6.3. Constant current output and power consumption control
The output current accuracy is high, and the current difference between channels and chips is controlled within ± 3%. The chip has excellent load regulation to ensure stable output current in different voltage environments. The user can accurately set the output current through the REXT resistor, and can also realize the current expansion drive through the peripheral circuit.
6.4. Enhanced Gamma Correction
The chip has a built-in 2.2 coefficient gamma correction table, which converts the 256-level input grayscale to the 65536-level output, and combines the basic on-time compensation technology to significantly improve the visual expression at low grayscale and avoid the phenomenon of "grayscale jump.
Seven, the application of design recommendations
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.
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.
Note: 1. When the PWM pin is connected to VDD, it is a reverse polarity reduced frequency constant voltage output, which is suitable for external NPN transistor base (B), and the output pin is applied
The pull-up resistor R1 is connected to VDD, and the pull-up resistor R1 should select the corresponding resistance value according to the amplification factor of the triode and the required current. When the output current is large,
When the pull-up resistor needs to be less than 5K (the base current is greater than 1mA), the value of the step-down resistor should be reduced accordingly and the 5V regulator tube or its
He 5V regulator.
2.REXT can be suspended when applied in reverse polarity.
3. The 104 capacitance of VCC to ground is the recommended value when the channel current is set to 20mA. If current expansion is used, it is recommended to increase the capacitance value to 106
Above, to reduce the fluctuation interference of the circuit VCC.
Note: 1. When the PWM pin is connected to VDD, it is a reverse polarity reduced frequency constant voltage output, which is suitable for external MOS tube gate (G) or high-power constant current drive. Application
When the output pin is connected to the pull-up resistor R1 to VDD, the pull-up resistor takes a value of more than 10K. if you want to reduce the brightness of the first gray scale, you can increase
Pull resistor R1.
2.REXT can be suspended when applied in reverse polarity.
3. The 104 capacitance of VCC to ground is the recommended value when the channel current is set to 20mA. If current expansion is used, it is recommended to increase the capacitance value to 106
Above, to reduce the fluctuation interference of the circuit VCC.
4. When writing codes, do not connect the code line to the code writer.
5. Optional high-speed low-voltage MOS tube.
Note: 1. When the PWM pin is connected to VDD, it is a reverse polarity frequency reduction constant voltage output, which is suitable for external high-power constant current driver IC.
2. REXT can be suspended when applied in reverse polarity.
3. Please refer to the CXLE87184 specification for constant current drive IC components or operation.
4. When using switch-type constant current drive IC, the interference may be very large (and power wiring and other factors are related), the system will produce
Noise and surge, in order to avoid problems such as code writing or abnormal picture changes, the following measures are recommended:
A. the VDD pin of the CXLE87184 is directly connected to the CXLE87133BC step-down resistor RZ and connected to the same anti-reverse connection diode to reduce waves
Surge effects cannot occur with CXLE87184 VDD and buck resistor RZ connected behind different anti-reverse diode.
B. The trace from the CXLE87184 VDD pin on the circuit board to the CXLE87133BC buck resistor RZ is as thick and short as possible (as close to equipotential as possible),
The trace between the GND pin of the CXLE87184 and the GND pin of the CXLE87133BC is as thick and short as possible (as close to the equal potential as possible).
C, a 47uF electrolytic capacitor and a 105 capacitor are added to each CXLE87184 near the VDD and GND pins, and the voltage is reduced near the CXLE87133BC
The resistance RZ and GND pins are combined with a 47uF electrolytic capacitor and a 105 capacitor.
D and AB lines are always wired in parallel on the board. Do not insert other elements between AB lines under special circumstances that cannot be crossed.
pieces or traces (even in special cases to be limited to the shortest local). Otherwise, the anti-interference function of AB line balanced transmission will be weakened.
E, under special circumstances, because the PWM pin is interfered, resulting in abnormal control, at this time need to be in the CXLE87184 PWM pin to GND
Add a capacitor CDIM, the size of the capacitor depends on the actual situation, generally in the tens to 100PF.
F, when the interference is too large and the code cannot be written, a filter capacitor can be added between the ADRI pin of the CXLE87133BC and GND.
(CPI), in order to filter out certain interference, the capacitance size is generally recommended to be within 103.
In practical applications, it is recommended to pay attention to the following points:
• Power Supply Design: According to the power supply voltage (5V/12V/24V), the step-down resistor Rz is reasonably selected to ensure that the chip power consumption does not exceed the rated value.
• Signal wiring: A/B signal line should use shielded twisted pair, and adopt "hand in hand" topology, and 120Ω matching resistor should be installed at the end.
• Code Writing and Testing: After writing the code, it is recommended to use a special test program to verify whether the address code is correct to avoid system abnormalities caused by error codes.
• Heat dissipation and protection: Under high current or high temperature environment, the heat dissipation path should be reasonably designed, and the current expansion device should be externally connected if necessary.
7.6. Component Selection Table 1 (Non-triode Application)
7.7. Component Selection Table 2 (triode application, single current not exceeding 120mA)
(1) Value selection of lamp string resistance R
Since the long-term power consumption of the package is recommended not to be greater than 650mW, the IC power consumption should be set to be less than 650mW. As the drive current increases,
The output voltage Vout of the chip channel should be reduced, I .e. 650mW>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 = 4,Iout = 30mA, Vout<4.98V, 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>100 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.
Eight, the conclusion
With its high integration, high reliability, strong compatibility and flexible configuration capabilities, CXLE87133BC has become an indispensable core driver chip in modern intelligent LED lighting systems. Whether it is used for architectural exterior lighting, stage effects, or large video walls, it can provide a stable, delicate and efficient lighting control experience.
For more information on CXLE87133BC technical materials, application notes or procurement information, please visitJTM-IC official website. We are committed to providing customers with complete lighting control solutions and professional technical support services.
