CXLE87133ADH is a LED driver chip that supports 1/2/3/4 channel high-precision constant current output, with 65536-level gray output capability, suitable for large current and high stability lighting systems. The chip is packaged in ESOP16 with a built-in heat sink, which supports a constant current output of up to 200mA per channel. It is widely used in scenes such as point light source, wall washing lamp, line lamp, stage lighting and video wall.
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[ CXLE87133ADH ]"
Today, with the increasing popularity of intelligent lighting systems, high-performance and high-reliability LED driver chips have become the core of high-end lighting applications such as architectural decoration and stage lighting. As a multi-channel LED driver chip designed for DMX512 differential parallel protocol, CXLE87133ADH has become the preferred solution in the industry with its excellent performance and flexible configuration. This article will introduce the core features, application scenarios and technical advantages of the chip in depth, helping lighting system designers and engineers to better understand and apply the product.
1. Chip Overview
CXLE87133ADH is a LED driver chip that supports 1/2/3/4 channel high-precision constant current output, with 65536-level gray output capability, suitable for large current and high stability lighting systems. The chip is packaged in ESOP16 with a built-in heat sink, which supports a constant current output of up to 200mA per channel. It is widely used in scenes such as point light source, wall washing lamp, line lamp, stage lighting and video wall.
2. core features
2.1. Compatible and extended DMX512 protocol
The CXLE87133ADH is fully compatible with the DMX512(1990) protocol and supports its extended versions. The chip has an adaptive decoding capability of 200K ~ 1000Kbps, does not need to manually set the transmission rate, and has a maximum number of addressing channels of 4096, which is suitable for complex multi-node lighting systems.
2.2. High precision constant current output
The chip provides four independent constant current output channels of R, G, B and W. The current of each channel can be set through external resistors in the range of 10 ~ 200mA, and 64-level software adjustment per channel is supported. The current difference between chips is controlled within ± 3% to ensure color consistency and brightness uniformity.
2.3. Flexible online code writing and parameter setting.
The CXLE87133ADH has built-in E² PROM, which supports online code writing through the AI/BI line, and the address setting can be completed without disassembling the lamp. Users can independently set the power-on lighting state, field mode, no signal lighting behavior and current parameters, write code and parameter settings take effect immediately, greatly improving the efficiency of the project.
2.4. High port refresh rate and anti-interference design
The chip adopts frequency expansion technology, and the port refresh rate can reach up to 4K, which effectively avoids the stripe phenomenon when the camera equipment is shooting. The built-in anti-interference module and differential input structure improve the stability of the system in strong interference environment.
2.5. Multiple working modes support.
• 4-field modeR, G, B, W independent control
• 2 Field Mode: RG, BW group control, suitable for two-color temperature or expanded flow applications
• 1 Field Mode: Four channels in parallel, the maximum output current can reach 600mA, suitable for monochrome highlight scenes
2.6. External drive and compensation function
The chip supports PWM reverse polarity output, and can be externally connected with triode, MOS tube or high-power constant current IC. Through the COM pin external resistor, the port delay shutdown compensation can be realized to ensure reliable lighting under low gray scale.
3. typical application scenarios
• Building facade lighting: Wall wash lights, line lights
• Stage and Performing LightingRGBW lamps, intelligent dimming system
• Indoor and outdoor video walls: High refresh rate, no flicker display
• Decorative lighting system: Point light source, pixel light strip
Detailed explanation of 4. technical advantages
4.1. High integration and ease of use
The CXLE87133ADH has a built-in 5V regulator and 485 communication module, which supports 2.5V ~ 6.5V wide voltage operation and has good system compatibility. The process of code writing and parameter setting is intuitive, and there is a light prompt when it is successful, which is convenient for on-site debugging and maintenance.
4.2. Excellent constant current performance
The chip can maintain a stable output current under different load voltages, and the constant current curve is smooth, which is suitable for a variety of LED lamp combinations. Set the current through REXT resistor, combined with software adjustment, to achieve accurate brightness and white balance control.
4.3. Perfect protection mechanism
The chip has an over-temperature protection function. When the temperature exceeds 145 ℃, it will automatically flow down and recover after the temperature drops to 125 ℃, effectively preventing device damage caused by overheating.
4.4. Anti-interference and wiring recommendations
In order to ensure the quality of communication, it is recommended to use twisted pair or shielded wire wiring, AB line should be arranged in parallel, avoid star or tree topology. In long-distance transmission, it is recommended to access a 120Ω matching resistor at the end.
5. Pins and Functions
6. application information
6.1. Apply the field mode shown in Figure 1:4, the factory default, the following figure is RGBW,4-color application
It is not allowed to route wires between lamp beads, and there are strong interference lines between IC and lamp beads and power lines, so as to avoid interference and make the constant current value not
Stable.
Note: When wiring the circuit board, the connection between the REXT pin of the chip and the REXT resistance pad must be short and thick, and the longest shall not exceed 1cm. This
The connection line cannot be routed between the lamp beads, and the connection line between the IC and the lamp beads and the power line have strong interference lines arranged in parallel to avoid interference and constant current.
The value is unstable.
Note: 1. When two-color or other applications need to expand the flow, 2-field mode (software selection) can be adopted, and RG(BW) channel corresponds to the same place
Address data, the output is the same, the figure is parallel expansion application. After 2 channels are connected in parallel, the recommended maximum output current is 300mA.
2. When wiring circuit boards, the connection between the REXT pin of the chip and the REXT resistance pad must be short and thick, and the longest should not exceed 1cm. This
The connection line cannot be routed between the lamp beads, and the connection line between the IC and the lamp beads and the power line have strong interference lines arranged in parallel to avoid interference and constant current.
The value is unstable.
Note: 1. For monochrome or other expanded stream applications, 1-field mode (software selection) can be used, and RGBW 4 channels correspond to the same address data,
The output is the same, and the figure shows a parallel expansion application. The recommended maximum output current after 4 channels are connected in parallel is 600mA.
2. When wiring circuit boards, the connection between the REXT pin of the chip and the REXT resistance pad must be short and thick, and the longest should not exceed 1cm. This
The connection line cannot be routed between the lamp beads, and the connection line between the IC and the lamp beads and the power line have strong interference lines arranged in parallel to avoid interference and constant current.
The value is unstable.
Select the current file in the controller to set the actual required current, 1-64 level optional.
2. When wiring the circuit board, the connection between the REXT pin of the chip and the REXT resistance pad should be short and thick, and the longest should not be
More than 1cm, this connection cannot be routed between lamp beads, IC to lamp beads connection and power cord and other strong interference lines are arranged in parallel to avoid being affected.
to interference makes the constant current value unstable.
Note: 1. When the PWM pin is connected to VDD, it is a reverse polarity constant voltage output without frequency reduction. It is suitable for external high-power constant current driver IC. REXT Port
Suspended
2. The CXLE87133ADH is high refresh rate output, and the opening time of the first few gray levels is very short. It is necessary to ensure that the brightness is effectively opened from the first gray level.
Can be recognized by the human eye, should choose fast response time of high-power constant current IC, such as MBI6655,MBI6662,NCL30160, and so on. At the same time shall
A smaller pull-up resistor R1 is used to provide fast pull-up time. The recommended R1 value is 2.4K. If there is a constant current IC first-level gray scale, it cannot be used.
If R1 is opened and further reduced, the pull-up resistance can be further reduced when conditions permit. At this time, constant current should be considered.
The minimum dimming voltage of DIM pin of IC, if 0.2V will enter the analog dimming range, it is necessary to be cautious to further reduce R1 value,
The final feasibility is subject to whether light leakage occurs when the gray scale is "0.
3. Since the pull-up resistor R1 is small and the pull-up current is large, the pull-up resistor cannot be directly connected to the VDD pin of the CXLE87133ADH.
In addition, the voltage stabilizing tube D and resistor R V1 are used to make a voltage stabilizing circuit (except for 5V application). The pull-up resistor R1 is connected to the V1 end of the voltage stabilizing tube,
Pay attention to the value of resistor R V1, the recommended value (VCC-5V)/15mA, and pay attention to the power of resistor R V1. Can also use other 5V stable
Voltage mode, but should not be other 5V regulator terminal and CXLE87133ADH VDD directly connected.
Note 2: 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 are generated, and in some cases it will be very serious. In order to avoid problems such as code writing or abnormal picture changes, it is recommended to press the following
Measures carried out:
A: Note that the position of inductor L should be between LED and SW pin of IC. Do not change the position of LED and inductor L, otherwise
It will increase the interference.
B: All the VIN pins of the switching constant current driver chip and the CXLE87133ADH step-down resistor RVDD must be directly connected and connected to the same anti-reverse connection
After the diode, in order to reduce the impact of surge, there can be no connection between the VIN pin of the switching constant current driver chip and the CXLE87133ADH buck resistor RVDD
Behind the different anti-reverse diodes.
C: The trace from the VIN pin of the switching constant current driver chip on the circuit board to the CXLE87133ADH buck resistor RVDD is as thick and short as possible (as far as possible
Can be close to equipotential), the trace between the GND pin of the switching constant current driver chip and the GND pin of the CXLE87133ADH is as thick and short as possible (as far as possible
can be close to equipotential)
D: A 47uF electrolytic capacitor (as shown in Figure CIN) and 105 are connected to each switching constant current driver chip near VIN and GND pins
of the capacitor, and a 47uF electrolytic capacitor (as shown in fig. C1) and 105 at the pins of the buck resistor RVDD and GND near the CXLE87133ADH
of the capacitance.
E: AB lines should always be 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
F: When the interference is too large to cause the code writing to fail, the optimization is carried out according to the above suggestions. If the code writing is still unsuccessful,
As shown in the figure, PI of IC can add a filter capacitor of capacitor C P I to GND to filter out a certain degree of interference. The size of the capacitor can be determined according to the situation.
In addition, too large capacitance may also lead to the inability to write codes, which is generally recommended to be within 103.
G: Under special circumstances, the DIM pin is interfered, causing abnormal control. At this time, the DIM pin CXLE87184 as shown in the figure should be displayed.
Add a capacitor C DIM to GND, and the size of the capacitor is determined according to the actual situation, generally in the range of tens to 100PF.
SevenSummary
With its high-precision output, flexible configuration options, strong anti-interference ability and wide application adaptability, CXLE87133ADH has become an indispensable core driver chip in modern LED lighting systems. Whether in complex stage lighting systems or in demanding building facade lighting, it can provide stable, reliable and efficient performance support.
For more information on CXLE87133ADH technical materials, applications or procurement information, please visitJTMIC official websiteOr contact our technical support team.
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