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CXLE88184 constant current LED driver chip: high precision display and lighting solutions

In modern LED display and lighting systems, a stable and efficient driver chip is the key to achieving high-quality visual effects and long service life. As a high-performance constant-current LED driver chip, CXLE88184 has become an ideal choice for various LED applications due to its excellent current control accuracy, flexible dimming ability and wide operating voltage range. This article will provide an in-depth analysis of the technical features, application scenarios, and design points of the CXLE88184 to help engineers better understand and apply the product.vv9嘉泰姆

1. Product Overview

CXLE88184 is a constant current driver chip specially designed for LED display and lighting system. It integrates 4 independent constant current output channels, each channel can provide accurate constant current in the range of 20mA to 140mA. The chip uses ESOP8 package, compact structure, excellent heat dissipation performance, suitable for high-density LED module, advertising screen, indoor and outdoor lighting and dimming system.vv9嘉泰姆

2. core features and benefits

1. High precision constant current output

CXLE88184 with high current output accuracy:vv9嘉泰姆

•  Inter-channel error not exceeding ± 3.0%vv9嘉泰姆

•  Inter-chip error shall not exceed ± 3.5%vv9嘉泰姆

This means that in multi-channel or large-scale LED systems, the brightness of each LED is consistent, effectively avoiding the "color spot" or "uneven brightness" problem.vv9嘉泰姆

2. Wide voltage working range

The chip supports a working voltage of 4.5V to 5.5V. The VDD pin has a built-in 5.1V voltage regulator, which can be extended to 6V ~ 24V input through an external resistor to adapt to a variety of power supply environments.vv9嘉泰姆

3. Adjustable output current

Through the external R-EXT resistor, the user can accurately set the output current value, the formula is as follows:vv9嘉泰姆

IoT = 1.20v/riref × 60vv9嘉泰姆

For example, when Riref is 600Ω, the output current is 120mA; when Riref is 1kΩ, the output current is 72mA. This flexibility allows it to adapt to different specifications of LED lamp beads.vv9嘉泰姆
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The R-EXT pin is connected to GND with different resistance values to obtain different constant currents at the output of the OUT pin, but different constant currents enter the constant current.vv9嘉泰姆
The voltage at the flow turning point is different. As can be seen in the figure, the constant current voltage point & asymp at 120mA; 0.8V, while the constant current voltage point drops to & asymp at 60mA;vv9嘉泰姆
0.5V, when designing the circuit, the voltage drop at the OUTx end should be fully considered to avoid the driving current not reaching the set pre-value.vv9嘉泰姆
In addition, the OUTx terminal is not suitable to work at a high voltage drop for a long time when it is turned on, which will increase the power loss of the chip and thus lead.vv9嘉泰姆
It causes serious chip heating and affects the stability of the system.vv9嘉泰姆

4. High withstand voltage and low power consumption

OUT port withstand voltage up to 30V, support multiple LED series. At the same time, the leakage current of the chip in the off state is very low (≤ 0.1 μA), which helps the system to save energy.vv9嘉泰姆

5. Built-in PWM dimming function

The PWM pin supports frequency modulation signals up to 1MHz, which can realize stroboscopic dimming. It is suitable for scenes that require dynamic brightness control, such as stage lighting, smart home lighting, etc.vv9嘉泰姆

3. typical application circuit details

1. 5V power supply system

Under the 5V power supply environment, the CXLE88184 can directly drive a single LED lamp bead without external current limiting resistor. The PWM signal is controlled by the MCU to achieve brightness adjustment.vv9嘉泰姆
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As shown in the figure above, it is a CXLE88184 5V application circuit diagram. In the case of 5V power supply, each output port is connected to a lamp bead, outputvv9嘉泰姆
Both the port and the VDD port can be connected without resistors. The PWM port can directly control the brightness of the lamp beads through the program.vv9嘉泰姆

2. 12V/24V high voltage system

In a 12V or 24V system, a series resistor Rv is required to limit the VDD current, and its calculation formula is:vv9嘉泰姆

15Ma RV VCC & minus; 5.1v ≤ 25mAvv9嘉泰姆
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As shown in the figure above, it is a CXLE88184 12V application circuit diagram. In the case of 12V power supply, there is no need to have a voltage regulator to VDD portvv9嘉泰姆
Provide a voltage of about 5V. Each output port can be connected to three series of lamp beads. If the lamp bead is red, connect the resistor R.vv9嘉泰姆
Is the red light can save the resistance. The PWM port can directly control the brightness of the lamp beads through the program.

Each OUT port can drive multiple series LED, such as red LED need to add current limiting resistor, other colors can be omitted.vv9嘉泰姆
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As shown in the figure above, it is a CXLE88184 24V application circuit diagram. In the case of 24V power supply, there is no need to connect the voltage regulator to the VDD port.vv9嘉泰姆
Provide a voltage of about 5V. The PWM port can directly control the brightness of the lamp beads through the program.vv9嘉泰姆

3. Expanding flow applications

By shorting multiple OUT ports, the output current can be combined, which is suitable for high-power LED driving. For example, the maximum current of the four outputs combined can reach 560mA.vv9嘉泰姆
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       As shown in the figure above, it is a CXLE88184 circuit diagram for expanding current applications. In the case of power supply greater than 5V, there is no need to connect the voltage regulator to VDD.vv9嘉泰姆
The port provides a voltage of about 5V. The PWM port can directly control the brightness of the lamp beads through the program.vv9嘉泰姆

4. Design Considerations

1. Constant current point voltage

Constant current starting voltage is different under different output current:vv9嘉泰姆

•  About 0.8V at 120mAvv9嘉泰姆

•  About 0.5V at 60mAvv9嘉泰姆

In the design, it is necessary to ensure that the voltage drop at the OUTx end is not lower than this value, otherwise it cannot enter the constant current state.vv9嘉泰姆

2. Thermal management

The OUTx terminal should not be in a high voltage drop state for a long time when it is turned on, otherwise the chip power consumption will increase and the temperature will rise significantly, which will affect the stability of the system. It is recommended to reserve thermal pads or install heat sinks in the PCB layout.vv9嘉泰姆

3. ESD protection

The anti-static ability of the chip is 3000V(HBM). It is recommended to take anti-static measures in a dry environment to avoid performance degradation or damage due to ESD.vv9嘉泰姆

5. performance characteristics

5.1. Absolute maximum rating range

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(1) These grades in the above table cannot allow the chip to work at the limit value for a long time. If the chip works at the limit value for a long time, it is easy to reduce the reliability of the device and mayvv9嘉泰姆
Permanent damage can occur. It is not recommended to operate the chip beyond these limit parameters under any other conditions.vv9嘉泰姆
(2) All voltage values are tested relative to the network groundvv9嘉泰姆
5.2. Recommended Scope of Working Conditionsvv9嘉泰姆
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5.3. Electrical characteristicsvv9嘉泰姆

6.Package and size

The CXLE88184 is available in an ESOP8 package with dimensions of 5.00mm × 4.00mm (typical) and 1.27mm pin spacing for compact board designs.vv9嘉泰姆

7. epilogue

With its high precision, high reliability and flexible application configuration, CXLE88184 has become the preferred driver chip in the field of LED display and lighting. Whether in advertising screens, landscape lighting, intelligent dimming systems or industrial indicating equipment, it can provide stable and efficient driving performance.vv9嘉泰姆

For more information about CXLE88184 technical information, sample application or purchase information, please visitJTM-IC official websiteOr contact our technical support team. We are committed to providing customers with the best quality integrated circuit solutions to help you innovate and upgrade your products.vv9嘉泰姆

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