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CXLE88177C LED driver chip data manual details.

1. Product Overview

CXLE88177C is a high-performance driver integrated circuit designed for LED display panels. The chip uses advanced CMOS technology, integrated shift register and latch function, can efficiently convert serial input data into parallel output signal, suitable for all kinds of LED display and lighting system. The chip has 16 independent constant current output channels, each channel can provide adjustable current from 3mA to 36mA, supports parallel use to enhance driving capability, and has high precision, high stability and flexible brightness control capability.g19嘉泰姆

2. core features

2.1. 16 channel constant current output

The CXLE88177C provides 16 constant current outputs, each current can be accurately adjusted in the range of 3mA ~ 36mA, suitable for a variety of LED configuration requirements. The output port has a high withstand voltage of 11V to ensure reliability in complex working environments.g19嘉泰姆

2.2. High precision current control

The chip has excellent current consistency, with channel-to-channel error ≤ ± 2.0% and chip-to-chip error ≤ ± 3.0%. The user can accurately set the output current through the external resistor (REXT) to achieve fine control of the LED brightness.g19嘉泰姆

2.3. High-speed data transmission and response

It supports a clock frequency of up to 25MHz with a minimum pulse width of only 35ns, ensuring fast and stable data transmission. Built-in Schmitt trigger, improve signal anti-interference ability, suitable for high frequency, high noise environment.g19嘉泰姆

2.4. Wide voltage working range

The operating voltage range of the chip is 3.3V to 5V, which is compatible with a variety of system power supply designs, and is suitable for indoor and outdoor full-color LED displays, lighting, energy-saving lighting and other application scenarios.g19嘉泰姆

2.5. Low power consumption and high reliability

Using QFN24 package, excellent heat dissipation performance, support -40 ℃ to 85 ℃ wide temperature working environment, with ESD protection mechanism, improve the long-term stability of the system.g19嘉泰姆

3. pin function details

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CXLE88177C a total of 24 pins, including:g19嘉泰姆

• SDI (Serial Data Input)Receive serial data signal, Schmitt buffer input.g19嘉泰姆

• CLK (shift clock): Control the timing of data shift, the rising edge is valid.g19嘉泰姆

• LE (Latch enable): Control the timing of data latch, data is transferred to the latch when high level.g19嘉泰姆

• OE (Output enable): Enable the output at low level, and turn off the output at high level.g19嘉泰姆

• R-EXT (external resistor): Used to set the output current size, connected to GND.g19嘉泰姆

• SDO (Serial Data Output): Used to cascade the next driver chip.g19嘉泰姆

• OUT0~OUT15: 16 constant current output ports, support parallel use.g19嘉泰姆

Precautions: The metal pad (METAL PAD) at the bottom of the chip needs to be connected to the GND network of the PCB to ensure good heat dissipation and electrical performance.g19嘉泰姆

4. electrical characteristics and performance parameters

4.1. Limit parametersg19嘉泰姆
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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 mayg19嘉泰姆
Permanent damage can occur. It is not recommended to operate the chip beyond these limit parameters under any other conditions.g19嘉泰姆
(2) All voltage values are measured relative to the network.

4.2. Operating voltage range

VDD = 3.0V ~ 5.5Vg19嘉泰姆

Output voltage range:-0.2V ~ 11.0Vg19嘉泰姆

4.3. Current output capability

Maximum output current: 36mA(VDD = 5V), 20mA(VDD = 3.3V)g19嘉泰姆

High current accuracy, small temperature drift, suitable for high demand display systemg19嘉泰姆
4.3.1) Switching characteristics VDD = 5.0Vg19嘉泰姆
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1) The conditions for these values are: the shortest OE under the condition that the output channel maintains a consistent response.g19嘉泰姆
2) The delay time between the even channel OUT2n (such as OUT0,OUT2,OUT4,OUT6, etc.) and the odd channel OUT2n 1 (such as OUT1,OUT3,OUT5,OUT7, etc.) is 20nS. CXLE88177C the built-in delay circuit function, the odd and even output channels can be turned on at different times to reduce the amount of current on the power line.g19嘉泰姆
4.3.2) Switching characteristics VDD = 3.3Vg19嘉泰姆
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4.4. Power consumption performance

Under different REXT resistor configurations, the chip performs well in both static and dynamic power consumption, which is suitable for battery-powered or low-power applications.g19嘉泰姆

5. Timing and Switching Characteristics

The CXLE88177C has fast signal response capability. All key timing parameters (such as Setup Time, Hold Time, transmission delay, etc.) are optimized to ensure stable operation in high-speed scanning display. The odd-even channel time-sharing conduction mechanism is specially designed to effectively reduce the current peak and improve the EMC performance of the system.g19嘉泰姆

5.1. Dynamic characteristics test circuit.g19嘉泰姆
In order to avoid the mutual influence of the parity channels, the parity channel is independently connected to the power supply during the test.g19嘉泰姆
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5.2. Timing characteristicsg19嘉泰姆

5.2.1) Communication timingg19嘉泰姆
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5.2.2) Channel output timingg19嘉泰姆
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6. Typical Application Circuit

The chip can be flexibly cascaded, suitable for large-size LED display modules. The typical application diagram shows the cascade of multi-chip CXLE88177C, which is connected to the SDI of the next chip through SDO to realize the serial transmission of data. The output current can be calculated by the following formula:g19嘉泰姆

I_OUT=1.18V/R_IREF× 15g19嘉泰姆

Among them, R_IREFR-EXT pin-to-ground resistance. For example, when the resistance is 600Ω, the output current is about 29.5mA; when the resistance is 1kΩ, the current is about 17.7mA.g19嘉泰姆

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Input and output equivalent circuitg19嘉泰姆
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7. Constant Current Characteristics and Design Suggestions

The chip can maintain a stable constant current output under different VDS voltages. Attention should be paid to the voltage drop at the OUTX end in the design to avoid the driving current not meeting the standard due to insufficient voltage. At the same time, it is not advisable to keep the output port in a high pressure drop state for a long time, so as to prevent the chip from overheating and affecting the stability of the system.g19嘉泰姆

7.1. Layout recommendations: In order to reduce electromagnetic interference, it is recommended to arrange the CXLE88177C as close to the LED module as possible to shorten the length of the signal trace.g19嘉泰姆
7.2. Constant currentg19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.g19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 30mA; 0.6V, while the constant current voltage point drops to & asymp at 20mA; 0.5V,g19嘉泰姆
When designing the circuit, the voltage drop at the OUTx end should be fully considered to avoid the driving current not reaching the set value.g19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, resulting ing19嘉泰姆
The heat of the chip is serious, which affects the stability of the system.g19嘉泰姆
In practical application, may be due to signal traces or other factors of electromagnetic interference, in order to avoid such failures, it is recommended to CXLE88177Cg19嘉泰姆
The shorter the distance from the LED display module, the better.g19嘉泰姆
7.3. Logic Diagramg19嘉泰姆

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8. Encapsulation Information

The CXLE88177C is packaged in QFN24 with a size of 4.00mm × 4.00mm and a thickness of 0.75mm, which is suitable for high-density PCB layout. The package has good thermal conductivity and is suitable for long-term high-load work.g19嘉泰姆

9. epilogue

CXLE88177C is a comprehensive and reliable LED driver chip, suitable for all kinds of static and dynamic LED display, decorative lighting, energy-saving lighting and other scenes. Its high-precision constant current output, high-speed data transmission and good anti-interference ability make it one of the preferred LED driver solutions.g19嘉泰姆

For more technical details or application samples, welcome to visitJTM-IC official websiteOr contact our technical support team.g19嘉泰姆

This article is compiled and published by the JTM-IC. Please indicate the source for reprinting.g19嘉泰姆
More LED driver chip solutions, as inJTM-IC official website.g19嘉泰姆

Ten,Related Chip Selection GuideMore similar products.....g19嘉泰姆

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