CXLE87198 is a single-wire three-channel LED constant current driver chip based on power CMOS process. Its core feature is the built-in 5.5V regulator circuit, support 9~12V wide voltage input, and through the external simple resistor can achieve power adaptation, greatly enhance the flexibility of the system power supply design. The chip integrates DIN and FDIN dual digital input interfaces, supports automatic signal switching and DO port cascade output, even if a single point of failure occurs in a multi-chip cascade system, it does not affect the normal operation of the subsequent chip, and the system fault tolerance is significantly enhanced.
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[ CXLE87198 ]"
CXLE87198 single-wire three-channel LED constant current driver chip comprehensive analysis
In the LED decorative lighting system, the input flexibility, output stability and packaging diversity of the driver chip are the key considerations for scheme selection. As a single-wire three-channel LED constant current driver chip supporting wide voltage input and multi-package, CXLE87198 not only has advanced features such as 12mA high-precision output, 4096-level PWM dimming, dual-channel digital interface, but also supports 9~12V wide voltage input and SOP8/flip chip/wick integrated multiple packages, greatly expanding its application scenario and design flexibility. This paper will analyze the technical characteristics of the CXLE87198, electrical parameters, typical applications and design points, to help engineers to achieve efficient and reliable LED lighting system design.
1. Product Overview
CXLE87198 is a single-wire three-channel LED constant current driver chip based on power CMOS process. Its core feature is the built-in 5.5V regulator circuit, support 9~12V wide voltage input, and through the external simple resistor can achieve power adaptation, greatly enhance the flexibility of the system power supply design. The chip integrates DIN and FDIN dual digital input interfaces, supports automatic signal switching and DO port cascade output, even if a single point of failure occurs in a multi-chip cascade system, it does not affect the normal operation of the subsequent chip, and the system fault tolerance is significantly enhanced.
The chip integrates MCU single-line dual-channel digital interface, data latch, three-way LED constant current drive and PWM brightness control circuit, which is suitable for a variety of LED decorative lighting scenes such as guardrail tube, point light source, advertising logo, building lighting, etc.
2. core features
• Wide voltage input support: Built-in 5.5V regulator, external resistor can support 9~12V input, adapt to a variety of power environment;
• High precision constant current output: Each output is fixed at 12mA, with good channel consistency;
• PWM luminance control: Support 4096 gray level adjustment, realize smooth color and brightness transition;
• Dual Input and Cascaded OutputDIN/FDIN switchable input, DO port automatic shaping forwarding, no signal attenuation;
• Ultra-Low Power Standby: Standby current as low as 200 μA, no signal for more than 1 second automatically enter the power saving mode;
• Multiple package options: Provide SOP8, flip chip, wick integration and other packaging forms;
• High antistatic ability: HBM mode ESD withstand voltage up to 4000V, adapt to complex application environment.
3. electrical characteristics and operating conditions
The CXLE87198 is stable in the recommended operating voltage range of 4.5V ~ 6.5V. Its DIN/FDIN input high level threshold is 3.5V and low level threshold is 1.0V, which has good noise tolerance. The output constant current of OUT port is 12mA, and the leakage current is lower than 0.5 μA, which ensures that there is no low light in the off state of LED.
The chip supports 800KHz data transmission rate, the PWM output frequency is 3.6KHz, and the transmission delay time is only 170ns. It responds quickly and is suitable for dynamic display and high-speed refresh scenarios.
3.1. Limit parameters
(1) These levels in the above table, the chip may cause permanent damage to the device and reduce the reliability of the device under long-term use conditions.
We do not recommend that the chip work beyond these limit parameters under any other conditions;
(2) All voltage values are tested relative to the system ground.
3.2. Recommended working conditions
3.3. Electrical characteristics
3.4. Switching characteristics
3.5. Timing characteristics
(1)0 code or 1 code cycle in 1.25 μs (frequency 800KHz) to 2.5 μs (frequency 400KHz) range, the chip can work normally
However, the high level time of 0 code and 1 code must conform to the corresponding numerical range in the above table;
(2) When reset is not required, the low level time between bytes should not exceed 50μs, otherwise the chip may reset and receive the number again after reset.
data cannot be transmitted correctly.
3.6. Function Description
After the chip is powered on and reset, it starts to receive display data. After receiving 24bit, DO port starts to forward the continuous transmission from DIN or FDIN terminal.
Data to provide display data for the next cascade chip. The DO port is low until the data is forwarded. If DIN or FDIN input
Reset reset signal, the chip OUT port will output the PWM waveform of the corresponding duty cycle according to the received 24-bit display data, and the chip will re-
Waiting to receive new data, after receiving the starting 24bit data, the chip forwards the data through the DO port, and the chip does not receive the Reset message
The original output of OUTR, OUTG and OUTB remains unchanged. The chip has a low-power standby mode, if the received 24bit display data full
0, the chip enters a low-power standby mode; if the received 24-bit display data is not all 0, the chip enters a normal mode. When the core
If the chip does not receive DIN/FDIN display data for more than 1s, the chip will automatically enter low power consumption mode. In low-power mode, the chip is connected.
Received normal non-all 0 data frames will enter the normal mode for display output.
The chip adopts automatic shaping and forwarding technology, and the signal will not be distorted and attenuated. For all chips cascaded together, the period of data transmission
is consistent.
3.6.1 Complete data structure of one frame
D1, D2, D3, D4,..., Dn have the same data format, D1 represents the display data packet of the first chip in cascade, Dn represents the first chip in cascade
N chip display data packet, each display data packet contains 24bit data bits. Reset represents a reset signal, and the low level is active.
3.6.2 Data format of Dn
Each display packet contains 8 × 3 bits of data, with the upper bits first.
R[7:0]: Used to set the PWM duty cycle of the OUTR output. All 0 codes are turned off, all 1 codes are the maximum duty cycle, and the 256 level is adjustable.
G[7:0]: Used to set the PWM duty cycle of the OUTG output. All 0 codes are turned off, all 1 codes are the maximum duty cycle, and the 256 level is adjustable.
B[7:0]: Used to set the PWM duty cycle of the OUTB output. All 0 codes are turned off, all 1 codes are the maximum duty cycle, and the 256 level is adjustable.
3.6.3 Data Receiving and Forwarding
S1 is data sent by the Di port of the controller, and S2, S3, and S4 are data forwarded by the cascade CXLE87198.
Controller Di and Fi2 port data structures: D1D2D3D4... Dn;
Controller Fi port data structure: DxD1D2D3D4... Dn; where Dx is any 24-bit data bit.
The data receiving and forwarding process during chip cascade is as follows: the controller sends data packet D1, chip 1 receives the first set of 24bit, at this time the core
Chip 1 has no forwarding; Then the controller sends the data packet D2, and chip 1 receives the second set of 24bits, because chip 1 already has the first set.
24bit, therefore, chip 1 forwards the second set of 24bit to chip 2 through DO, and chip 2 receives the data packet D2 forwarded by chip 1. This
When chip 2 does not forward; Then the controller sends the data packet D3, and chip 1 forwards the received third group of 24bits to chip 2, because the core
Chip 2 already stores the second group of 24bits, so chip 2 forwards the third group of 24bits to chip 3, and chip 3 receives the third group
24bit; and so on, all chips in the cascade will get their own display data. At this time, if the controller sends a Reset signal,
Some chips will reset and control the output of OUT port after decoding the 24bit data received respectively, completing a data refresh cycle.
Return to receive ready. Reset is active at low level, the holding time at low level is greater than 200 μs, and the chip is reset.
4. power configuration and design recommendations
The CXLE87198 supports 5V direct power supply, and can also adapt 9~12V wide voltage input through external resistor. The resistance calculation formula is as follows:
R = (DC - 5.5V) ÷ 10mA
Where DC is the power supply voltage. A typical configuration is as follows:
| Power supply voltage | Recommended series resistance value |
|---|---|
| 5V | No resistance required |
| 9V | 350Ω |
| 12V | 680Ω |
In addition, in order to prevent pin damage caused by live plugging, it is recommended to connect 100Ω protection resistors in series on DIN, DO and other signal lines, and arrange 104 decoupling capacitors between VDD and GND of each chip. The wiring should be as short as possible to ensure stability.
5. Cascade Control and Data Protocol
The chip uses a single-wire serial communication protocol, each pixel needs to receive 24-bit RGB data (8 bits each), and supports 256-level PWM dimming. The reset signal (Reset) is active at low level, and the duration needs to be greater than 200 μs.
The data frame structure is to continuously send 24-bit data packets of each chip, followed by a reset signal at the end. The chip automatically forwards subsequent data after receiving its own data to achieve seamless cascading. If no valid data is received for more than 1 second, the chip automatically enters a low-power standby mode.
6. typical applications and extended functions
In order to prevent the signal input and output pins of the chip from being damaged due to the instantaneous high voltage generated by the live plugging and unplugging of the product during the test, the signal input should be
And the output pin is connected in series with a 100Ω protection resistor. In addition, the 104 decoupling capacitors of each chip in the figure are indispensable, and the VDD and
The GND pin should be as short as possible to achieve the best decoupling effect and stabilize the chip.
6.2. Constant current output optimization
In order to ensure that the chip works in the best constant current state, it is recommended that the OUT port voltage be controlled between 1.2~3V. The output series resistance is calculated as follows:
R = (DC - 1.5V - Vled × n) id=Iout
For example, if the system supplies 12V power, the LED conduction voltage drop is 2V, 3 LEDs are connected in series, and the constant current value is 12mA, then:
R = (12 - 1.5 - 2 × 3) ÷ 0.012 & asymp; 375Ω
The CXLE87198 is driven by constant current. According to the constant current curve, when the OUT port voltage reaches 0.8V, it will enter the constant current state. But not electricity.
The higher the voltage, the higher the voltage, the greater the power consumption of the chip, the more serious the heat, reducing the reliability of the entire system. Recommended OUT port open
The on-time voltage is more appropriate between 1.2~3V, and the excessive voltage of the OUT port can be reduced by connecting resistors in series. The following are selected
calculation of resistance:
System drive voltage: DC
Single LED conduction voltage drop: Vled
Number of series LEDs: n
Constant current value: Iout
Constant current voltage: 1.5V
Resistance: R
R =(DC-1.5V -Vled× n) id=Iout
Example: system power supply: DC12V, single LED conduction voltage drop: 2V, number of series LEDs: 3, constant current value: 12mA, according to the above formula
The calculation can be obtained as follows: R =(12V-1.5V-2V × 3)÷ 12 mA & asymp;375 Ω, only need to connect a resistor of about 375Ω in series at OUT port. Actual
In application, when the light bar is long, VCC will drop at a position far away from the power access point. If the voltage of R/G/B port does not reach the constant current turning point
Voltage, the output will not reach the rated constant current value, at this time can be increased by increasing the constant current voltage value, such as to 3V, can reduce the above
The impact of the lamp, or the project to increase the power access point, to ensure that the supply voltage drop is small.
6.3. Output expansion design.
For larger drive currents, the RGB three OUT ports can be shorted for use. For each short-circuited port, the maximum output current increases by 12mA, and the maximum output current can reach 36mA after three full short-circuiting. The software needs to control three sets of registers simultaneously to achieve accurate current regulation.
CXLE87198 each OUT port constant output 12mA current, if the user needs to expand the drive current, the RGB three OUT ports can be shorted
After use, the maximum constant current value will increase by 12mA for each short-circuited OUT port, and the maximum constant current value can reach 36 after all three OUT ports are short-circuited.
mA. This method requires software to cooperate with the control at the same time, write three sets of register values, can achieve accurate current control and large drive power.
Flow.
6.4. Constant current curve
When the CXLE87198 is applied to the design of LED products, the current difference between channels and even between chips is very small, and when the load terminal voltage changes
The stability of its output current is not affected, and the constant current curve is shown in the following figure:
7. refresh rate calculation
Taking the 800KHz data rate as an example, the transmission time per pixel is 30 μs. If there are 1000 pixels in the system, the overall refresh time is 30ms and the refresh rate is about 33Hz, which meets most decorative lighting requirements. The specific correspondence is as follows:
| Pixel Points | Refresh Time (ms) | Refresh Rate (Hz) |
|---|---|---|
| 1~400 | 12 | 83 |
| 1~800 | 24 | 41 |
| 1~1000 | 30 | 33 |
segment), a CXLE87198 chip can control a set of RGB.
Calculated according to normal mode:
1bit data cycle is 1.25 μs (frequency 800KHz), a pixel data including R(8bit), G(8bit), B(8bit)
A total of 24bit, the transmission time is 1.25μs × 24 = 30μs. If there are 1000 pixels in a system, refresh all the display at once
The time of is 30μs × 1000=30ms (ignoring Reset signal time), I .e. the refresh rate of one second is: 1 ÷ 30ms & asymp;33Hz.
The following is a table of the maximum data refresh rate for the number of cascade points:
8. package and size
SOP8 and flip-chip packages are CXLE87198 available. The SOP8 package size is 5.10mm × 4.70mm, the flip chip size is 470 μm × 440 μm, and the PAD size is 65 × 65 μm, which is suitable for the integrated design of wick.
8.2. Chip internal foot bitmap.
1. Chip size: 470um * 440um
2. The thickness of the top aluminum of PAD is 3.6um
3. Note that the substrate of the chip must be suspended or connected to GND
8.4. PAD Coordinates
8.5. Inverted schematic diagram
9. applicable scenarios
• RGB point light source, pixel screen
• LED guardrail tube, contour light strip
• Building facade lighting, curtain wall lighting
• Advertising signs, decorative lighting system
• Stage lighting, entertainment lighting
10. epilogue
With its wide voltage input support, high-precision constant current output, flexible packaging options and powerful cascading fault tolerance, the CXLE87198 has demonstrated excellent overall performance in the field of LED decorative lighting. Whether it is system design in a complex power supply environment, or high-density and high-reliability pixel control requirements, the chip can provide stable and efficient drive solutions.
For CXLE87198 samples, technical information or application support, welcome to visitJTM-IC official websiteQuery for more information. We are committed to providing global customers with high-quality integrated circuit products and technical support to help your lighting innovation become more competitive.
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| CXLE87133AB | 26V | 1/4 | DMX512 | 3-60mA | 256 | SOP16 | 512 protocol series, LED decorative driver chip |
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| CXLE87133ACE | 30V | 3 | DMX512 | 3-80mA | 65536 | SSOP10 | LED decorative driver chip, Gao Hui, 512 protocol series |
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| CXLE87133AE0 | 30V | None | DMX512 | - | - | SOP8 | LED decorative driver chip, parameter can be set, 512 protocol series |
| CXLE87133AC0 | - | None | DMX512 | - | - | SOP8 | LED decorative driver chip, pure forwarding, 512 protocol series |
| CXLE87133AL1 | 30V | 1-4 | DMX512 | 3-60mA | 256 | SOP16 | LED decorative driver chip, 512 protocol series |
| CXLE87133BC | 30V | 4 | DMX512 | 3-80mA | 65536 | SOP16/SSOP10(18mA) | LED decorative driver chip, Gao Hui, 512 protocol series |
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| Single line series | |||||||
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| CXLE87208-12 | 7V | 4 | Return to 0 | 12mA | 256 | SOP8/Inner Seal | LED decorative driver chip, single line series |
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| CXLE87210 | 32V | 4 | Return to 0 | 18mA | 256 | SOP8 | LED decorative driver chip, single line series |
| CXLE87211B | 32V | 4 | Return to 1 | 6.5-38mA | 256 | SOP8 | LED decorative driver chip, 400KHz, single line series |
| CXLE87211A | 32V | 4 | Return to 1 | 6.5-38mA | 256 | SOP8 | LED decorative driver chip, 200KHz, single line series |
| CXLE87144D | 24V | 12 | Return to 0 | 17mA | 256 | SOP16/DIP16 | LED decorative driver chip, single line series |
| CXLE87140H | 24V | 3 | Return to 0 | 14mA | 256 | SOP8 | LED decorative driver chip, single line series |
| CXLE87132B | 32V | 4 | Return to 1 | 6.5-38mA | 256 | SOP8 | LED decorative driver chip, single line series |
| CXLE87143D | 24V | 6 or 9 | Return to 0 | 17mA | 256 | SOP14/DIP14 | LED decorative driver chip, single line series |
| CXLE87144 | 24V | 12 | Return to 1 | 20mA | 256 | SOP16/DIP16 | LED decorative driver chip, colorful internal control, single line series |
| CXLE87143 | 30V | 9 | Return to 1 | 20mA | 256 | SOP14/DIP14 | LED decorative driver chip, colorful internal control, single line series |
| CXLE87140 | 24V | 3 | Return to 1 | 18mA | 256 | SOP8/MSOP8 | LED decorative driver chip, colorful internal control, single line series |
| CXLE87132 | 32V | 4 | Return to 1 | 6.5-38mA | 256 | SOP8 | LED decorative driver chip, colorful internal control, single line series |
| CXLE87147 | 24V | 12 | Return to 0 | <45mA | 256 | SOP16/DIP16 | LED decorative driver chip, constant voltage, single line series |
| CXLE87145 | 24V | 9 | Return to 0 | <45mA | 256 | SOP14/DIP14 | LED decorative driver chip, constant voltage, single line series |
| CXLE87152 | 24V | 3 | Return to 0 | <45mA | 256 | SOP8/DIP8 | LED decorative driver chip, constant voltage, single line series |
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| constant current diode | |||||||
| Model | Port withstand voltage | Number of channels | Communication Protocol | single channel current | Grayscale | Encapsulation form | Remarks |
| CXLE87182-X | 24V | 1 | - | 10-18-30-60mA | External PWM | SOT-23/TO-92/SOD-123 | LED decorative driver chip, minimum 2.2V, constant current diode |
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| CXLE87185-X | 40V | 1 | - | 10～45mA | External PWM | SOT23-3 | LED decorative driver chip, constant current diode |
| Meteor lights Christmas lights | |||||||
| Model | Port withstand voltage | Number of channels | Communication Protocol | single channel current | Grayscale | Encapsulation form | Remarks |
| CXLE87186 | 7V | 6 | internal control | Maximum 80mA | - | SOP8 | LED decorative driver chip, meteor effect, meteor lights Christmas lights |
| CXLE87187 | 24V | 16 | Internal/external control | 32mA | - | SOP20/DIP20 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87188 | 24V | 16 | Internal/external control | 16mA | - | SOP20/DIP20 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87148 | 24V | 6 | internal control | 45, maximum 90mA | - | SOP8/DIP8 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87149 | - | 2 | internal control | - | - | SOP8 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87137 | 24V | 12 | Internal/external control | 32mA | - | SOP16/DIP16 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87136 | 24V | 12 | Internal/external control | 16mA | - | SOP16/DIP16 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87150 | 24V | 12 | internal control | 45, maximum 90mA | Level 16 | SOP16/DIP16 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87153 | 24V | 3 | Internal/external control | 82mA | - | SOP8/DIP8 | LED decoration driver chip, meteor lights Christmas lights |
| Double line series | |||||||
| Model | Port withstand voltage | Number of channels | Communication Protocol | single channel current | Grayscale | Encapsulation form | Remarks |
| CXLE87189 | 7V | 3 | Return to 0 | 2-25mA | 65536 Gamma | Wick seal | LED decoration driver chip, 8-bit, meteor lights Christmas lights |
| CXLE87190 | VDDV | 18 | I2C | 3-40mA | 128 | QSOP24/QFN24 | LED decoration driver chip, meteor lights Christmas lights |
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| CXLE87193 | 7V | 3 | Return to 0 | 12mA | 65536 | SOP8 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87194 | 7V | 3 | Return to 0 | 12mA | 65536 | Wick seal | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87195 | 7V | 3 | Return to 0 | 12mA | 65536 | Wick seal | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87196 | 7V | 3 | Return to 0 | 0.73-12mA | 65536 | Wick seal | LED decoration driver chip, 16-bit, meteor lights Christmas lights |
| CXLE87197 | 7V | 3 | Return to 0 | 2-17mA | 65536 | Wick seal | LED decoration driver chip, 16-bit, meteor lights Christmas lights |
| CXLE87198 | 12V | 3 | Return to 0 | 12mA | 4096 | SOP8, flip, wick integrated package | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87199 | 7V | 3 | Return to 0 | 12mA | 4096 | Inverted, integrated wick | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87200 | 7V | 3 | Return to 0 | 2.5mA | 4096 | Inverted, integrated wick | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87201 | 7V | 3 | Return to 0 | 5mA | 4096 | Inverted, integrated wick | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87202 | 12V | 3 | Return to 0 | 12mA | 4096 | SOP8, flip, wick integrated package | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87203 | 12V | 3 | Return to 0 | 12mA | 4096 | SOP8, flip, wick integrated package | LED decorative driver chip, low power consumption mode, meteor lights Christmas lights |
| CXLE87141A | 24V | 3 | Return to 1 | 18mA | 256 | SOP8 | LED decoration driver chip, meteor lights Christmas lights |
