The CXLE87187 is manufactured by high-voltage power CMOS process, with internal integration of 5V regulator, oscillator and PWM control circuit, with 16 constant current output channels. After the chip is powered on, the built-in PWM program is automatically run to realize the sequential lighting and gradual control of the LED lights, forming a smooth flow or water droplet dynamic effect. The constant current value of the output port is 32mA, and the withstand voltage is 24V, which supports a wide range of LED lamp bead combinations and voltage conditions.
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[ CXLE87187 ]"
In the field of LED decorative lighting, the demand for dynamic display such as water lights and water drop effects is increasing, which puts forward higher requirements for the performance and integration of the driver chip. The CXLE87187 launched by Gatem (JTM-IC) is a fixed pattern 16-channel LED constant current driver chip designed for such applications. Its highly integrated, simple peripheral, flexible control features, making it an ideal choice for indoor and outdoor LED decorative lighting.
First, product overview
The CXLE87187 is manufactured by high-voltage power CMOS process, with internal integration of 5V regulator, oscillator and PWM control circuit, with 16 constant current output channels. After the chip is powered on, the built-in PWM program is automatically run to realize the sequential lighting and gradual control of the LED lights, forming a smooth flow or water droplet dynamic effect. The constant current value of the output port is 32mA, and the withstand voltage is 24V, which supports a wide range of LED lamp bead combinations and voltage conditions.
The chip provides 1000.00g packaging forms of DIP20 and SOP, which is convenient for welding and layout in different application scenarios, and is suitable for various decorative lights, advertising displays, building lighting and other scenarios.
Second, the core functional characteristics
• 16 constant current outputs: Each output constant current is 32mA, and the current deviation between channels is less than 6%, ensuring consistent LED brightness
• Built-in PWM dimmingAutomatic output gradient PWM waveform, to achieve soft light transition
• Synchronous control functionWith FIN synchronization input and FOUT synchronization output pin, support multi-chip coordination or AC power synchronization
• Built-in 5V regulatorVDD pin integrated 5V regulator, simplify the design of external power supply
• High voltage compatible: Output port withstand voltage 24V, adapt to a variety of LED series structure
• Low peripheral component requirements: Only a small number of resistive and capacitive components can work, reducing system cost and volume.
Three, typical application scenarios
CXLE87187 are widely used in the following areas:
• architectural decorative lighting: Building outline, running water in landscape lighting, chasing effect
• Advertising Logo Display: Dynamic light efficiency control in signboards and light boxes
• Holiday decorative lighting: Control of Christmas light string and festive atmosphere light belt
• Interior decorative lighting: Artistic lighting arrangements in homes and shopping malls
• INDICATION OF INDUSTRIAL STATUS: Gradient and loop control of multiple LED indications
Four, system design and configuration guide
4.1 power supply mode selection
4.1.1. AC resistance-capacitance step-down power supply
In AC220V input applications, the resistance-capacitance step-down mode can be used to supply power to the system. In a typical configuration, the relationship between the capacity of the C1 capacitor and the total LED current can be approximated as follows:
It is recommended that C1 use a 1-2μF film capacitor with a withstand voltage of not less than 400V, and connect a 100-510kΩ discharge resistor R1 in parallel to ensure safety.
Under the condition of 220V/50Hz AC, the relationship between the capacity C of capacitor C1 and the total current ILED can be approximated as: C = 14.5 ×ILED. its
The unit of C is μF and the unit of ILED is A. When the total voltage drop of LED lamp beads is different between different OUT ports, for example, although each OUT port is
Two channels are connected in parallel and three LED lamp beads are connected in series in each channel, but some ports are connected with red LEDs, some ports are connected with green LEDs, and some ports are connected with blue LEDs,
Then the total voltage drop of the lamp bead of the channel that strings the red LED is relatively low, and this channel should be connected with appropriate resistors in series, otherwise it may lead to insufficient driving of the resistance-capacitance circuit.
The pattern is abnormal. If the total pressure drop of lamp beads in each channel of the OUT0-OUT15 is V0-V15 and Vmax is the maximum value, then the OUTn channel should
The formula for calculating the resistance of the series resistance is:
RN = (VMAX-VN)/iled,
where Iled = 32mA.
4.1.2. DC regulated power supply
If DC 5-24V DC power supply is used, VDD shall be connected after current limiting by resistor R3. R3 resistance can be calculated according to the following formula:
The typical value of VDD is 5V, and the recommended value of IDD is 5-10mA. For example, at 12V power supply, R3 is about 650 Ω.
Note: 1. The component parameters should be configured according to the specific LED lamp performance parameters and the number of lamp beads used;
2. The arrangement sequence of lamp beads must be OUT0-OUT15. It is recommended to connect 2 lamp beads in parallel with each OUT port.
When the chip works normally, the current flowing through the VDD internal regulator tube ranges from 1.0mA to 15mA. The formula for calculating the resistance of R3 regulator resistor is as follows:
R3 =(VLED-VDD)/Idd. Assuming that the current Idd flowing through VDD is 10mA and the regulated voltage VDD is 5.5V, the power supply voltage is different.
The resistance value of R3 in this case is as follows:
FIN through the sampling resistor R4, direct sampling 220V AC mains for chip synchronization signal input. There is a voltage clamping circuit inside the FIN,
The FIN pin voltage can be clamped at about 6V, the FIN input current is recommended to be controlled between 2mA and 5mA, and the resistance value of the sampling resistor is recommended to be between 100K and 50K.
The smaller the selected R4 resistance, the greater the power consumption.
Due to the chip OUT port constant current output, need to add a certain voltage in the port to enter the constant current region. So in order to ensure the chip OUT port work
In the constant current state, taking into account the power consumption of the chip, the voltage applied to the OUT port should be kept at about 2V and not higher than 6V. When higher than 6V
At the same time, appropriate resistors should be connected in series on the lamp beads to keep the OUT port voltage at about 2V.
4.2 output channel configuration
It is recommended to connect 2 LED strings in parallel for each OUT port, and each string can be connected in series with 1-5 LEDs as required. In order to ensure the constant current accuracy, the output voltage should be maintained between 2-6V. If the port voltage is too high due to the LED voltage drop, the resistor voltage division needs to be connected in series, and the resistance value is calculated as follows:
Wherein Vmax is the maximum LED string voltage drop in each channel, and Vn is the current channel voltage drop.
4.3. Synchronous signal processing, chip self-synchronization
The chip supports multi-machine synchronous operation, and can drive the FIN pin of other chips through FOUT output 50Hz synchronous signal to realize the unified effect of large-scale system. The FIN pin is internally integrated with a clamp circuit, and it is recommended to connect 50-100kΩ resistors in series to limit the input current to 2-5mA.
In the state of FIN suspension, the pattern change is controlled by the chip itself. Due to process deviations, the frequency of chip output PWM changes will have
The output of multiple chips may be out of sync. At this time, the FOUT output signal of the chip can be used as the synchronization signal input of other chips,
Achieve self-synchronization of chip pattern changes. In this case, it is not recommended to use cascade synchronization, you can use the following connection method to achieve self-synchronization.
STEP:
Note: In the connection mode shown in the above figure, the FOUT pin of chip 1 will be connected as the number of chips and the distance between chips increase.
The wire length of the FIN pin of each IC will also increase accordingly, which will inevitably lead to an increase in the noise superimposed on the synchronous frequency, so it is recommended
The actual needs and different interference environment to choose the length of the connecting wire, in the case of meeting the requirements, the shorter the length of the wire, the better.
Note: When using a resistive-capacitive step-down circuit, you need to pay attention to the following:
1. The circuit is not isolated from 220V AC high voltage. Please pay attention to safety and prevent electric shock;
2. The current limiting capacitor C1 should be connected to the live wire, and the withstand voltage should be large enough (above 400V), and the discharge resistor R1 should be added;
3. Pay attention to the power consumption of the zener diode, and it is forbidden to use it when the zener tube is open;
4. It is strictly prohibited to power on the open circuit.
4.4. Input and output equivalent circuit
Five, electrical characteristics and performance parameters
Under the conditions of VDD = 5V and TA = 25 ℃, the main performance of the CXLE87187 is as follows:
• Operating voltage range: 4.0-6.0V
• Quiescent current1.0mA typical
• Output constant current value：32mA ±6%
• PWM frequency：800Hz
• Effect cycle: about 1 second
• Working temperature:-40 ℃ to 85 ℃
5.1. Limit parameters
(1) The long-term operation of the chip under the above-mentioned extreme parameter conditions may cause the reliability of the device to be reduced or permanently damaged.
The actual use of any of the parameters to meet or exceed these limits;
(2) All voltage values are tested relative to the system ground.
5.2. Recommended working conditions
5.3. Electrical characteristics
5.4. Switching characteristics
Six, design considerations
6.1 ESD protection: The chip is an electrostatic sensitive device, and anti-static measures should be taken in a dry environment.
6.2 Thermal Management: The maximum power consumption of the chip is 250mW, it is recommended to ensure good heat dissipation in a high temperature environment
6.3 PCB Layout: 104 ceramic capacitor shall be arranged nearby between VDD and GND, and FIN pin shall be connected to 103 filter capacitor.
6.4 Safety Specification: In the application of resistance-capacitance step-down, the circuit with high voltage, must do a good job of insulation and protection.
Seven, application examples show
Example one: Each channel drives 2 and 3 strings of blue LEDs (each with a voltage drop of 3V), and uses a 12V voltage regulator to supply power. The port voltage is about 3V, and no external resistor is required.
Each drive channel is connected in parallel with 2 channels, each channel is connected in series with 3 blue LED lamp beads, and the voltage regulator V1 selects 12V voltage regulator value, then each channel lamp
The total voltage drop of the bead is about 9V, and the voltage of the drive port is 12V-9V = 3V. No resistance is required in series. The circuit schematic diagram is as follows:
Example 2: Each channel drives 2 and 1 series of blue LEDs, the port voltage is about 9V, and a resistor of about 200Ω needs to be connected in series to maintain the port voltage within a reasonable range.
Each drive channel is connected in parallel with 2 channels, each channel is connected with 1 blue LED lamp bead, and the voltage regulator V1 selects 12V voltage regulator value, then each channel lamp bead
The voltage drop is about 3V, the drive port voltage is 12V-3V = 9V, and resistors need to be connected in series, with a resistance value R =(12V-3V-2V)/32mA & asymp;200 Ω, circuit principle
The figure is as follows:
Example three: In multi-color LED hybrid applications, the color channel with low voltage drop (such as red) needs to be connected in series with a resistor to balance the voltage to ensure that the brightness of each channel is consistent.
When AC220V resistance-capacitance power supply is applied, each drive channel is connected in parallel with 2 channels, each channel is connected in series with 3 LED lamp beads, and the lamps connected in series with OUT0-OUT15 ports are connected in series.
Bead colors are R, G, B, W, R, G, B, W, R, G, B, W, R, G, B, W respectively. Voltage regulator V1 selects 12V voltage regulator value, and single R
The voltage drop of the color lamp bead is about 2V, and the voltage drop of a single G or B color lamp bead is about 3V, then the channel connected in series with the R color lamp bead needs to be connected in series with a resistor and a resistance value.
R =(3V × 3-2V × 3)/32mA & asymp;100 Ω, the circuit schematic diagram is as follows:
Example four: When the switching power supply outputs DC12V power supply, each drive channel is connected in parallel with 2 channels, each channel is connected in series with 3 LED lamp beads, and the OUT0-OUT15 port
The colors of the lamp beads connected in series are R, G, B, W, R, G, B, W, R, G, B, W, R, G, B, W respectively. Due to the sufficient driving capacity of the power supply,
Therefore, the channel of R color lamp beads does not need to be connected in series with resistors. The circuit schematic diagram is as follows:
Eight, chip packaging and pin function
Nine, the conclusion
With its high integration, stable constant current output and rich synchronous control functions, the CXLE87187 provides an efficient and reliable solution for LED dynamic lighting. Whether it is a simple water effect or a complex multi-machine synchronization system, the chip can achieve excellent visual effects at the lowest peripheral cost.
If you need to obtain CXLE87187 samples, technical materials or apply for design support, please visit the official website of Jiatem (JTM-IC):www.jtm-ic.com. We are committed to providing customers with high-performance, high-reliability LED driver chips and complete solutions.
Ten, the relevant chip selection guideMore similar products.....
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| Model | Port withstand voltage | Number of channels | Communication Protocol | single channel current | Grayscale | Encapsulation form | Remarks |
| CXLE87133AB | 26V | 1/4 | DMX512 | 3-60mA | 256 | SOP16 | 512 protocol series, LED decorative driver chip |
| CXLE87133AB3 | 26V | 3 | DMX512 | 18mA | 256 | SOP8 | 512 protocol series, LED decorative driver chip |
| CXLE87133AB4 | 26V | 4 | DMX512 |
18mA | 256 | EOP8 | 512 protocol series, LED decorative driver chip |
| CXLE87133AC | 30V | 4 | DMX512 | 3-80mA | 65536 | SOP16/SSOP10(18mA) | LED decorative driver chip, Gao Hui, 512 protocol series |
| CXLE87133ACE | 30V | 3 | DMX512 | 3-80mA | 65536 | SSOP10 | LED decorative driver chip, Gao Hui, 512 protocol series |
| CXLE87133AC4 | 30V | 4 | DMX512 | 3-80mA | 256 | SOP16 | LED decorative driver chip, 512 protocol series |
| CXLE87133AD | 30V | 1-4 | DMX512 | 1-64mA | 65536 | ESSOP10 | LED decorative driver chip, high current, software can be set, 512 protocol series |
| CXLE87133ADH | 30V | 1-4 | DMX512 | 10-200mA | 65536 | ESOP16 | LED decorative driver chip, high current, software can be set, 512 protocol series |
| 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 |
| CXLE87133BCE | 30V | 3 | DMX512 | 3-80mA | 65536 | SSOP10 | LED decorative driver chip, Gao Hui, 512 protocol series |
| Single line series | |||||||
| Model | Port withstand voltage | Number of channels | Communication Protocol | single channel current | Grayscale | Encapsulation form | Remarks |
| CXLE87204 | 7V | None | - | - | - | SOP8 | LED decorative driver chip, single line series |
| CXLE87205 | 24V | 3 | Return to 0 | 18mA | 256 | SOP8 | LED decorative driver chip, colorful internal control, single line series |
| CXLE87206 | 32V | 12 | Return to 1 | <45mA | 256 | SOP16 | LED decorative driver chip, constant voltage colorful internal control, single line series |
| CXLE87207 | 32V | 9 | Return to 1 | <45mA | 256 | SOP14 | LED decorative driver chip, constant voltage colorful internal control, single line series |
| CXLE87208-12 | 7V | 4 | Return to 0 | 12mA | 256 | SOP8/Inner Seal | LED decorative driver chip, single line series |
| CXLE87209 | 10V | 3 | Return to 0 | 12mA | 256 | Wick seal | LED decorative driver chip, single line series |
| 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 |
| CXLE87151 | 24V | 3 | Return to 0 | <45mA | 256 | SOP8/DIP8 | LED decorative driver chip, constant voltage, 400KHz, constant voltage, single line series |
| 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 |
| CXLE87183-X | 24V | 1 | - | 5-65mA, 5mA per gear | External PWM | SOT23-3/SOT-89 | LED decorative driver chip, constant current diode |
| CXLE87184 | 24V | 1 | - | 15-350mA | External PWM | SOT23-6/ESOP8 | LED decorative driver chip, constant current diode |
| 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 |
| CXLE87191 | VDDV | 18 | I2C | 38mA | 256 | QFN24/SOP24 | LED decoration driver chip, meteor lights Christmas lights |
| CXLE87192 | 24V | 3 | Return to 0 | 14mA | 256 | SOP8 | LED decoration driver chip, meteor lights Christmas lights |
| 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 |
