CXLE87183-X is a single-channel LED constant current driver chip with high precision and no external resistor setting. The output current range covers 5mA ~ 120mA and provides 14 fixed current gears. Users can obtain accurate current output by selecting different models without external resistors. This design greatly simplifies circuit design and improves production consistency.
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CXLE87183-X: Wide Current Range LEDConstant current driveChip depth analysis
In the field of LED lighting design, the performance of the driver chip directly affects the performance of the entire lighting system.Efficiencyand reliability. Tianwei Electronics launchedCXLE87183-XSingle channel constant currentLED driver chip, with its5-120mA wide current range, 14-speed adjustable output and high conversionEfficiencyIt is an ideal solution for small and medium power LED lighting. This article will analyze the technical characteristics, application design and purchase guide of the chip in depth.
1. Chip Overview and Product Positioning
CXLE8718The 3-X is aHigh-precision, external resistance-free settingSingle-channel LEDConstant current driveChip, output current range coverage5mA~120mA, provide14 fixed current positionsUsers can obtain accurate current output by selecting different models without external resistors. This design greatly simplifies circuit design and improves production consistency.
The chip is in5V~24VTypical conversion for wide input voltage range operationEfficiencyUp98%, haveUltra-low pressure dropFeatures (only 300mV at 20mA) can significantly reduce system power consumption and heat generation.
2. core technical features
• Wide current output range: 5~120mA,14 gears can be accurately selected
• Superelevation ConversionEfficiency: The typical value is 98%, and the energy saving effect is remarkable
• Ultra-low pressure drop design: Only 300mV for 20mA drive
• High output accuracy: Full range current accuracy±5%
• ExcellentStableSex: Power/load modulation rate only0.1%/V
• Complete temperature protection: Starting linear downflow at junction temperature 135 ℃
• Dual package option：SOT23-3withSOT-89Adapt to different power requirements
3. target application areas
CXLE87183-X is suitable for a variety of LED lighting scenarios:
• Commercial sign lightingShopping mall LOGO, outdoor billboards, parking lot indication system
• architectural decorative lightingLuminous characters, landscape lighting, architectural outline lighting
• linear lighting systemLED light bar, soft light strip, cabinet lighting
• Industrial Lighting: Equipment indicator light, station lighting
• Public facilities lighting: Warehouse storage lighting and safety indicator
4. product model and pin definition
4.1. Full Model List
| Product Model | Output current | Product identification | Recommended package |
|---|---|---|---|
| CXLE87183-5 | 5mA | 19-5 | SOT23-3 |
| CXLE87183-10 | 10mA | 19-10 | SOT23-3 |
| ... | ... | ... | ... |
| CXLE87183-65 | 65mA | 19-65 | SOT23-3 |
| CXLE87183-120 | 120mA | 19-120 | SOT-89 |
4.2. Pin Function Definition
| Pin Name | SOT23-3 | SOT-89 | Function Description |
|---|---|---|---|
| VP | 1 | 1 | Constant current output |
| VDD | 2 | 3 | Chip power input |
| GND | 3 | 2 | Chip grounding |
Package selection recommendationsSOT-89 package is recommended for 120mA applications due to its better heat dissipation performance.
5. electrical characteristics and limit parameters
5.1. ABSOLUTE MAXIMUM RATING
| Parameters | Symbol | Limit value | Unit |
|---|---|---|---|
| VP/VDD Voltage | VP/VDD | -0.3~ 28 | V |
| Output current | Ivp | 120 | mA |
| Total power consumption | Pror | SOT23-3:300mW, SOT-89:700mW | mW |
| working junction temperature | Topt | -40~ 125 | ℃ |
| ESD Level | HBM/MM | 4000/200 | V |
5.2. Main electrical characteristics (Ta = 25 ℃)
| Parameters | Condition | Typical value | Unit |
|---|---|---|---|
| Quiescent current | VDD≥ 5V | 250 | µA |
| Current accuracy | VDD=5V, VP=3V | ±5 | % |
| Minimum pressure drop | Ip=20mA | 0.3 | V |
| Ip=60mA | 0.35 | V | |
| linear adjustment rate | VP=3~24V | 0.1 | %/V |
| temperature coefficient | - | 0.1 | %/10 ℃ |
5.3 typical operating characteristic curve
Test conditions: TJ = 25 ° C., VDD = 5V,VP = 3V.
6. System Design Guide
6.1. LED series number calculation.
The number of LEDs in series is determined by the following formula:
Design Examples：
When VCC = 24V,VLED = 3V, VP = 1V is set:
Therefore, it can be connected in series at most7 LEDs.
System optimization tips: In long light bar applications, if the end brightness drops, the VP voltage can be increased by reducing the number of LEDs in series or adding power access points.
6.2. Power Supply Design Recommendations
• VDD current limiting resistor recommended value:
24V system: 10kΩ ~ 15kΩ
12V system: 3kΩ ~ 5kΩ
6.3. Expand the flow application.
When the single-chip output current cannot meet the demand, it can be used.multi-chip parallelstructure to achieve current expansion. Please refer to Figure 3 in the data sheet for specific circuits.
6.4. PWM DimmingApplication
Support0.1kHz~20kHzofPWM DimmingFrequency, suitable for intelligent lighting scenes that require brightness adjustment. Refer to Figure 4 in the data sheet for the dimming circuit design.
7. Thermal Management and Reliability Design
7.1. CXLE87183-X adopts advanced temperature protection mechanism:
• Protection starting point: The junction temperature starts to linearly decrease the output current at 135 ℃
• Full protection points: The output current drops to 0 when the junction temperature is 160 ℃
• Automatic recovery: Automatically resume normal work after the temperature drops
7.2. Key points of heat dissipation design：
• Choose the right package according to the output power
• SOT23-3 packageMaximum power consumption 300mW
• SOT-89 Package Maximum Power Consumption 700mW
• Make full use of PCB copper foil to enhance heat dissipation
• Avoid working at extreme temperatures for long periods of time
Comparison of 8. package characteristics
| Parameters | SOT23-3 | SOT-89 |
|---|---|---|
| Dimensions | 2.92 × 1.6mm | 4.4 × 2.3mm |
| Power consumption | 300mW | 700mW |
| Applicable current | ≤ 65mA | ≤ 120mA |
| Application Scenarios | Compact design | High Power Applications |
9. epilogue
CXLE87183-X with itsWide current range, high-precision output, excellent energy efficiency and complete protection functionsIt provides flexible and reliable solutions for LED lighting designers. Whether it is signage lighting that requires fine current control or industrial applications that require high reliability, the chip can provide excellent performance.
ProvideCXLE87183-X full range of productsofTechnical Support,Sample Applicationwith supply services. Our professional technical team can provide you with targeted application solutions to help you quickly complete the product design and market.
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