CXLE87184 is a single-channel LED constant current driver chip with high precision and adjustable external resistance. The output current range covers 15mA ~ 300mA. The current value is accurately set through external resistance, providing great flexibility for designers. The chip works in a wide input voltage range of 4.5V ~ 24V, supports a PWM frequency modulation range of 100Hz ~ 20kHz, and achieves an amazing 1024:1 super dimming ratio under the condition of 100Hz, meeting the demanding requirements of professional lighting for light efficiency control.
Compared with the driver chip with fixed current output, CXLE87184 the way of setting current through external resistor, the same chip can adapt to LED applications with multiple power levels, which greatly improves the design flexibility and convenience of material management.
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[ CXLE87184 ]"
CXLE87184: high performance dimmable LEDConstant current driveChip depth analysis
In today's LED lighting market, the requirements for the flexibility, accuracy and dimming performance of the driver chip are getting higher and higher. Tianwei Electronics launchedCXLE87184Single channel constant currentLED driver chipIt is an advanced solution designed to meet the needs of medium and high power LED lighting and professional dimming. This article will comprehensively analyze the technical characteristics, application design and purchase guide of the chip, and help engineers to create a better LED lighting system.
Overview and Market Positioning of 1. Chip
CXLE87184 is one.High precision, adjustable external resistanceSingle-channel LEDConstant current driveChip, output current range coverage15mA~300mAThe current value is precisely set through an external resistor, providing designers with great flexibility. The chip is in4.5V~24Voperation over a wide input voltage range, supports100Hz~20kHzPWM FM range, and achieve amazing at 100Hz1024:1 super dimming ratioTo meet the demanding needs of professional lighting for light efficiency control.
Compared with the fixed current output driver chip,CXLE87184 through the external resistor to set the current way, so that the same chip can adapt to a variety of power levels of LED applications, greatly enhance the design flexibility and material management convenience.
2. core technical features
• Wide current output range15 ~ 300mA continuously adjustable, adapt to a variety of LED configuration
• Ultra-low pressure drop: Only 300mV when driven by 20mA, effectively lifting the systemEfficiency
• High precision output: Full range of output current accuracy up±5%
• Professional levelPWM DimmingSupport 100Hz ~ 20kHz FM, 1024:1 ultra-high dimming ratio
• ExcellentStableSex: Power/load modulation rate only0.1%/V
• Complete protection mechanism: Built-inover-temperature protection, junction temperature 135 ℃ to start linear downflow
• Dual package option：SOT23-6withESOP8Package to meet different thermal requirements
3. target application areas
CXLE87184 Suitable for the following professional lighting scenarios:
• Commercial sign lightingHigh-end shopping mall LOGO, outdoor billboards, parking lot indication system
• Architectural landscape lighting: architectural contour lighting, landscape lighting engineering
• Professional decorative lightingHigh quality luminous characters, creative lighting, exhibition lighting
• linear lighting systemHigh brightness LED light bar, professional light strip, cabinet lighting
• Industrial Lighting: Station lighting, equipment indication lighting
4. pin function and limit parameters
4.1 Pin Definition (SOT23-6/ESOP8)
| Pin Name | SOT23-6 | ESOP8 | Function Description |
|---|---|---|---|
| VDD | 1 | 1 | Chip power input (4.5~24V) |
| GND | 2 | 2,EP | Chip ground (EP is heat dissipation ground) |
| PWM | 3 | 3 | PWM DimmingSignal input |
| SET | 4 | 5 | Setting current of external resistor |
| OUT | 5 | 6 | Constant current output |
| NC | 6 | 4,7,8 | Empty Pin |
Thermal Design Tips: The EP pin of the ESOP8 package is a heat dissipation ground. It is strongly recommended to connect to the GND plane of the PCB to improve heat dissipation performance.
4.2. ABSOLUTE MAXIMUM RATING
| Parameters | Symbol | Limit value | Unit |
|---|---|---|---|
| VDD/OUT voltage | - | -0.3~ 28 | V |
| PWM/SET withstand voltage | Vpwm/Vset | -0.3~ 6.5 | V |
| Output current | Iout | 300 | mA |
| Total power consumption | Pror | SOT23-6:400, ESOP8:1200 | mW |
| ESD Level | HBM/MM | 4000/200 | V |
5. electrical characteristics and performance advantages
5.1. Under the standard test condition of Ta = 25 ℃,CXLE87184 Shows outstanding performance:
| Parameters | Condition | Typical value | Unit |
|---|---|---|---|
| Quiescent current | VDD≥ 4.5V | 250 | µA |
| Output current range | - | 15~300 | mA |
| Current accuracy | VDD = 5V, Vout = 3V | ±5 | % |
| Minimum pressure drop | Iout=20mA | 0.3 | V |
| Iout=150mA | 0.6 | V | |
| Iout=300mA | 0.8 | V | |
| linear adjustment rate | Vout=3~24V | 0.1 | %/V |
| Load adjustment rate | VDD=4.5~24V | 0.1 | %/V |
5.2. Extreme working conditions
6. System Design Guide
6.1. Output current setting
The output current is accurately set by the external resistor of the SET pin, and the calculation formula is:
Design Examples：
If an output current of 200mA is required:
Wiring recommendations: The resistor Rset should be as close as possible to the SET pin to avoid noise interference and current failure.Stable.
6.2. LED series number calculation.
The formula for calculating the number of LED series:
Application example：
When VCC = 24V,VLED = 3V, set VOUT = 1V:
Therefore, it can be connected in series at most7 LEDs.
System optimization tips: If the uneven brightness at the end of the long light bar application occurs, it can be solved by reducing the number of series LEDs or increasing the power access point.
6.3. Power Supply Design Recommendations
• VDD current limiting resistor recommendation:
24V system: 10kΩ ~ 15kΩ
12V system: 3kΩ ~ 5kΩ
6.4. PWM DimmingDesign
• Recommended dimming frequency: 100Hz ~ 1kHz (taking into account the response speed and no flicker)
• Dimming signal amplitude: 0~3.3V/5V compatible
Ultra-high dimming ratio: 100Hz 1024:1, suitable for low-light environment applications
7. Thermal Management and Reliability Design
7.1 CXLE87184 Adopting advancedover-temperature protectionMechanism:
• Protection Start Point: The junction temperature starts to linearly decrease the output current at 135 ℃
• Full protection point: The output current drops to 0 when the junction temperature is 160 ℃
• Automatic recovery: Automatically resume normal work after the temperature drops
High IC junction temperature may cause irreparable losses such as chip damage and system heat and fire. Excessive junction temperature may be caused by high current
The design of the circuit board is poor or the ambient temperature is high.
CXLE87184 hasover-temperature protectionfunction. When the junction temperature of the T chip rises to 135°C,over-temperature protectionThe circuit will start to limit the chip output power.
Flow. The output current decreases linearly to 0 when the chip junction temperature reaches 160°C.
7.2. Key points of heat dissipation design：
• Select the appropriate package according to the output power (SOT23-6 ≤ 400mW,ESOP8 ≤ 1200mW)
• Make full use of PCB copper foil as a way of heat dissipation
• The ESOP8 package must connect the EP pin to the GND plane
• Avoid working under extreme junction temperature conditions for a long time
7.3. Typical operating characteristic curve
Test conditions: T = 25 ° C., VDD = 5V, Vout = 3V.
8. Package Selection Guide
Choose the right package for your application:
• SOT23-6: Compact design for output current ≤ 150mA
• ESOP8: Suitable for high-power applications with output current ≤ 300mA, with better heat dissipation performance
Refer to the detailed mechanical drawings on pages 6-7 of the data sheet for specific package dimensions.
9. epilogue
CXLE87184 by itsFlexible current setting, professional-grade dimming performance, excellent accuracy and complete protection functions, It is an ideal choice for medium and high power LED lighting systems. Whether it is commercial lighting that requires fine dimming or industrial applications that require high reliability, the chip can provide excellent performance.
ProvideCXLE87184 Full range of products的Technical Support,Sample Applicationwith supply services. Our technical team can provide you with targeted application solutions to help you quickly complete product design and market.
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