CXLE83179BH is a high-performance driver chip specially designed for LED lighting. It uses critical conduction mode (CrM) to work, improving efficiency while effectively reducing switching loss and electromagnetic interference (EMI). By removing the VCC and COMP capacitors in the traditional design, the chip greatly simplifies the peripheral circuit of the system and reduces the overall cost and fabric swatch difficulty.
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[ CXLE83179BH ]"
With the increasing popularity of LED lighting, efficient, stable and reliable driver chips are the core to ensure the performance and service life of lamps.CXLE83179BHAs a high-precision non-isolated step-down LED driver chip integrated with active power factor correction (PFCs), with its excellent energy efficiency performance, simplified peripheral circuit and comprehensive protection function, it has become an ideal driving solution for all kinds of general lighting applications. This paper will comprehensively analyze the technical characteristics, design methods and application advantages of CXLE83179BH, providing practical reference for engineers and procurement personnel.
I. ChIP Overview and core advantages
CXLE83179BH is a high-performance driver chip specially designed for LED lighting. It uses critical conduction mode (CrM) to work, improving efficiency while effectively reducing switching loss and electromagnetic interference (EMI). By removing the VCC and COMP capacitors in the traditional design, the chip greatly simplifies the peripheral circuit of the system and reduces the overall cost and fabric swatch difficulty.
Its core advantages include:
· High power factor (PF ≥ 0.9): meet the requirements of global energy efficiency regulations and reduce harmonic pollution of power grids;
· No VCC/COMP capacitor design: The system is simpler and more reliable;
· External current sampling resistor: supports flexible output current setting;
· Critical conduction mode: optimize EMI performance and improve overall efficiency;
· Comprehensive protection mechanism: covers LED short circuit/open circuit protection, overheating regulation, cycle-By-Cycle current limiting, etc;
· Enable function support: Compatible with dimming, color mixing and induction control;
· Compact SOP7 package: suitable for high-density layout with good heat dissipation.
II. Electrical performance and working parameters
CXLE83179BH has good adaptability and stability in electrical design. It integrates high-voltage power MOSFETs with a minimum on-resistance of 1.9 Ω and a breakdown voltage of 500V-600V, which is suitable for applications with a wide input voltage range. The operating junction temperature range of the chip is-40℃ to 150℃, and it has the function of intelligent overheating adjustment. When the surface temperature of the chip is close to 140℃, the output current will be automatically reduced to prevent overheating damage.
The key electrical parameters are as follows:
·Work current typical value 0.4mA, low static power consumption;
·The maximum conduction time is 20 μs, the minimum shutdown time is 1.8 μs, and the maximum shutdown time is 170 μs;
·The peak voltage of CS pin is limited to 1.4V, with leading edge blanking function;
·The typical value of the internal reference voltage is 310mV, with high precision;
·The OVP pin current is about 100 μA, and the external resistor is supported to set the open circuit protection voltage.
III. Typical application and Design Guide
CXLE83179BH is widely used in LED bulb, LED lamps and other general lighting systems. Its typical application circuit is simple and efficient, and its design is flexible.
The output current calculation formula is as follows:
VREF is an internal reference voltage (typical value 310mV) and RCS is an external sampling resistor. You can easily set the required LED current by adjusting the RCS.
Open circuit protection voltage setting:
The open circuit protection function can be realized through the external resistor of ROVP pin, and its voltage calculation formula is as follows:
Where L is the inductance value (in mH) and Rovp is the OVP pin pair ground resistance (in kΩ). This mechanism can limit the output voltage in the LED open circuit to protect the system safety.
IV. System protection and reliability design
CXLE83179BH integrates multiple protection functions to significantly improve the reliability of the system under abnormal working conditions:
· Short Circuit Protection: when the output is short circuit, the chip automatically enters the low frequency working mode (about 5kHz) to limit the output current;
· Open circuit protection: set the protection threshold through external resistor to avoid high output voltage;
· Cycle-By-Cycle current limit: monitor CS voltage in real time to prevent inductance saturation and MOSFET overcurrent;
· Overheating adjustment: when the temperature rises, the output current is gradually reduced to achieve a closed loop of temperature control;
· Frontier blanking and shutdown delay: improve anti-interference ability and avoid false triggering.
V. PCB layout and heat dissipation suggestions
Good PCB design is the key to ensure system performance and EMI compliance:
5.1. Ground wire layout: the power of the current sampling resistor should be short and thick, as close as possible to the GND pin of the chip;
5.2. Power loop optimization: The Loop area of large current path (such as DRAIN-inductor-diode) should be minimized to reduce radiation noise;
5.3. Cooling of the DRAIN pin: increase the copper laying area appropriately to improve the heat dissipation capacity, but pay attention to avoid introducing EMI problems;
5.4. CS pin processing: it is recommended to lay copper locally and keep away from high-frequency noise sources to improve sampling accuracy and chip heat dissipation.
VI. Packaging and ordering information
CXLE83179BH adopts standard SOP7 package, compact size, suitable for automatic patch production. The order model is CXLE83179BH, the packaging form is braiding, 4000 pieces per plate, the logo is clear, easy to trace and manage.
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VIII. Conclusion
CXLE83179BH provides an efficient, reliable and concise driving solution for LED lighting systems with its high precision stable output current, high power factor, high integration and comprehensive protection functions. Whether it is pursuing bulb with high luminous efficiency or a lamp tube system that needs stable operation for a long time, the chip can be competent and help the product to enhance its market competitiveness.
For detailed data manuals, application notes, sample application or purchase support, please visitjtm-ic.com, we will provide you with professional technical services and product support.
