• [ CXLE86245 ]"

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CXLE86245  It is a synchronous rectification buck constant current LED driver optimized for medium to high power scenarios, supporting5V~45V wide input voltage rangeIt can drive 1-10 strings of LED light groups. Chip to200KHz high-frequency switch architectureRealize 3A constant current output, maximum output power of 15W, combined with 93% high conversion efficiency and SOP8-EP enhanced heat dissipation package, providing highly integrated and reliable solutions for industrial and consumer lighting.ikU嘉泰姆

Core performance advantages

✅& nbsp;High frequency high current driveikU嘉泰姆

• A fixed switching frequency of 200KHz significantly reduces output ripple and outperforms traditional 100KHz solutions in terms of EMI characteristicsikU嘉泰姆

• 0.23V current sampling voltage (accuracy±); 3%), load adjustment rate≤± 1.5%, meeting the requirements of precision backlight controlikU嘉泰姆

✅& nbsp;Intelligent Control and Integrated DesignikU嘉泰姆

• EN pin TTL power on/off: Supports fast start stop logic level of 0/3.3V, standby power consumption<10μ AikU嘉泰姆

• Built in loop compensation module, requiring only 5 peripheral components, reducing PCB layout area by 60%ikU嘉泰姆

• 200KHz high-frequency 15W driver ICikU嘉泰姆

• SOP8-EP Package Heat Dissipation SolutionikU嘉泰姆

• TTL power on/off control chipikU嘉泰姆

• Class3A ESD protection driverikU嘉泰姆

✅& nbsp;Industrial grade reliable protectionikU嘉泰姆

• Triple protection mechanismHot shutdown (-40 ℃~125 ℃ full temperature range monitoring), dynamic current limiting, Class3A ESD protection (± 2000V HBM)ikU嘉泰姆

• SOP8-EP package provides 1.2W/mK thermal conductivity and supports 15W continuous output without heat sinkikU嘉泰姆

Typical application scenarios

1. Display deviceikU嘉泰姆

   • High uniformity backlight for commercial advertising screensikU嘉泰姆

   • Dynamic dimming driver for esports displaysikU嘉泰姆

2. industrial lightingikU嘉泰姆

   • Constant current control of workshop high shed lightsikU嘉泰姆

   • Automation equipment status indicator lightikU嘉泰姆

   • Backlight driver for large screen displaysikU嘉泰姆

   • High brightness lighting for industrial equipmentikU嘉泰姆

   • Smart Home Dimmable SystemikU嘉泰姆

   • Compact LED driver moduleikU嘉泰姆

3. intelligent systemikU嘉泰姆

   • Intelligent lighting wireless dimming moduleikU嘉泰姆

   • Security equipment infrared fill light driverikU嘉泰姆

Quick overview of key parameters

Design optimization suggestionsikU嘉泰姆

• High frequency layout specificationSW pin routing length≤ 5mm, it is recommended to use RC absorption circuit (22Ω+220pF) to suppress ringingikU嘉泰姆

• thermal designWhen outputting 15W continuously, the bottom of the chip needs to be soldered to the 2oz copper foil heat dissipation area (25mm²)ikU嘉泰姆

• LED configuration rulesWhen driving 10 strings of LEDs, it is necessary to meet the requirements;Vin ≥ (Single LED voltage drop× 10) + 0.8VikU嘉泰姆

passHigh frequency and efficient architectureandSOP8-EP package heat dissipation enhancement， CXLE86245 provides high current LED systemsHigh density, low noise, easy to expandThe full scenario driven solution.ikU嘉泰姆
Bill of MaterialsikU嘉泰姆

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DEMO physical imageikU嘉泰姆

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PCB layoutikU嘉泰姆

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Typical performance curveikU嘉泰姆

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Typical features (LED lights);   VF= 3.3V@IF =0.3A， Unless otherwise specifiedikU嘉泰姆

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Application InformationikU嘉泰姆

Input capacitor selection;ikU嘉泰姆
        In continuous mode, the input current of the converter is a set of square waves with a duty cycle of approximately VOUT/VIN. To prevent large transient voltages, it is necessary to select low ESR (equivalent series resistance) input capacitors for maximum RMS current requirements. For most applications, one 47uF input capacitor is sufficient, and its placement should be as close as possible to the CXLE86245 position. The maximum RMS capacitor current is given by the following equation:ikU嘉泰姆
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Among them, the maximum average output current IMAX is equal to the difference between the peak current and 1/2 of the peak ripple current, that is, IMAX=ILIM - △ IL/2. When ceramic capacitors are not used, it is recommended to add a 0.1uF to 1uF ceramic capacitor to the input capacitor for high-frequency decoupling.ikU嘉泰姆
Output capacitor selection;ikU嘉泰姆
        Low ESR capacitors should be selected at the output end to reduce output ripple voltage. Generally speaking, once the ESR of the capacitor is met, the capacitor is sufficient to meet the demand. The ESR of any capacitor, along with its own capacity, will create a zero point for the system. The larger the ESR value, the lower the frequency range where the zero point is located. Ceramic capacitors, on the other hand, have a zero point at a higher frequency, which can usually be ignored and is a better choice. However, compared to electrolytic capacitors, large capacity and high voltage ceramic capacitors have a larger volume and higher cost. Therefore, using ceramic capacitors with a capacitance of 0.1uF to 1uF in combination with low ESR electrolytic capacitors is a good choice. The output voltage ripple is determined by the following equation:ikU嘉泰姆
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F in the formula: switching frequency, COUP: output capacitor, △ IL: ripple current in the inductor.ikU嘉泰姆
Inductance selection;ikU嘉泰姆
        Although inductors do not affect the operating frequency, the inductance value has a direct impact on the ripple current. The inductance ripple current △ IL decreases with the increase of inductance value and increases with the increase of VIN and VOUT. A reasonable starting point for setting ripple current is △ IL=0.3 * ILIM, where ILIM is the peak switch current limit. In order to ensure that the ripple current is below a specified maximum value, the inductance value should be selected according to the following formula:ikU嘉泰姆
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PCB Layout GuideikU嘉泰姆

1. Power lines such as VIN, GND, SW, VOUT, etc., thick, short, and straight;ikU嘉泰姆
2. CS wiring should be kept away from switch signals such as inductors, and it is recommended to use a ground wire to surround it;ikU嘉泰姆
3. The positive pole of the input capacitor is close to the VIN pin of the chip, and the negative pole of the input capacitor is close to the GND pin of the chip.ikU嘉泰姆
Selection Guide for Related ChipsikU嘉泰姆

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