• [ CXLE86244 ]"

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CXLE86244  It is a high-frequency synchronous rectification step-down constant current LED driver optimized for compact devices, supporting5V~45V wide input voltage rangeIt can drive 1-10 strings of LED light groups. Chip to200KHz high-frequency switch architectureRealize 2A constant current output, maximum output power of 10W, combined with 93% high conversion efficiency and ultra compact peripheral design, providing highly integrated solutions for display devices and portable lighting.

Core performance advantages

✅& nbsp;High frequency and efficient architecturevWZ嘉泰姆

• A fixed switching frequency of 200KHz significantly reduces output ripple and outperforms similar solutions in EMI performancevWZ嘉泰姆

• 0.23V current sampling voltage (accuracy±); 3%), load adjustment rate≤± 1.8%, suitable for high-precision backlight requirementsvWZ嘉泰姆

✅& nbsp;Intelligent controlvWZ嘉泰姆

• EN pin TTL power on/offSupports 0/3.3V logic level control and fast response to start stop commandsvWZ嘉泰姆

• Built in loop compensation module, requiring only 4 peripheral components, reducing PCB area by 50%vWZ嘉泰姆

✅& nbsp;Industrial grade reliabilityvWZ嘉泰姆

• Triple protection mechanismHot shutdown (-40 ℃~125 ℃), dynamic current limiting, HBM ESD protectionvWZ嘉泰姆

• No heat sink design supports 10W continuous output across the entire temperature rangevWZ嘉泰姆

Typical application scenarios

1. Display devicevWZ嘉泰姆

   • LCD display/LED advertising screen backlightvWZ嘉泰姆

   • Medical equipment high uniformity indicator light sourcevWZ嘉泰姆

2. Portable lightingvWZ嘉泰姆

   • Mobile power integrated lighting modulevWZ嘉泰姆

   • Emergency lighting fixtures with constant current drivevWZ嘉泰姆

   • LCD display backlight power supplyvWZ嘉泰姆

   • Portable device LED lightingvWZ嘉泰姆

   • Smart home dimmable drivervWZ嘉泰姆

   • Compact light source for industrial equipmentvWZ嘉泰姆

3. smart homevWZ嘉泰姆

   • Dimmable smart light bulbvWZ嘉泰姆

   • Segmented control of decorative light stripvWZ嘉泰姆

Quick overview of key parameters

Design optimization suggestions

• High frequency layout specificationSW pin routing length is 5mm, and it is recommended to use a pi filter circuit (10 Omega+100nF)vWZ嘉泰姆

• Thermal management designWhen outputting 10W, lay a 1oz copper foil heat dissipation area below the chip (15mm²)vWZ嘉泰姆

• Multiple string LED configurationWhen driving 10 strings of LEDs, it is necessary to meet the requirements;Vin ≥ (Single LED voltage drop× 10) + 0.5VvWZ嘉泰姆

• 200KHz high-frequency LED driver ICvWZ嘉泰姆

• TTL power on/off control chipvWZ嘉泰姆

• 10W low-power backlight solutionvWZ嘉泰姆

• Design of Backlight Driver for DisplayvWZ嘉泰姆

passHigh frequency and low noise characteristicsandCompact integrated design， CXLE86244 provides display backlighting and portable lightingHigh performance, low power consumption, easy deploymentThe driving solution.vWZ嘉泰姆
Bill of MaterialsvWZ嘉泰姆

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DEMO physical imagevWZ嘉泰姆

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PCB layoutvWZ嘉泰姆

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Typical performance curvevWZ嘉泰姆

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Typical characteristics (LED light VF)= 3.3V@IF =0.3A， Unless otherwise specifiedvWZ嘉泰姆

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Application InformationvWZ嘉泰姆

Input capacitor selection;vWZ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. In order to prevent large transient voltages, it is necessary to adopt a maximumvWZ嘉泰姆
Choose a low ESR (equivalent series resistance) input capacitor for RMS current requirements. For most applications, one 47uF input capacitor is sufficient for its dischargevWZ嘉泰姆
Place it as close as possible to XL9507. The maximum RMS capacitor current is given by the following equation:vWZ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. Without using ceramic capacitorsvWZ嘉泰姆
It is also recommended to add a 0.1uF to 1uF ceramic capacitor to the input capacitor for high-frequency decoupling.vWZ嘉泰姆
Output capacitor selection;vWZ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. anyvWZ嘉泰姆
The ESR of a capacitor, along with its own capacity, will generate a zero point for the system. The larger the ESR value, the lower the frequency range where the zero point is located, while the zero point of a ceramic capacitor is located at a certain frequencyvWZ嘉泰姆
At higher frequencies, it can usually be ignored and is a good choice, but compared to electrolytic capacitors, high-capacity and high-voltage ceramic capacitors have larger volumes and higher costs,vWZ嘉泰姆
Therefore, using ceramic capacitors ranging from 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:vWZ嘉泰姆
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F in the formula: switching frequency, COUP: output capacitor, △ IL: ripple current in the inductor.vWZ嘉泰姆
Inductance selection;vWZ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,vWZ嘉泰姆
And it 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 switching currentvWZ嘉泰姆
Limit value. 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:vWZ嘉泰姆
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PCB Layout GuidevWZ嘉泰姆

1. Power lines such as VIN, GND, SW, VOUT, etc., thick, short, and straight;vWZ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;vWZ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.vWZ嘉泰姆

Selection Guide for Related ChipsvWZ嘉泰姆

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