• [ CXLE86245 ]"

Ordering

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.qXl嘉泰姆

Core performance advantages

✅& nbsp;High frequency high current driveqXl嘉泰姆

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

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

✅& nbsp;Intelligent Control and Integrated DesignqXl嘉泰姆

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

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

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

• SOP8-EP Package Heat Dissipation SolutionqXl嘉泰姆

• TTL power on/off control chipqXl嘉泰姆

• Class3A ESD protection driverqXl嘉泰姆

✅& nbsp;Industrial grade reliable protectionqXl嘉泰姆

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

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

Typical application scenarios

1. Display deviceqXl嘉泰姆

   • High uniformity backlight for commercial advertising screensqXl嘉泰姆

   • Dynamic dimming driver for esports displaysqXl嘉泰姆

2. industrial lightingqXl嘉泰姆

   • Constant current control of workshop high shed lightsqXl嘉泰姆

   • Automation equipment status indicator lightqXl嘉泰姆

   • Backlight driver for large screen displaysqXl嘉泰姆

   • High brightness lighting for industrial equipmentqXl嘉泰姆

   • Smart Home Dimmable SystemqXl嘉泰姆

   • Compact LED driver moduleqXl嘉泰姆

3. intelligent systemqXl嘉泰姆

   • Intelligent lighting wireless dimming moduleqXl嘉泰姆

   • Security equipment infrared fill light driverqXl嘉泰姆

Quick overview of key parameters

Design optimization suggestionsqXl嘉泰姆

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

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

qXl嘉泰姆
DEMO physical imageqXl嘉泰姆

qXl嘉泰姆
PCB layoutqXl嘉泰姆

qXl嘉泰姆
Typical performance curveqXl嘉泰姆

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

qXl嘉泰姆
Application InformationqXl嘉泰姆

Input capacitor selection;qXl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:qXl嘉泰姆
qXl嘉泰姆
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.qXl嘉泰姆
Output capacitor selection;qXl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:qXl嘉泰姆
qXl嘉泰姆
F in the formula: switching frequency, COUP: output capacitor, △ IL: ripple current in the inductor.qXl嘉泰姆
Inductance selection;qXl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:qXl嘉泰姆
qXl嘉泰姆
PCB Layout GuideqXl嘉泰姆

1. Power lines such as VIN, GND, SW, VOUT, etc., thick, short, and straight;qXl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;qXl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.qXl嘉泰姆
Selection Guide for Related ChipsqXl嘉泰姆

 qXl嘉泰姆

◀ Previous:CXLE86244 200KHz high-frequency LED driver IC 5V-45V wide voltage input 2A 10W efficient and compact solution

Back to top

Next▶:Cxle86143 High Power Factor Strobe-Free Linear LED Drive IC | Critical Energy Storage Mode, Programmable Power Limit, Esop8 Package | JTM-IC