Feedback input to maintain stable voltage regulation.
When looking at the IC from the , the pin numbering starts at the circular indentation (pin 1) and proceeds counter-clockwise around the chip. While official datasheets from the manufacturer are difficult to source, repair community diagrams and technical notes highlight several critical voltage pins:
When viewed from the , the INX IN518 features a square body layout. Most common iterations, such as the INX IN518 QFN-40 package listed on AliExpress, feature 40 connection pads tucked under the edges of the silicon body, surrounding a central thermal ground pad.
The chip features 40 edge contacts distributed symmetrically (10 pins per side) and a large exposed thermal pad on its bottom side. inx in518 ic pinout diagram top
Put your multimeter in diode mode and test the resistance of the CKV and power pins relative to the ground. A dead short (reading close to 0.0000.000
The (also identified as the INX IN518 ) is a 6-pin Pulse Width Modulation (PWM) Power IC commonly used in the power supply circuits of LED televisions and monitors. Pinout Configuration (Top View)
While an official datasheet is not publicly available from INX, field measurements and repair forum discussions have established a reliable set of operational parameters. The chip is powered by a 12V supply on the T-Con board and internally regulates and boosts voltages as follows: Feedback input to maintain stable voltage regulation
The INX IN518 is a testament to the increasing integration and complexity found in modern display technology. While the lack of an official datasheet makes our job harder, the collective knowledge of the repair community provides a clear path forward. By carefully examining the top marking, understanding the pinout organization, and methodically measuring the output voltages, any repair technician or advanced hobbyist can confidently diagnose and replace this critical component. Always measure twice and solder once—the QFN-40 package demands precision, but resurrecting a display by mastering the "IN518" is a rewarding accomplishment for any electronics professional.
This pin senses the output voltage through a resistor divider to maintain regulation. 3. Typical Application Circuit: DC-DC Converter
If you are dealing with a faulty panel and suspect the IN518 IC is to blame, here are several best practices for troubleshooting: Most common iterations, such as the INX IN518
Detailed diagrams and schematic integration can be found at the following sources:
: Ensure the IC "top" markings match the orientation in your boardview software to avoid incorrect installation. for this IC or specific voltage readings for its pins? Isl 88738 | PDF | Battery Charger | Electricity - Scribd
| IC | Package Top View | TX/RX Max | I2C Speed | |---------|------------------|-----------|-----------| | IN518 | QFN-48, 7x7mm | 12/12 | 400 kHz | | IN520 | QFN-64, 9x9mm | 16/20 | 1 MHz | | IN505 | QFN-32, 5x5mm | 8/8 | 400 kHz |