When the EN pin is high, the internal oscillator activates. The high-side MOSFET turns on, allowing current to flow from VIN through the SW pin to the external inductor. The high-side switch turns off, and the synchronous low-side MOSFET turns on to ground the inductor current during the off-cycle.
The INX IN518 typically comes in a or a 20-pin Small Outline Package (SOP-20) . Below is the most commonly referenced pinout for the DIP-18 variant found in industrial LCD controllers.
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): Typically, this IC receives a stable voltage from the T-CON board (e.g., 3.3V or 12V input, converting down to a stable 5V or 3.3V analog supply). Reference Inputs ( VGHcap V sub cap G cap H end-sub VGLcap V sub cap G cap L end-sub Inx In518 Ic Pinout Diagram
For a clear mental image of the , visualize the IC with its orientation mark (notch or dot) at the top:
Integrating the Inx In518 requires a few critical external passive components to ensure operational stability:
Do you need assistance calculating the exact for your design? Share public link When the EN pin is high, the internal oscillator activates
Check Pin 1 (VIN) for power and Pin 2 (EN) for the turn-on signal. If EN is 0V, the problem is likely the mainboard, not the IN518.
Buffered reference signal output through internal op-amps to maintain the reference baseline voltage of the liquid crystal layer. Inx In518 Pinout Topology Reference (QFN-40)
Designed for low power consumption and high-speed stability to support modern high-resolution displays. Thermal Design: The INX IN518 typically comes in a or
Although the specific pin-by-pin text for the IN518 is often bundled in schematic "zip" files, similar driver ICs in its class (like those found in monitors) typically follow this functional layout: : Main power supply input for the IC. : System ground. ENA / ON/OFF : Enable pin to turn the backlight on or off. : Dimming control (analog or PWM) to adjust brightness. : Over Voltage Protection sense pin. DRAIN / GATE : Connection to the external MOSFET for switching.
. Place it immediately adjacent to Pin 2 (VIN) and Pin 4 (GND) to minimize high-frequency switching loops. Typically ranges from
Step-by-Step T-CON Repair Strategies: Protection Mode & Short Circuits
Pins 2 (CLKIN), 11 (HSYNC), 12 (VSYNC), and 13 (DE) form the input timing interface. The IC uses these to generate internal horizontal/vertical timing sequences, aligning incoming video data with the LCD panel’s native resolution.
When building an FPGA or microcontroller-based LCD driver, the IN518 can act as a simple timing generator. The pinout allows direct connection to common MCUs like STM32 or Arduino Due.