Inx In518 Ic Pinout Diagram Top |top| Here
The INX IN518 (also often identified as the IN518) is a multi-channel power management integrated circuit (PMIC) typically used in LCD TV control boards (T-CON) to generate the various supply voltages required for the display panel. Core Features
Integrated Power Management: It is designed to regulate and provide multiple voltage rails from a single input source.
Voltage Generation: Typically generates essential panel voltages including: VCC/VDD: Logic supply (usually 3.3V).
VGH (Gate High): High positive voltage for switching TFT gates on.
VGL (Gate Low): Negative voltage for switching TFT gates off. AVDD: Analog supply for the source driver. inx in518 ic pinout diagram top
Protection Circuits: Includes standard safety features like Over-Current Protection (OCP), Over-Voltage Protection (OVP), and thermal shutdown to prevent damage during circuit faults.
Compact Footprint: Usually found in a Surface Mount Device (SMD) package to fit slim display modules. Pinout and Diagram Overview
While exact pin numbering can vary by package type (e.g., QFN or TQFP), the following pin functions are standard for this class of IC: Pin Function Description VIN
Main power input (commonly 12V or 5V depending on the board) LX / SW The INX IN518 (also often identified as the
Switching node connection to the external inductor for the boost converter VGH / VGL Output pins for gate drive voltages FB (Feedback)
Feedback pins for each regulator to maintain stable output voltage EN (Enable) Control signal to turn the IC functions on or off GND System ground connection AVDD High-precision analog voltage output for source drivers Application Usage
The IN518 is most commonly used in repair and maintenance of television T-CON boards. When a TV has sound but no picture, or a "white screen" effect, technician's often check the output voltages of the IN518 to ensure the display panel is receiving its necessary power.
For a visual reference, you can find a downloadable pinout and wiring guide at Scribd's Inx In518 Pinout Document. Inx In518 Ic Pinout Diagram TOP | PDF - Scribd Determined by strapping Pin 7 (TEST) and Pin
Bill of Materials (BOM):
| Component | Value | Purpose | | :--- | :--- | :--- | | C1 (Input cap) | 10µF / 10V X5R | Input filtering & stability | | C2 (Output cap) | 10µF / 6.3V X5R | Output smoothing & transient response | | C3 (Bypass cap) | 100nF / 10V | Noise reduction (optional) | | R1 (Pull-up) | 100kΩ | Enable active high (optional if EN tied to IN) |
4. Circuit Integration and Polarity Importance
The "top view pinout" is most critical during the PCB assembly phase. Because diodes are polarity-sensitive components, installing them backward is a common failure mode.
I2C Address
- Determined by strapping Pin 7 (TEST) and Pin 39–48 (reserved). Default:
0x38(7-bit).
Decoding the INX IN518: Complete Pinout Diagram, Top Mark Identification, and Application Guide
The Pinout Logic
Unlike a chip which might have a "Pin 1" indicator like a dot or notch, the diode identifies its outputs via this band.
- Side with the Band (Cathode): This is the negative terminal. In circuit operation, conventional current flows into this terminal.
- Opposite Side (Anode): This is the positive terminal. Conventional current flows out of this terminal.
2. The "Top" View: Visual Identification and Pinout
When searching for a "top view pinout diagram," engineers are typically looking down at the component as it sits on a Printed Circuit Board (PCB). The 1N518 is typically housed in a DO-35 (Glass Axial) package. This package is a small glass cylinder with axial leads (wires coming out of both ends).
Here is how to interpret the "pinout" from the top view:
Testing and debugging
- Verify pin 1 orientation with the package mark before soldering.
- Power up with current-limited supply for first test.
- Probe VIN, GND, OUT, FB to confirm expected voltages.
- If oscillation or instability: increase output capacitance ESR per datasheet guidance or adjust compensation network.
