Ic Pinout Diagram _best_ | Inx In518
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Ultimate Guide to the INX IN518 IC: Pinout, Diagram, and Application Circuit Inx In518 Ic Pinout Diagram
As he powered up the system, Jack held his breath. The Inx In518 sprang to life, its various pins and connections humming with activity. The system began to function, performing tasks with a speed and efficiency that Jack had never seen before.
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| Parameter | Value / Information | Notes | | :--- | :--- | :--- | | | DC-DC Converter / Power Management IC (PMIC) | Generates multiple voltages for LCD panels | | Package Type | QFN-40 | 5mm x 5mm, 0.4mm pitch | | Input Voltage (VIN) | +12V DC (typical) | From T-CON board | | Key Output Voltages | VAA: +17.9V VDD: +3.3V VGL: -12.5V VGH: +30.4V VCOM: +7.32V | Generated from the main 12V input | | Control Interface | Enable (EN) and Power Good (PWR_OK) signals | For power sequencing with the main processor | | Protection Features | Overcurrent, Undervoltage, Overtemperature | Prevents damage to the LCD panel | | Sub-Models | IN518-NT02, IN518-RI02, IN518-T02 | Some variants may have specific firmware or minor differences |
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| Pin | Name | Function Description | | :--- | :--- | :--- | | 1 | VCC | : Provides the main input voltage for the chip, typically 12V from the T-CON board. | | 2 | GND | Ground : The common ground reference for the chip and all its generated outputs. | | 3, 4 | AGND | Analog Ground : Dedicated ground pins for the chip's sensitive internal analog circuitry, separate from noisy digital grounds for better stability. | | 5, 6 | EN | Enable : Receives an enable signal (often from the timing controller like IN2812A or a power-on sequence control chip) to activate the IN518 and start all its voltage outputs. | | 7, 8 | LX1, LX2 | Switching Node : Connected to the internal power MOSFET switch and the external inductor. These are the primary output pins for the boost converter, generating VAA (typically +17.9V for source driver ICs). | | 9, 10 | FB1, FB2 | Feedback : Senses the output voltage and provides a feedback signal to the chip's internal error amplifier for precise voltage regulation. | | 11, 12 | COMP | Compensation : Connected to an external RC network (resistor and capacitor) for stabilizing the chip's internal control loop, ensuring stable operation. | | 13, 14 | VGL | Negative Gate Voltage : An important output that provides the negative gate-off voltage for the LCD panel's TFT transistors, typically around -8V to -12V. | | 15, 16 | VGH | Positive Gate Voltage : Provides the high positive gate-on voltage necessary to activate the TFT's switching, typically ranging from +25V to +30V. | | 17, 18 | VGH_ON | Gate On Drive : Pins dedicated to generating the controlled high-voltage on-drive signal for the gate driver ICs. | | 19 | AVDD_VAA | Analog Power Supply : Provides the core voltage for analog circuitry in the source driver ICs and gamma reference buffer, typically around 15V-18V. | | 20, 21 | VCOM | Common Voltage : Generates the stable reference voltage for the liquid crystal layer, typically around 7.3V, requiring high precision for consistent image quality. | | 22, 23 | VDD | Digital Logic Supply : Provides a lower voltage (e.g., 3.3V) for the T-CON board's digital logic circuits, processors, and memory chips. | | 24 | PWR_OK | Power Good : A logic output signal that goes high (e.g., 3.3V) to indicate that all power supply rails are within their nominal operating ranges. | | 25, 26 | SS | Soft-Start : Connected to an external capacitor to control the soft-start time, which limits inrush current during startup for smooth power-up. | | 27, 28 | ISENSE | Current Sense : Monitors the current through the external power path to the LCD panel for overcurrent protection. | | 29-31 | NC | No Connect : Unused pins with no internal connection. | | 32-34 | VIN | Input Voltage : Additional input voltage pins connected in parallel with Pin 1 (VCC) for improved power distribution and current handling. | | 35-37 | LX3, LX4, LX5 | Switching Node : Additional switching nodes (like LX1 & LX2) used for generating other necessary voltages (e.g., VGL, VGH, VDD). | | 38-40 | BST | Bootstrap : Connected to external bootstrap capacitors (typically C0402 or C0603) that provide the necessary voltage to drive the high-side internal MOSFETs. |
This guide provides a comprehensive breakdown of the Inx In518 IC pinout diagram, pin functions, and practical applications. Inx In518 IC Pinout Overview
When a television experiences a "no display, backlight OK" symptom, hardware repair technicians frequently isolate the failure to this specific chip. Understanding its internal architecture, voltage dependencies, and pin configuration is vital for effective circuit diagnosis and chip replacement. Core Functions & System Architecture