VNB49N04

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The VNB49N04 is a member of the STMicroelectronics power management ICs (PMICs) family, specifically the power distribution switches, load drivers and corresponding control ICs. The VNB49N04 is an ultra-low power consumption dimmable switch which is used in an LED based backlight system for LCD applications. It features fast transient for LED dimming,Programmable on-time, output voltage compatible with LED string, as well as wide operating temperature, and high noise immunity.

The VNB49N04 provides fast and efficient switching of high-current load for LED backlighting, low quiescent current for energy saving applications including LCD backlighting, clear display settings for content with low peak current and fast transient switching without the feeling of "blinking". It also supports the fast dimming time of LED backlighting and various input channels to meet the desired dimming control. Once powered up, the IC output voltage follows a predetermined or defined voltage profile to control the LED dimming.

The VNB49N04 also includes a wide operating temperature range, allowing it to perform exceptionally in harsh and cold environments as well as high noise immunity. The IC output voltage follows a pre-defined voltage profile over the range of the operating temperature, ensuring that the LED backlight can be dimmed correctly. In addition, the IC contains additional protection features such as over current protection, output short circuit protection, over voltage protection and under voltage protection.

The working principle of the VNB49N04 is simple. An incoming signal is received by the IC, which is then converted into an analog signal. This analog signal is then used to control the load current for the LED backlight. The load current is then adjusted in order to provide the desired brightness level for the LED backlight. The IC also supports different input channels in order to meet the desired dimming control.

In summary, the VNB49N04 is a small, low power device specifically designed for LED backlighting applications. It provides fast and efficient switching of large currents and offers an impressive operating temperature range, wide dimming range, high noise immunity and additional protection features. All these features make the VNB49N04 an ideal solution for LED backlighting applications.

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