SC4540ULTRT

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The SC4540ULTRT is a power management and integrated circuit (PMIC) designed for LED drivers. It is designed to offer efficient power supply and feedback to LED drivers for powering applications that require a low input voltage. The product is suitable for applications which require the conversion of AC voltage to DC output current in the mA range. The SC4540ULTRT is also an ideal solution in many LED applications, such as street lighting and automotive LED illumination, where a low-power solution and improved performance are factors of utmost importance.

The product has two main functions: start-up and LED current amplification. During start-up, the SC4540ULTRT draws power from an alternating current source to operate itself and start up the LED, then maintains a constant current to power the LED driver. Once the LED is powered, the SC4540ULTRT controls and amplifies the LED current, helping to ensure a consistent light intensity that can be adjusted for different applications.

The SC4540ULTRT operates by converting AC mains power to a DC power supply with an on-board rectifier and filter. The output voltage is then regulated to the desired level with an on-board high efficiency synchronous boost converter. The converted output is then fed to the driver through the integrated current booster, where the current is adjusted to the required level.

In addition, the SC4540ULTRT uses variable frequency switching to minimize external component count, simplifying the circuit and improving overall efficiency. For example, during start-up, the switching frequency is increased so that the device can quickly draw power from the source and start up the LED. As soon as the LED is powered, the switching frequency is decreased to minimize power consumption and improve efficiency.

The SC4540ULTRT also features low standby current consumption to further improve overall system efficiency and reduce system cost. The integrated fault protection features ensure the safe operation of the product under different conditions, such as over temperature, over current and over voltage. The product is also feature rich, featuring adjustable current, brightness, adjustment and power saving modes. The integrated current adjuster can be used to adjust the LED current over a wide range and the product supports dimming functions such as pulse width modulation and analog input for brightness adjustment.

In summary, the SC4540ULTRT is an ideal solution for applications which require the conversion of AC voltage to DC output current in the mA range, such as LED lighting and automotive LED illumination. Its variable-frequency switching and low standby current consumption enable maximum efficiency and make it suitable for applications that require a low input voltage. Ultimately, the product is designed to offer efficient power supply and feedback to LED drivers and help ensure consistent light intensity across different applications.

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