LP3936SL Integrated Circuits (ICs)

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LP3936SL Application Field and Working Principle

At present, more and more household appliances and industrial equipments are equipped with LED lighting. As one of the mainstream of LED drivers, LP3936SL has rich application fields and popular with many design engineers. In this article, we will discuss the application field and working principle of the LP3936SL.

Application Field

The LP3936SL is a high efficiency, low noise and highly integrated integrated power management controller specially designed for LED lighting. It is composed of a high-voltage boost converter, a low-voltage buck converter, a low-voltage programmable current source (PCS), and a low-voltage regulator. It is mainly used in LED lighting applications such as downlight, spotlight, and street light.

The boost converter has a wide input voltage range (from 2.6V to 16V) and can drive 8 LEDs with constant current. It is embedded with a Soft-start circuit to prevent overshoot in the start-up phase. The buck converter is also embedded with a Soft-start circuit and can drive up to 16 LEDs with constant current. It also has a wide input voltage range (from 3V to 16V) and is capable of providing up to 1A of current.

The PCS is used to program the LED current. It provides an adjustable current range of 1μA to 32mA. It also has a wide input voltage range (from 1.5V to 16V). The low-voltage regulator is used to provide a stable output voltage and can provide up to 2A of current. Thus, LP3936SL provides a wide input voltage and current range, making it suitable for various LED lighting applications.

Working Principle

LP3936SL consists of a boost converter, a buck converter, a PCS and a low-voltage regulator. The boost converter consists of a MOSFET, an inductor and a capacitor. The MOSFET is connected to an external source voltage, the inductor is connected to the power ground and the capacitor is connected to the load. The buck converter consists of a MOSFET, an inductor, a diode and a capacitor. The MOSFET is connected to an external source voltage, the inductor is connected to the power ground, the diode is connected to the load and the capacitor is connected to the power ground.

When the MOSFET is on, the inductor stores energy and the voltage across the capacitor builds up. When the MOSFET is off, the stored energy is released and the voltage across the capacitor decreases. This process is repeated to generate a stable output voltage. The PCS is used to program the LED current. It is used to adjust the current through the LED in a range of 1μA to 32mA. The low-voltage regulator is used to provide a stable output voltage.

In summary, LP3936SL is a high efficiency, low noise and highly integrated integrated power management controller specially designed for LED lighting applications. It is composed of a high-voltage boost converter, a low-voltage buck converter, a low-voltage programmable current source and a low-voltage regulator. It provides a wide input voltage and current range, making it suitable for various LED lighting applications.

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