BD9421F-GE2 Integrated Circuits (ICs)

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LED drivers, or LED power supplies, are a type of power management integrated circuits (PMICs) used to control, regulate and provide power to light-emitting diodes (LEDs). The BD9421F-GE2 is a current-mode multiple-output LED driver IC (LD-IC) for white LED backlighting. It features an automatic 1-channel or 2-channel LED lighting control, a dimming control range of 0.1 – 100 percent, and And allows for a wide input-voltage range from 2.7 V to 5.5 V.

Application Field

The BD9421F-GE2 is ideal for white LED backlighting in devices such as LCD TVs and monitors, mobile phones, tablets, notebooks and portable media players. It supports 1-channel and 2-channel LED currents, and is designed to deliver up to 1 A max. output current with a dimming control range of 0.1 – 100 percent. The device can also be used for other lighting applications such as industrial lighting, decorative lighting and stage lighting.

Working Principle

The BD9421F-GE2 works by using pulse-width modulation (PWM) to control the current through the LEDs. This is done by using a comparator to switch between two different levels of current. The PWM signal is then determined by controlling one of the levels of current output and varying the duty cycle of the PWM signal to control the brightness of the LED. The BD9421F-GE2 can generate the duty cycle automatically according to the DC voltage set by a resistor connected to the DC-SET pin, or it can be directly controlled by the PWM signal from an external MCU.

The BD9421F-GE2 is equipped with a low-quiescent current consumption circuit, which reduces the current consumption from 2.6 mA to 0.35 mA. It also features an internal voltage-clamping device to protect the LED from over-voltage, and an open and short-circuit detection circuit that can detect both LED open and short-circuit conditions. The device also includes protection up to 2 A of over-current and thermal protection against the excessive LED current.

The BD9421F-GE2 is a compact and low-power LED driver that offers a wide range of applications and control modes. It is a cost-effective and efficient solution for controlling and driving multiple LEDs with a wide range of dimming. Its low-power consumption and thermal protection make it an ideal choice for many applications.

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