BD8118FM-ME2

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The BD8118FM-ME2 is a high-performance pulse width modulation (PWM) control LED driver IC, designed to reduce power consumption and realize high-brightness, high-efficiency LED lighting. It is categorized as a PMIC - LED Drivers. This chip is widely used to design LED backlight systems for LCD displays for electronic products, including TVs, tablet computers, monitors and notebooks. It integrates high-precision voltage power supplies and LED current sources, with up to 8 channels and adjustable LED currents that can be varied from 0mA to 63mA with a programming resolution of 0.78mA.

The BD8118FM-ME2 is optimized for minor voltage operation and provides an extended battery life. It features accurate brightness control for LED systems, enabling LCD dimming and power savings. The low output voltage ripple performance further reduces power consumption and prevents image retention, and the oscillator stability also increases system reliability. In addition, the fault monitoring function of the LED is provided to detect LED open and LED short during LED LED normal operation.

The BD8118FM-ME2 chip\'s working principle is based on pulse width modulator (PWM) that is used to control the switching of the MOSFET. The frequency of the PWM is adjustable by the external resistor. When the external resistor is connected to the FB pin, the output frequency is determined by the following equation:
F_PWM = 1.25/ (R_EXT x C_EXT)

The resolution of the PWM DC voltage is controlled by the triangle wave index, which is then combined with the PWM counter current to generate a pulse width. The duty cycle of the PWM is then varied to adjust the LED brightness. The BD8118FM-ME2 also features a built-in power selector circuit that prevents two channels from exceeding the maximum allowable current per channel. To ensure the highest accuracy current output, the internal current reference circuit is calibrated to provide a very low error rate.

As a PMIC-LED Driver, a device that integrates multiple integrated circuit (IC) devices into an efficient module, the BD8118FM-ME2 reduces the PCB space requirements and ensures compatibility with various microcontrollers within a single IC design. This chip also provides a high-level of integration and flexibility to enable the product development cycle to be reduced significantly. It is well suited for high-end LED lighting applications, as well as general-purpose LED lighting and signage displays.

In summary, the BD8118FM-ME2 is a highly integrated, low power consumption LED driver IC, designed to reduce power consumption and extend battery life, while providing accurate brightness control for LED systems. With its high-level of integration and flexibility, as well as its low error rate, it is well suited for high-end LED lighting and signage displays.

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