BD7851FP-E2

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PMICs, or Power Management Integrated Circuits, are used in a wide variety of electronic devices and applications. Among those is the LED driver, which is an essential component of any LED-based lighting device. The BD7851FP-E2 is an example of PMIC used for driving LEDs. This article will discuss the application field and working principle of the BD7851FP-E2.

Application Field

The BD7851FP-E2 is most commonly used in linear and constant current LED applications. Thanks to its small size, it has been eminently successful in those areas, such as during the development of mobile handsets, digital cameras, and other small devices. Additionally, it can be used in automotive applications, such as automotive headlights, daytime running lights, and interior lighting.

Working Principle

The BD7851FP-E2 is an LED driver that operates by using P-Channel MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors) to control the LED load current. The chip works by adjusting the gate voltage of the MOSFETs to define the LED current level. Additionally, the MOSFETs are protected by a built-in fault detection circuit, which instantly cuts off the gate voltage of the MOSFETs in the event of any short-circuit or overcurrent situation.

The chip can also operate in two different modes – direct control and PWM (Pulse Width Modulation) control. In direct control mode, the LED load current is set by adjusting the gate voltage of the MOSFET directly. In PWM control mode, the LED load current is adjusted by modulating the duty cycle of the PWM signal. This allows for greater control over the LED current level and makes it possible to conserve power while still maintaining light output.

Conclusion

The BD7851FP-E2 is a highly efficient and compact LED driver chip, which is ideally suited for use in linear and constant current LED applications, such as mobile handsets, digital cameras, automotive headlights, daytime running lights, and interior lighting. Its working principle revolves around using P-Channel MOSFETs to control the LED load current, along with adjustable gate voltage and a built-in fault detection circuit. It can be operated in either direct control mode or PWM control mode, allowing for greater control and power conservation, depending on the application.

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