EL9112IL

EL9112IL is a driver, receiver, and transceiver, designed for applications including LED driver and data communication systems. It is a highly integrated, low power consumption device that allows for simple and fast external components.

Application Field

The EL9112IL can be used in various applications, such as driving LEDs, allowing communication between digital devices, and providing isolation between different systems. For example, it is commonly used in automotive, automation, industrial, aerospace, and medical systems.

The EL9112IL can also be used in industrial control systems; it is ideal for driving high-power LEDs with high efficiency and low noise. The device supports current mode control and features protect features such as an over-voltage protection circuit with adjustable voltage settings, an over-temperature protection circuit, and can withstand up to 2 kV ESD.

Working Principle

The EL9112IL is a current mode device with a pulse-width modulation (PWM) input for controlling the duty cycle. It comprises two parts, the driver, and the receiver. The driver is used to drive high-power LEDs, while the receiver is used to isolate and condition the input signal from the controller and provide it to the driver.

The driver is an integrated circuit that consists of an NPN transistor and a MOSFET as the output transistor pair. The MOSFET is used to drive the LEDs, and the NPN transistor is used to control the MOSFET. The PWM input signal is fed to the NPN transistor, and when the input voltage increases the NPN transistor\'s base voltage also increases, thereby turning on the MOSFET and applying a high current to the LED.

The receiver portion of the EL9112IL is used to isolate and condition the input signal from the controller. It consists of a differential amplifier, an optocoupler with a GaN LED and a phototransistor, and an impedence converter (also known as a transimpedance amplifier). The differential amplifier amplifies the incoming signal, the optocoupler isolates and conditions the signal, and the impedence converter boosts the signal in order to drive the MOSFET.

Conclusion

The EL9112IL is an integrated device suitable for driving high-power LEDs and providing communication between digital systems. It combines a driver and a receiver, and is designed to be used in various applications. The driver portion is a current mode device with a PWM input, while the receiver is composed of a differential amplifier, an optocoupler, and an impedence converter that isolates and conditions the signal.