MC34848EPR2

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PMIC - LED Drivers, such as the MC34848EPR2, are modern, powerful integrated circuits for driving LED-based lighting applications or LED display. These LED drivers, or LED DIAS, are designed to be compact and energy-efficient, and are able to provide high-precision, high-precision current control over the wide current range required for use with modern LEDs.

MC34848EPR2 Application Field

The MC34848EPR2 is a smart LED driver IC for driving high-brightness LEDs. It drives up to 16 string LEDs and can be used in an application such as display backlight as well as general purpose lighting. Specifically, it is designed to reduce the size, cost and circuit complexity of designs in comparison to discrete solutions due to a simple external and comprehensive internal architecture.

The MC34848EP2 is suitable for dimming applications using either PWM or analog input signals. It supports a wide variety of dimming solutions, including pulse width modulation (PWM) dimming and analog dimming. It offers smooth, flicker-free dimming without the need for additional active dimming circuitry.

The MC34848EPR2 is capable of driving either high-side or low-side outputs and supports both DC-reactive and AC-reactive load conditions. There is no need for additional active switching control such as relays or transistors as the device does not require any firmware. Additionally, the MC34848EPR2 features various features to simplify the software configuration, such as the internal overcurrent detection and auto-restart function to protect the LEDs from sudden increases in current.

MC34848EPR2 Working Principle

The MC34848EPR2 is made up of four main components: a controller, a power stage, control modulation input ICs, and LED strings. It has output control circuits to drive the LED strings in a common direct current (DC) or alternating current (AC) mode.

The controller is the brain of the MC34848EPR2 and is responsible for managing the power stage, managing the control modulation inputs, and driving the LED string outputs. It is built around an 8-bit MCU and uses a range of onboard peripherals such as timer, counters, and DACs to accomplish its tasks.

The power stage is responsible for delivering the required current to each LED string at the given set point, which can be controlled either by a PWM or an analog voltage signal. It is built with multiple MOSFET switches arranged in a Half Bridge or H-Bridge configuration, controlled by two PWM outputs from the controller.

The control modulation inputs, which can be either a PWM or an analog voltage, provide the controller with the necessary signals to drive the power stage. The external circuitry connected to these pins allows the user to control the current output to each string independently.

Lastly, the LED strings are connected to the output of the Half Bridge or H-Bridge configured power stage. The PWM outputs from the controller are used to alternately switch the High side and Low side MOSFETs of the Half bridge in the appropriate order, thus delivering a steady current to the LEDs.

Conclusion

The MC34848EPR2 is a modern, powerful integrated circuit for driving LED-based lighting applications or LED display. It is a smart LED driver IC for driving high-brightness LEDs, with features for reducing size, cost and circuit complexity. The MC34848EPR2 supports both DC-reactive and AC-reactive load conditions, and is capable of driving either high-side or low-side outputs. It consists of four main components: controller, power stage, control modulation inputs, and LED strings.

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