MIC2845A-SCYMT-TR Integrated Circuits (ICs)

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MIC2845A-SCYMT-TR is a power management integrated circuit (PMIC) designed to drive high power light emitting diodes (LEDs). It is designed to provide a high efficiency, low cost, and optimized solution for driving high power LEDs in applications such as automotive headlamps, IP67 illumination, automotive interior lighting, and commercial lighting luminaires and fixtures. The IC is housed in an industry-standard 28-pin QFN and it integrates all the necessary components and circuitry to enable the development of a wide variety of LED applications.

Features

• Output current range up to 6A
• High efficiency: up to 96%
• Accurate current matching
• Integrated protection features
• Internal soft-start
• Programmable current transient dithering frequency
• Programmable over temperature protection
• Programmable average current regulation

Applications

• Automotive headlamps
• IP67 illumination applications
• Automotive interior lighting
• Commercial lighting luminaires and fixtures

Working Principle

The operating principle of the MIC2845A-SCYMT-TR begins with the pulse width modulation (PWM) signal that is provided by the external controller. The PWM signal is applied to the PPM input of the IC and is used to control the output current. The current reference circuitry then converts the PWM signal into an equivalent current and this current is then used to regulate the current delivered to the output stage.

The output stage consists of a buck converter topology that is used to provide the current to the output of the IC. The IC also integrates a number of protection features such as over temperature protection, short circuit protection, and overload protection. Additionally, the IC also includes an internal soft-start circuit that is used to reduce the inrush current when the IC is initially enabled. This ensures that the output current is ramped up in a controlled manner.

The maximum output current of the IC is determined by the external sense resistor value. The external resistor is connected between the output of the IC and ground. The output current is then regulated through a feedback loop based on the voltage which is measured across this resistor.

Conclusion

The MIC2845A-SCYMT-TR is a high efficiency, low cost PMIC designed to drive high power LEDs. It is designed to offer an optimized solution for driving a wide variety of LEDs in various applications such as automotive headlamps, IP67 illumination, automotive interior lighting, and commercial lighting luminaires and fixtures. The IC integrates all the necessary components and circuitry to enable the development of LED applications with high efficiency, low cost, and low number of external components.

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