MIC4801YM-TR

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The MIC4801YM-TR is a dual loop, constant current buck regulator designed for driving high-power LEDs. This device monitors the total load current of the two outputs, and a negative feedback loop around the Monitor pins regulates the current sink of both channels, allowing both channels to remain active. This current saving feature allows for more efficient operation and more LEDs to be driven with the same total power source.

The MIC4801YM-TR has several features such as "Over-Current and Over-Temperature Protection" which protect the device from faults, and it is fitted with a "Soft-Start" function which prevents "Inrush Current" issues. The MIC4801YM-TR is available in a small, 4mm × 4mm, 20-pin, "Thin Bump" package, and can be configured to drive up to 16 LEDs with two independent LEDs on each channel. The MIC4801YM-TR is an excellent choice for driving large power LED applications.

The MIC4801YM-TR is designed to be an ideal driver for high power LED lighting applications. With its constant current sink, it helps to ensure that the LED current is maintained regardless of LED forward voltage drop. In addition, this LED driver also provides many benefits such as: an internal thermal cutoff which protects against over-temperature events, adjustable output voltage, and efficient switching frequency.

In regards to its working principle, the MIC4801YM-TR utilizes a voltage-mode control system in which the output voltage of the device is regulated by a voltage loop. This voltage loop is constructed of a comparator, which compares the output voltage to a regulated reference voltage and a transconductance amplifier, which amplifies the difference between these two voltages.

This amplified voltage is applied to an internal resistor, which is used to generate a reference current or charge. The reference current is then compared to the load current and the difference between these two currents is filtered and amplified, producing a varying output voltage that is used to regulate the output current. Finally, the output voltage is compared to a regulated reference voltage, and this difference is used to reset the output current loop.

In conclusion, the MIC4801YM-TR is a dual loop, constant current buck regulator designed for driving high-power LEDs. It features many features such as over-current and over-temperature protection, as well as a soft-start function. This LED driver is ideal for applications that require efficient and reliable LED driving capabilities, and it uses a voltage-mode control system in order to regulate the output voltage.

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