A6277EA-T

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The A6277EA-T is a high-efficiency LED driver integrated circuit (IC) specifically designed to drive LED strings in the industrial and commercial LED lighting applications. The A6277EA-T features an integrated low-side (n-channel) MOSFET, allowing it to be used in a wide range of LED driver applications, including those with single-cell, isolated AC or DC input. Additionally, the A6277EA-T has a wide input voltage range and supports dimming via DC voltage inputs as well as Pulse Width Modulation (PWM). The A6277EA-T belongs to the PMIC - LED Drivers family.

The A6277EA-T is specifically designed to drive up to six strings of LEDs from a single-cell input voltage, with total string currents up to 600mA each. The circuit uses a low-Side MOSFET for switching and drives the LEDs through a current-mode regulation technique. Additionally, the A6277EA-T employs a preset linear dimming function to reduce the current from each LED string to an average value of 0.5% of the peak value. This allows for a higher efficiency with better color uniformity for all LEDs in the string. It also features a programmable dimming range, allowing the user to tune the circuit for different dimming curves.

The circuit is built on a 0.35mm CMOS process and includes two main blocks: the control logic and regulation block, and the PWM dimming block. The control logic and regulation block includes a high-voltage comparator, a two-phase switching scheme, a voltage ladder, and current regulation loop which demands a fixed amount of current from the MOSFET switch. Furthermore, the circuit has an integrated low-side MOSFET with genuine protection features that help prevent short circuits and current spikes.

The second block of the A6277EA-T is the PWM dimming block. This block allows for dimming control via a DC voltage and an external PWM signal. The DC voltage is divided by an adjustable resistor network to provide a dimming range from 0%–100%. Additionally, the external PWM signal can be used to control the dimming from 0%–100%. The PWM signal is fed into the PWM dimming block and then buffered to drive the internal resistor network.

The A6277EA-T is ideal for LED lighting applications that require dimming functions and a wide input voltage range. It is built with a low-side MOSFET and provides a cost-effective solution with a wide dimming range and current regulation control loop. As a result, A6277EA-T is a reliable and efficient driver circuit suitable for a variety of commercial lighting applications.

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