ACPL-P345-000E

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An ACPL-P345-000E isolator is an optically isolated IC that provides a controlled voltage gate driver between low-side and high-side floating power rail circuits. It utilizes a state-of-the-art monolithic integrated circuit design that offers high performance and reliability in an extremely small form factor.

ACPL-P345-000E isolator gate drivers provide a reliable, compact source for driving and controlling half-bridge and full-bridge power stages in switched-mode power supplies. They can help reduce the number of discrete components required for the power stage implementation, improve circuit reliability, and reduce system cost. The ACPL-P345-000E’s opto-coupler isolation between power rail circuits eliminates the need for circuitry that usually adds complexity and cost to the design.

The ACPL-P345-000E isolator supports a wide range of input voltages, from 3V to 15V, and offers outputs up to 600V. It features a 6A continuous current output sink capability that can be extended to of 10A with a peak current of 15A. It also offers deadtime control with both leading edge blanking and trailing edge blanking. The leading and trailing edge blanking of the ACPL-P345-000E isolator is adjustable over the full range of output voltage in a wide spectrum of the switching frequencies. The slew rate is adjustable with respect to the output voltage.

The working principle of the ACPL-P345-000E isolator is based on an optically-isolated IC that provides a controlled voltage drive between the two power rails. The IC is housed in a miniature package and is designed to deliver a high current output without the need for additional components. The device uses an opto-isolator to isolate the high voltage power rail from the low voltage power rail while providing a controlled low current pass threshold voltage.

The opto-isolator works by using a light-emitting diode (LED) in the input circuit to modulate the applied voltage input. The modulated voltage is converted to a current output, typically 0.2mA, and is then amplified and used to drive the power rail. The current output is proportional to the applied voltage and the output is limited to the specified current rating for the device. The coupling factor of the LED is used to induce the necessary voltage and current drive.

The ACPL-P345-000E isolator also includes built-in overvoltage protection circuitry to protect the power stage from damaging overvoltage conditions. The overvoltage protection is implemented through a combination of a Zener diode and a delay circuit. The Zener diode shunts the current away from the load, preventing damage, while the delay provides a delay time of up to 300ms.

The ACPL-P345-000E isolator is an ideal choice for providing electrically isolated gate drive for half-bridge or full-bridge power stages in switched-mode power supplies. It offers a wide range of voltage outputs, a continuous current output sink capability, and protection features, all while occupying minimal space and providing reliable performance. This isolator is an ideal solution for any application that requires electrically isolated gate driving and where space is limited.

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