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Buck Controller Incorporated Manages High POL Current

Published: May 06,2014

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Diodes Incorporated introduced a single-phase synchronous buck PWM controller series to meet the rigors of high-current desktop PC applications. Producing a continuous current of 25A, the AP3585 devices help simplify the design of distributed power architectures serving memory arrays and graphics processing units.

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Offered in the compact and thermally efficient SO-8 and SO-8EP packages, the

AP3585 series provides single feedback loop voltage-mode control, and perates

from a supply of between 4.5V to 13.2V, delivering a high-quality output from as low as 0.6V up to 80% VIN.

The integration of a 10MHz error amplifier with a 6V/μs slew means the buck

controllers exhibit a high converter bandwidth and a fast transient response.

The devices have fixed oscillator frequencies of either 200kHz or 300kHz and

feature a high level of integration, which helps to reduce the overall size and

cost of power supplies.

With its built-in 12V+12V bootstrapped MOSFET driver and companion bootstrap diode, the AP3585 is able to achieve greater than 90% efficient power

conversion while simplifying circuit design and minimizing the external part

count.

The controllers feature comprehensive fault protection, consistent with their

high-current operating capabilities, including lossless programmable overcurrent protection, under- and over-voltage protection, soft-start functionality and thermal shutdown.

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