IRS254(01,11)(S)

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© 2010 International Rectifier

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Description

The IRS254(01,11) are high voltage, high frequency buck control ICs for constant LED current regulation. They

incorporate a continuous mode time-delayed hysteretic buck regulator to directly control the average load current,

using an accurate on-chip bandgap voltage reference. These parts directly replace the IRS2540 and IRS2541

with improved latch up immunity.

The application is inherently protected against short circuit conditions, with the ability to easily add open-circuit

protection. An external high-side bootstrap circuit drives the buck switching element at high frequencies. A low-

side driver is also provided for synchronous rectifier designs. All functions are realized within a simple 8 pin DIP

or SOIC package.