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IR intros high-voltage buck regulator control IC

Posted: 12 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:International Rectifier? IR? buck control IC? buck regulators? IRS254x?

IR's high-frequency buck regulator IC

International Rectifier (IR) has introduced a high-voltage, high-frequency buck regulator control IC for AC/DC offline, non-isolated applications requiring multiple LED circuits or requiring DC/DC color-mixing capabilities. Applications include indoor and outdoor signage as well as architectural, entertainment, design and decorative lighting.

Rated at 200V or 600V, the IRS254x series incorporates a continuous mode, time-delayed hysteretic buck regulator to control the average load current within a tolerance of five percent, using an accurate on-chip band gap voltage reference. An external high-side bootstrap circuit drives the buck switching element at high frequencies up to 500kHz. A low-side driver is also provided for synchronous rectifier designs.

"The IRS254x series of high-voltage buck control ICs adapts and compensates to LED parameter variations to enable a design that is highly accurate and inherently stable," said Stephane Ernoux, product manager for IR's lighting products.

The new ICs promise a micro-power startup of less than 500?A for extremely low losses at turn-on and a deadtime of 140ns for continuous current regulation. Other features include auto restart, non-latched shutdown and PWM dimmable capability, incorporated into a compact 8-pin DIP or 8-pin SOIC package, also available in tape and reel.

These ICs use IR's advanced high-voltage IC process, which incorporates latest-generation high-voltage level-shifting and termination technology to deliver superior electrical over-stress protection and higher field reliability, in addition to other new features and enhancements.

All in 10,000 unit quantities, pricing begins at 81 cents each for the IRS2540PbF and IRS2540SPbF and 83 cents for the IRS2540STRPbF. Pricing for the IRS2541PbF and IRS2541SPbF begins at 89 cents and 91 cents for the IRS2541STRPbF. Production orders are available immediately. The devices are RoHS-compliant. Prices are subject to change.

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