International Rectifier Introduces High-Voltage Buck Control ICs for Constant LED Current Regulation

EL SEGUNDO, Calif. International Rectifier, IR (NYSE: IRF), a world leader in power management technology, today introduced a high-voltage, high-frequency buck regulator control IC for AC-DC offline, non-isolated applications requiring multiple light-emitting diode (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 IRs lighting products.

The new ICs deliver a micro-power startup of less than 500A 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 utilize IRs 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.

Part Number Package Voltage load current regulation Micro-power Start-up Deadtime Frequency
IRS2540xPbF DIP8, S08 200 +/- 5% <500A 140ns <500kHz
IRS2541xPbF DIP8, S08 600 +/-5% <500A 140ns <500kHz

Availability and Pricing

All in 10,000 unit quantities, pricing begins at US $0.81 each for the IRS2540PbF and IRS2540SPbF and $0.83 for the IRS2540STRPbF. Pricing for the IRS2541PbF and IRS2541SPbF begins at $US0.89 and $0.91 for the IRS2541STRPbF. Production orders are available immediately. The devices are RoHS compliant. Prices are subject to change.