SMPS Control IC for High-Power LED Illumination

International Rectifier has introduced the IRS2548D Switched Mode Power Supply (SMPS) control IC for energy-efficient applications for high-power Light Emitting Diode (LED) illumination. This includes LED street lighting, stadium lighting and theatrical lighting. The IRS2548D, which combines Power Factor Correction (PFC) and half-bridge driver in a single IC offers greater than 88 per cent efficiency for a 40V/1.3A HBLED load to deliver a higher efficiency solution compared with alternative flyback converter solutions at power levels above 60W.

By incorporating both control stages into a single IC, the IRS2548D provides an integrated solution for LED power supplies that simplifies design and helps reduce overall system cost, while providing significant energy savings. The device achieves PWM dimming down to less than two per cent light output and offers protection features that include programmable PFC and half-bridge over-current protection, latch immunity and ESD protection. The IRS2548D also includes variable frequency oscillator, fixed internal 1.6us deadtime, internal bootstrap MOSFET, internal 15.6V zener clamp diode on Vcc and micropower startup (250uA).

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