The IRS2548D, which combines Power Factor Correction (PFC) and half-bridge driver in a single IC offers greater than 88 percent efficiency for a 40V/1.3A HBLED load to deliver a higher efficiency solution compared to alternative Flyback converter solutions at power levels above 60W.

IRS2548D LED Control IC Increases Efficiency,

Simplifies Design and Reduces Overall System

Cost

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DATA SHEET

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Advantages• By incorporating both control stages into a single IC, the new

IRS2548D provides an integrated solution for LED power supplies that simplifies design and helps reduce overall system cost, while providing significant energy savings.

• The new device achieves PWM dimming down to less than 2 percent 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 (250A).

• Efficiencies can exceed 90 percent at higher power levels, for example in a 120W LED street lamp.

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Features• PFC, system control and half-bridge driver in

one IC• Critical-conduction mode boost-type PFC• Programmable PFC over-current protection• Half bridge driver• Half bridge over current protection• Variable frequency oscillator• Fixed internal 1.6us HO and LO dead time• Internal bootstrap MOSFET• Micropower startup (250A)• Latch immunity and ESD protection

April 2011