Products, Materials + Tools | Apr 15, 2011

IR’s IRS2548D LED Control IC Increases Efficiency, Simplifies Design and Reduces Overall System Cost

International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced the IRS2548D Switched Mode Power Supply (SMPS) control IC for energy efficient applications for high power Light Emitting Diode (LED) illumination including 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 percent efficiency for a 40 V / 1.3 A HBLED load to deliver a higher efficiency solution compared to alternative Flyback converter solutions at power levels above 60 W.

“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,” said, Peter Green, LED Group Manager, IR’s Energy Saving Products Business Unit.

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 (250µA).

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 deadtime
• Internal bootstrap MOSFET
• Internal 15.6V zener clamp diode on Vcc
• Micropower startup (250μA)
• Latch immunity and ESD protection

Typical Applications:
• Isolated LED Drivers
• Power Supplies

Specifications:

Part Number

Package

VOFFSET
(V)

VOUT

IO+ & IO-
(Typical)

tON & tOFF
(Typical)

Deadtime
(Typical)

IRS2548D SO-14 600 VCC 500mA/ 500mA 120nS/ 50nS

1.6uS

Design Tools:
A datasheet and application note are available on the International Rectifier website at www.irf.com/. In addition, the IRPLLED5 reference design kit, featuring the IRS2548D.

Availability and Pricing:
Pricing for the IRS2548D begins at US $1.45 each in quantities of 10,000-units. Production quantities are available immediately. The devices are lead free and RoHS compliant. Prices are subject to change.

About IR:
International Rectifier (IR) (Symbol:IRF--NYSE) is a pioneer and world leader in advanced power management technology, from digital, analog and mixed-signal ICs to advanced circuit devices, power systems and components. The world's leading manufacturers of computers, appliances, automobiles, consumer electronics and defense systems rely on IR technology to drive the performance and efficiency of their products. Today, power management technology plays a more important role than ever in saving the world's dwindling energy reserves while tackling tough technology roadblocks.

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