The IRS2980 is the latest addition to IR’s range of Buck controllers complementing the existing IRS25401/11 series for non-isolated LED driver applications. The IRS2980 includes a high voltage regulator which enables the IRS2980 to be supplied directly from the input voltage bus and differential high side current sensing enabling the use of a single MOSFET and ultra-fast diode as well as maximum frequency limiting. These improvements provide design simplifcation and cost saving while being able to operate up to 450V with adequate thermal relief. A PWM dimming interface is also incorporated making the IRS2980 a versatile low cost LED driver solution.
Applications include LED bulb replacement, indoor and outdoor signage as well as architectural, entertainment design and decorative lighting.
The IRS2980 and IRS25401/11 operate in continuous conduction mode using hysteretic average current control.

FEATUREs
• Internal high voltage regulator
• Hysteretic current control
• High side current sensing
• PWM dimming with analog or PWM   control input
• Free running frequency with maximum   limiting (150kHz)

Benefts
• Low component count
• Off-line operation
• Very simple design
• Inherent stability
• Inherent short circuit protection