Products, Materials + Tools | Feb 03, 2014

IR’s IRS2983 LEDrivIR™ Simplifies Design and Reduces Part Count for High Performance Dimming Applications

International Rectifier has introduced the IRS2983 control IC for single stage Flyback and Buck-Boost topologies used in LED drivers and power supplies. The IRS2983 employs primary side regulation that reduces component count and simplifies design by eliminating the opto-isolator and other components necessary for isolated feedback for fixed loads. The device also features a rapid startup circuit that drastically reduces the turn on time of the system.

•   Flyback LED Driver
•   Critical-conduction / Transition mode operation
•   Primary constant power control
•   Burst mode operation at light load
•   Over-current protection
•   Micropower startup (150 µA)
•   Low quiescent current (2.5 mA)
•   Latch immunity and ESD protection
•   Open load over voltage protection
•   Noise immunity

Parameter Value
Family CIC Lighting LED Ballast Controllers
Package 8-lead SOIC
Circuit LED Driver
Offset Voltage (V) 600
Output Source Current min (mA) 200
Output Sink Current min (mA) 400
PbF Yes
V CCUV+ (V) 12.5
V CCUV- (V) 10.5
t off (ns) 330
t r (ns) 60
t f (ns) 30
Qual Level Industrial

The new device also offers high power factor and low THD and operates over a wide input range for many LED lighting applications. Comprehensive protection features including hiccup mode over-voltage protection, cycle-by-cycle over-current protection and open and short circuit protection are also included. The device also supports TRIAC dimming.

As traditional incandescent, halogen, and CFL light sources are rapidly being replaced by LED bulbs, tubes and fixtures, the Flyback converter is the preferred power supply topology for a large segment of the LED driver market. Flyback LED drivers are simple, cost effective and efficient. IR’s IRS2983 helps simplify the design process and reduce part count and can also be configured to work with TRIAC dimmers.

Other key features of the IRS2983 include critical-conduction mode operation, with discontinuous and burst modes at light load as well as flexibility allowing easy connection opto-isolated feedback circuitry for more complex designs.

Available in an SO-8 package, the IRS2983 utilizes IR’s advanced high-voltage IC process to deliver superior protection from electrical over-stress also offering micro-power startup, low quiescent current, latch immunity and ESD protection and noise immunity.

Production quantities are available immediately and the devices are lead free and RoHS compliant. A datasheet is available on the International Rectifier website at

About International Rectifier:
International Rectifier (NYSE:IRF) is a world leader in power management technology. IR’s analog- and mixed-signal ICs, advanced circuit devices, integrated power systems, and components enable high-performance computing and reduce energy waste from motors, the world’s single largest consumer of electricity. Leading manufacturers of computers, energy-efficient appliances, lighting, automobiles, satellites, aircraft, and defense systems rely on IR’s power-management benchmarks to power their next generation products. For more information, go to