Lighting ballast controller
22 June 2011
Power Electronics / Power Management
International Rectifier introduced an IC integrating power factor correction (PFC) and ballast control in a single compact 8-pin SO-8 package. Designed for energy efficient lighting applications, the IRS2580DS Combo8 IC includes a boost converter control circuit operating in critical-conduction, free-running frequency mode to provide power factor correction with low THD.
The device also includes a 600 V half-bridge control circuit working at 50% duty cycle and variable frequency for driving the resonant mode lamp output circuit.
Complete fault protection circuitry is also included for protection against such conditions as mains interrupt or brown-out, lamp non-strike, lamp filament failure and end-of-life. The IRS2580DS requires only two primary control pins to perform all of the necessary ballast functions. These functions include an analog voltage-to-frequency input pin for programming the different operating frequencies for preheating, igniting and running the lamp, and a PWM output pin for controlling the on and off times during each switching cycle of the PFC boost converter.
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