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IR's control IC ready to replace magnetic ballasts

02 Sep 2013  | Steve Taranovich

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International Rectifier recently rolled out the IRS2538DS control IC. IR claims that its latest chip is reliable, highly efficient and cost effective for replacing magnetic ballasts used in fluorescent lamps.

The IRS2538DS emulates the behaviour of a magnetic ballast control system, leveraging the company's patented ballast and high-voltage technologies to offer an easy to use, high-performance, cost effective one-chip magnetic replacement ballast solution.

Functional Block Diagram

Available in a compact SO8 package, the IC utilises a novel control method to achieve high power factor with ultra-low THD to eliminate the need for a Power Factor Correction (PFC) stage and electrolytic capacitor at the input. The new IC integrates a 600V half-bridge control circuit, bootstrap MOSFET and comprehensive set of protection features to further reduce component count and PCB area, and increase reliability.

 Application Diagram

Figure 1: Application Diagram.

The device also features preheat, ignition and running lamp modes, closed-loop lamp current control, fixed pre-heat time (2s typical), adaptive deadtime (0.5us to 1.5us typical), lamp insert auto-restart, micropower start-up (125uA) and an internal 15.6V Zener diode clamp on Vcc.

intelligence

Figure 2: State diagram shows intelligence in this solution.




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