International Rectifier (El Segundo, CA) has introduced a control IC for magnetic ballasts used in fluorescent lamps. Available in a compact SO8 package, the IRS2538DS integrates a 600V half-bridge control circuit, bootstrap MOSFET, and protection features. The IRS2538DS also includes pre-heat, ignition, and running lamp modes; closed-loop lamp current control; fixed preheat 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.

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