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STMicroelectronics’ L6591 PWM controller demonstrates optimization for zero-voltage switching asymmetrical half-bridge converters. The device enables efficiencies of 85% min. at 500 kHz, implements pulse skipping under light-load and no-load conditions, and has a quiescent current of <3 mA. The controller includes a PFC interface, compliance for the International Energy Authority’s 1 W plan for standby power, pulse-by-pulse over-current protection for false tripping, overload protection with latched or auto restart behavior, and transformer-saturation detection. The SO16N-packaged device implements adaptive UVLO.

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