Intersil has introduced a current mode PWM controller for applications requiring isolated active clamp forward and asymmetric half-bridge converter topologies, such as power systems in telecomms and datacomms equipment. The company claims that the ISL6726 PWM controller enhances circuit reliability through a duty cycle clamp feature that reduces voltage stress on external components. The PWM controller incorporates adjustable peak current limit and average current limit protection and includes both types of protection to ensure that the output current is within a safe operating range. The company claims that the average current limit function provides good overload operation for applications requiring parallel or redundant converters and constant current applications such as battery chargers or LED drivers. The controller incorporates a bi-directional synchronisation option with 180° phase shift that enables interleaved topologies. According to the company, interleaving reduces RMS input current and also simplifies thermal management. The controller also includes soft-start and soft-stop functionalities, and restricts electrical stress during the start-up and shut-down process. It also provides duty cycle and deadtime control functionalities. The PWM controller is available in a 20pin quarter small-outline package.
