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ADI Launches Pulse Width Modulation Controller to Enhance System Stability
Published2017.09.22 11:29
Analog Devices (ADI) has launched three pulse width modulation (PWM) controller products based on ADI's award-winning iCoupler technology.
This product family supports integrated isolation of 5kV and includes the ADP1071-1 and ADP1072-2 isolated synchronous flyback controllers, and the ADP1074 isolated synchronous active clamp forward controller. The product family integrates multiple functions that would otherwise require discrete components, including overvoltage protection (OVP), output tracking, light load mode for high energy efficiency, and SR driver, reducing board space by 35% compared to conventional methods using optocouplers and significantly improving system stability.
The new PWM controller is designed for isolated universal input offline, industrial and telecom power supplies, and isolated DC/DC power supplies used in these applications. It also provides secondary-side communication functionality utilizing PGOOD, resolving common constraints that arise with isolation while reducing the number of external components.
The new device uses a unique approach that combines primary and secondary-side controllers with iCoupler isolation technology integrated into a single easy-to-use package. It implements effective secondary-side sensing within a single package while providing all the advantages of both primary and secondary-side controllers. Additionally, the iCoupler technology integrated into the device has improved bandwidth by 5 times for superior transient response performance, and also reduced output capacitance by more than 20%.
The ADP1071-1 and ADP1072-2 are fixed-frequency PWM current-mode synchronous flyback controllers designed for isolated DC/DC power supplies. ADI's proprietary iCoupler technology is integrated within the PWM controller, replacing bulky signal transformers and optocouplers while reducing system design complexity, cost, and component count, and improving overall system stability.
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