The SRK1001 from STMicroelectronics is an Adaptive Synchronous Rectification Controller IC that is designed to provide synchronous rectification (SR) for a secondary side in flyback converters. It requires an input voltage of 3.7 - 32 V. This PMIC utilizes a control scheme to switch on the SR MOSFET as soon as the current starts flowing through its body diode and switches off as the current approaches zero. The innovative adaptive turn-off logic along with the fast turn-on of this PMIC maximizes the conduction time of the SR MOSFET and eliminates the effect of parasitic inductance in the circuit. It enters low power consumption mode when it detects primary controller burst-mode operation, when the DIS pin is pulled up by the user, or when the SR MOSFET conduction falls below the programmed minimum turn-on time, thereby improving the converter efficiency in light load conditions.

The SRK1001 allows the users to program the blanking time after turn-on and after turn-off using two resistors, which ensures flexibility across all kinds of applications while overcoming noise and ringing problems that may arise after turn-on and turn-off events. It is available in a surface-mount package that measures 4.8 x 5.8 x 1.35 mm and is ideal for AC-DC adapters, USB power delivery, industrial SMPS, and battery/quick charging applications.