The TSM101 is a voltage and current controller providing a more integrated solution in Switching Mode Power Supply application versus common standard ICs solution, with more functions widely used in power control in a single IC. This application note shows three basic configurations of the IC, to be used in the secondary side of any SMPS. Functions described are precise secondary voltage regulation, current limiting with foldback function, window detector with output feedback to opto-coupler or power good signal to CPU.
The document details how the TSM101 provides an integrated solution for secondary side control in SMPS, offering functions such as precise voltage regulation, current limiting with foldback, and window detection. It presents three basic configurations: single output voltage and current control, dual overvoltage controller for multi-output supplies, and over/undervoltage window comparator.
The TSM101 uses an internal 1.24V voltage reference to achieve voltage regulation.
The overvoltage thresholds are 4.6V for the 5V output and 11.1V for the 12V output.
The good voltage window ranges from 11.5V to 12.5V at the 12V level.