EVALTSM1052: 3W, 5.1V @ 600mA, 90 ~ 264VAC

This document describes a low power adapter that can be used in travel battery charger applications. It uses the new Constant Voltage Constant Current (CVCC) controller TSM1052, which is housed in one of the smallest packages available (SOT23-6L). Thanks to its low consumption and low operating voltage, good electrical performance is achieved. Another important feature of this SMPS is the absence of the Y1 safety capacitor between primary and secondary grounds.

At primary side a VIPer12A-E has been used. This IC includes a current mode PWM controller and a Power MOSFET in a small SO-8 package. The converter works in both continuous and discontinuous conduction mode depending on the input voltage (the circuit has a wide range input) and the output load. The switching frequency is internally fixed at 60 KHz. The design has been developed to reduce overall component count and adapter cost.