A battery charger using TSM101

The TSM101 IC incorporates a high stability series band gap voltage reference, two ORed op amps and a current source.

This IC compares the DC voltage and the current level at the output of a switching power supply to an internal reference. It provides a feedback through an optocoupler to the PWM controller IC in the primary side. The controlled current generator can be used to modify the level of current limitation by offsetting the information coming from the current sensing resistor.

A great majority of low- or medium-end power supplies is voltage regulated by using shunt programmable voltage references like the TL431.

This application note shows how to use the TSM101 IC with a switching mode power supply (SMPS) to realize a battery charger. A 12V Nickel-Cadmium battery charger is given as an example.

View the PDF document for more information.