DESCRIPTION
IN-PLUG® IPS20 & IPS21 Integrated Circuits are low-voltage current sensing feedback controllers used in Switch Mode Power Supplies to control load-side current and voltage. They have been designed to limit the power dissipated in the sensing circuitry for high output current applications that require current limiting. They also provide excellent loop stability and superb transient response. They both incorporate a 4V shunt regulator for maximum flexibility to power the chip. The IPS20 and IPS21 only differ by the characteristics of the current sensing references. The IPS20 incorporates a trimmed 50mV reference with a positive temperature coefficient which closely matches that of a PCB copper trace. This copper trace sensing method can be used inexpensively with very low associated power losses. The IPS20 and IPS21 are suitable for any SMPS and any make of SMPS controllers, including flyback, forward, PFC and DC/DC solutions. These flyback controllers work best in complement with the IN-PLUG® family of IPS1x flyback controllers, IPS10x PFC controllers and IPS20x PushPull controllers.
