Tracopower non isolated pol dcdc converter tsrn 1 series tracopower tsrn 1 2490 the tracopower tsrn 1 2490 is a non isolated pol dcdc converter from the tsrn 1 series this step down switching regulator is a drop in replacement for inefficient 78xx linear regulators a high efficiency up to 95 allows full load operation up to 70degc 85degc with derating ambient temperature without the need of any heat sink or forced air cooling the tsrn 1 2490 provides other significant featu