The LED driver and the 20W LED.
…another watt saved…
A few days ago I posted my driver prototype for a 20 W, 700 mA, 32 V white LED. Under best conditions I reached 85% of power conversion efficiency between the 12 V input…
The prototype unit on perfboard.
Teaching an old bug new tricks
The 78S40 is not one of the most modern switching regulators, together with its small brother the MC34063 it dates back to the 1990's. It differs from the 34063 by…