Schematic for the MC34063 Buck Leaded Demonstration Board h 9/9/2003 MC34063 Evaluation Board Design Example Buck Regulator (12V to 3.3V @ 100mA)(Leaded Version) IC501 MC34063AP1 P501 Vin (+12V) Gnd C501 100uF 25V R501, 1.5, 1/4W R502, Prov., 1/2W 5 Feedback Ground 4 6 Vcc 7 Ipk Sense Timing Cap. 3 Switch Emitter 2 8 Drive Collector Switch Collector 1 C503 270pF R503 Prov., 1/2W R504 Prov., 1/2W C502 0.1uF R505 R506 (Prov.) (Prov.) Q501 (Prov.) R507 (Prov.) R509 2.49K, 1% C504 470uF 16V D501 1N5819 R508 4.12K, 1% Low Current Applications Q501 R505 R506 R507 Out Out Short Out Short Out 1K High Current Applications MPS651 TO-92 L502 Prov. L501 330uH P502 Vout (+3.3V) FB501 (Prov. for FB) C506 Prov. C507 0.1uF Gnd