Schematic for MC33063 (DFN) step up demoboard L1 150 uH R3 8 1 180 S Q D1 R 100R 2 Oscillator 7 3 Ct Ipk RSC Ct 0.22 Comparator 6 1.25V Vin C4 1.25V Reference Regulator 4 1.5 nF Optional Filter C1 5 100 nF 100 uF L2 MC33063 1 uH R1 2.2k R2 47k C2 C5 100 nF Vout 28V/200mA 330 uF C3 Vout 28V/200mA 100 uF