6 5 4 3 2 1 F3 REVISION RECORD LTR ECO NO: APPROVED: DATE: D D VSW C C U1 NCP3170A 1 2 VIN 3 C1 NI Vin C8 NI C2 22uF 25V C3 0.01uF 25V 4 PGND VIN AGND FB VSW PG EN COMP LOUT 4.7uH 8 6 R4 20R EN-2 VIN BODE EN-1 5 R3 100k COMP GND_IN VOUT PG 7 R1 24.9k RC 4.99k GND_I CC 6.8n 25V CF 150pF 10V C4 22uF 25V C5 22uF 25V C6 NI C7 NI CHF 820pF 50V Vout RF 1k CP NI FB GND GND R2 7.87k B B COMPANY: A ON Semiconductor A TITLE: DRAWN: Bryan W McCoy CHECKED: Andrew Knoop F1 F2 NCP3170 Reference Design 1 DATED: 03/18/11 DATED: 03/18/11 QUALITY CONTROL: DATED: RELEASED: DATED: CODE: SIZE: DRAWING NO: REV: C SCALE: 6 SHEET:1 OF 1