1 2 4 3 D D C1.2 - C1.3 : 500mA ripple current J1 12V C C1.2 C2 C1.1 47uF/50V 0.1uF/25V 22uF/25V 10% (Ceramic) 20% (Ceramic) (Aluminium) C3 C1.3 47uF/50V C (Aluminium) 0.01uF/25V (Ceramic) GND J2 U1 8 7 6 5 L1 128mohm 20% 47uH J3 5.0V/2.0A R5 C4.1 47uF/6.3V (Ceramic) 0 A8499 R3 30.1k D1 40V/3.0A R1 R4 10k 49.9 C4.3 330uF/6.3V (SP) (Aluminium) J4 GND R2 3.16k P1 B C4.2 120uF/6.3V 1 BOOT VIN ENB LX TSET VBIAS GND FB 1 1 2 3 4 P2 B A A Title Application Size: Letter Date: 04/29/05 File: A8499.sch 1 2 Circuit - A8499 Number: 01 Time: 12:53:37 3 Revision: Sheet1 Allegro Microsystems 01 Argentina of 1 4