AP1509-EV Application Note AP1509 Application Information and Demo Board User Guide Contents 1. Description 2. Schematic 3. PCB Layout 4. Bill of Materials 5. Vendors of peripheral components This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. 1/3 Rev. A Apr. 2011 www.diodes.com Diodes Incorporated AP1509-EV Application Note AP1509 Application Information and Demo Board User Guide 1. Description The AP1509 are a fully integrated step-down DC/DC converter, with the ability to drive 2A load without the need of additional driver components. The AP1509 operates at a switching frequency of 150KHZ enabling the use of small size filter components. As a result, board space is reduced and BOM costs are lowered. 2. EVM Schematic Figure 1. AP1509 schematic VOUT = VFB * (1+R2/R3) VFB=1.23V R3 = 1K ~ 3K 3. Board Layout Top Layer Bottom Layer This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. 2/3 Rev. A Apr. 2011 www.diodes.com Diodes Incorporated AP1509-EV Application Note AP1509 Application Information and Demo Board User Guide 4. Bill of Materials Component Location C1,C3 C2,C7 Qty Value Source Part No. Size 2 2 Aluminum Cap 470uF/25V Cap MLCC 0.1uF/50V/X5R TEAPO TAIYO YUDEN UMK212BJ104KG-T 10X15 C0805 L1 1 47uH/3A Wurth Electronics 7447 series 12X12X8mm R4 D1 1 1 Diodes B340 R0805 SMC U1 1 Diodes AP1509 SOP-8L Vin, Vout 4 - - 2X2X13mm PCB 1 Short Schottky diode 40V/3A 150KHz, 2A PWM buck converter HEADER_1 AP1501/6/9/18/19 Buck Regulator V1.1 Diodes Inc. TDB0007 2160X1540mil The recommended components for adjustable output versions： ： VOUT(V) R2(kΩ, 1%) R3(kΩ, 1%) L1(µH) 2.5 1 1 39 3.3 5 3 47 5 3 1 47 12 13 1.5 47 The recommended components for fixed output versions： ： VOUT(V) R2(kΩ, 1%) R3(kΩ, 1%) L1(µH) 3.3 Short NC 47 5 Short NC 47 12 Short NC 47 5. Vendors of peripheral components ： Suggested Capacitors for C1 and C3 Vendor Capacitance TEAPO Aluminum Cap 470uF/25V Suggested Capacitors for C2 and C7 Type DIP Series Vendor TAIYO YUDEN Suggested Resistor Type SMD Series UMK212BJ104KG-T ： ： Capacitance Cap MLCC 0.1uF/50V/X5R Vendor YAGEO Suggested Inductor Type SMD Series RC0805FR-SK Vendor Wurth Electronics Type SMD Series 7447 series ： This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. 3/3 Rev. A Apr. 2011 www.diodes.com Diodes Incorporated