AP1501(A)-EV Application Note AP1501(A) Application Information and Demo Board User Guide Contents 1. Description 2. Schematic 3. EVM Board and Efficiency 4. PCB Layout 5. Bill of Materials 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. 1/4 Rev. A MAY 2010 www.diodes.com Diodes Incorporated AP1501(A)-EV Application Note AP1501(A) Application Information and Demo Board User Guide 1. Description The AP1501/A are a fully integrated step-down DC/DC converter, with the ability to drive 3A/5A load without the need of additional driver components. The AP1501/A 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 VIN=12V VOUT=5V/3A AP1501 J3 5 Vin SD C2 OUTPUT FB 2 1 2 47uH D1 B340A 4 R2 3K R1 option C5 option 3 C1 C4 1 Open 2 L1 GND 1 C7 C3 0.1u 470uF ON/OFF 470uF 0.1u R4 Open C6 R3 1K option VIN=12V VOUT=5V/5A AP1501A J3 5 C2 Vin SD L1 OUTPUT FB 2 1 2 22uH D1 B540C 4 R2 3K R1 option C5 option 3 C1 C4 1 Open 2 GND 1 C7 C3 0.1u 470uF ON/OFF 470uF 0.1u R4 Open C6 option R3 1K Figure 1. AP1501(A) schematic Note : VOUT = VFB * (1+R2/R3) VFB=1.23V R3 = 1K ~ 3K 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. 2/4 Rev. A MAY 2010 www.diodes.com Diodes Incorporated AP1501(A)-EV Application Note AP1501(A) Application Information and Demo Board User Guide 3. EVM board and Efficiency 4. 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. 3/4 Rev. A MAY 2010 www.diodes.com Diodes Incorporated AP1501(A)-EV Application Note AP1501(A) Application Information and Demo Board User Guide 5. Bill of Materials For AP1501 Component Quantity Location Specification Mark Maker Part No. Size C1,C3 2 470uF/25V (Aluminum Capacitors) G-LUXON C2,C7 2 Ceramic capacitor 0.1uF/50V,Y5V TAIYO YUDEN UMK107F104ZA-T C0603 L1 1 47uH/3A Wurth Electronics 744132 21X9.5 R2 1 3K(1%) YAGEO R0805 R3 1 1K(1%) YAGEO R0805 R4 1 Short - - R0805 D1 1 Schottky diode 40V 3A* Diodes B340A SMA U1 1 150KHz, 3A PWM buck converter* Diodes AP1501 TO263-5L Vin, Vout 4 HEADER_1 - - 2X2X13 Specification Mark Maker Part No. Size 10X15 For AP1501A Component Quantity Location C1,C3 2 470uF/25V (Aluminum Capacitors) G-LUXON C2,C7 2 Ceramic capacitor 0.1uF/50V,Y5V TAIYO YUDEN UMK107F104ZA-T C0603 L1 1 22uH/5A Wurth Electronics 744150 28.5X14.5 R2 1 3K(1%) YAGEO R0805 R3 1 1K(1%) YAGEO R0805 R4 1 Short - - R0805 D1 1 Schottky diode 40V 5A* Diodes B540C SMC U1 1 150KHz, 5A PWM buck converter* Diodes AP1501A TO263-5L Vin, Vout 4 HEADER_1 - - 2X2X13 10X15 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. 4/4 Rev. A MAY 2010 www.diodes.com Diodes Incorporated