AOZ1210-EVA EZBuck™ 2A Simple Buck Regulator Evaluation Board Note General Description Features The AOZ1210 evaluation board is a fully assembled and tested circuit board built with the AOZ1210 buck regulator IC. It outputs a preset or adjustable voltage at up to 2A of continuous current. The evaluation board requires an input voltage from 4.5V to 27V. The output voltage is preset and can be adjusted. ● ● ● ● ● The AOZ1210-EVA circuit has features like current limit, short circuit protection, input under voltage lock out, internal soft start and thermal shut down. The current mode control and integrated internal MOSFET minimize component count, board area and total cost. ● ● 4.5V to 27V operating input voltage range Output voltage is preset to 3.3V, adjustable down to 0.8V 2A continuous output current Internal soft start Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Applications ● The AOZ1210 comes in an SO-8 package and is rated over a -40°C to +85°C ambient temperature range. ● ● ● ● ● ● Point of load DC/DC conversion PCIe graphics cards Set top boxes DVD drives and HDD LCD panels Cable modems Telecom/networking/datacom equipment Evaluation Board Schematic C7 C8 C1 R3 VIN BS L1 VOUT EN LX AOZ1210 C6 R1 FB VBIAS C4 GND COMP C2 C3 R2 CC RC Rev. 1.0 December 2007 www.aosmd.com Page 1 of 5 AOZ1210-EVA BOM of 5V/2A AOZ1210 Regulator Ref Designation Value C1 10µF C2 22µF C3 C4 Description Package Manufacturer Ceramic Cap, 50V, X7R/X7R 1210 Murata, AVX Ceramic Cap, 25V, X7R/X5R 1210 22µF Ceramic Cap, 25V, X7R/X5R 1210 1µF Ceramic Cap, 25V, X7R/X5R 0603 Ceramic Cap, 50V, X7R 0603 C5 NC C6 1µF C7 0.1µF Ceramic Cap, 50V, X7R 0603 C8 10µF Ceramic Cap, 50V, X7R/X7R 1210 CC * 2000pF Ceramic Cap, 50V, X7R 0603 RC* 5kΩ Thick Film Res, 1% 0603 R1* 31.6kΩ Thick Film Res, 1% 0603 R2 10kΩ Thick Film Res, 1% 0603 R3 0kΩ Thick Film Res, 1% 0603 L1* 6.8µH D1 U1 AOZ1210A MSS1260 DALE Murata 40V diode, B340B-13 SMB Diodes Buck regulator IC SO-8 AOS VO is set by R1, (R2 = 10kΩ), R1 = (10 x VO–8) / 0.8kΩ *Value may change for different output values. Rev. 1.0 December 2007 www.aosmd.com Page 2 of 5 AOZ1210-EVA PCB Layout Figure 1. Top Silk Screen Figure 2. Top Layer Rev. 1.0 December 2007 www.aosmd.com Page 3 of 5 AOZ1210-EVA Figure 3. Bottom Layer Quick Start Guide 1. Connect the terminals of load to +VOUT pins and GND pins. Set load current to between 0A and 2A. 2. Connect the DC power supply to +VIN pin and GND pins. Set DC power supply voltage to between 4.5V and 27V. 3. Connect EN pin to +VIN or any voltage source which is between 2.5V and 27V. 4. Turn on DC power supply and evaluation circuit will start. 5. Measure input voltage at the +VIN pin and GND pins to eliminate the effect of voltage drop on wire between DC power supply and evaluation board. 6. Measure output voltage at the +VOUT pin and GND pins to eliminate the effect of the voltage drop on wire between load and evaluation board. 7. Use an oscilloscope to monitor input ripple voltage right across input capacitor C1. 8. Use an oscilloscope to monitor output ripple voltage right across output capacitor C2. Rev. 1.0 December 2007 www.aosmd.com Page 4 of 5 AOZ1210-EVA This data sheet contains preliminary data; supplementary data may be published at a later date. Alpha & Omega Semiconductor reserves the right to make changes at any time without notice. LIFE SUPPORT POLICY ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. Rev. 1.0 December 2007 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.aosmd.com Page 5 of 5