AOZ1210-EVA

AOZ1210-EVA EZBuck™ 2A Simple Buck Regulator Evaluation Board Note General Description 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. The AOZ1210 comes in an SO-8 package and is rated over a -40°C to +85°C ambient temperature range. Features ● ● ● ● ● ● ● 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 ● ● ● ● ● ● ● 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 EN C6 BS L1 VOUT LX AOZ1210 VBIAS C4 R1 FB GND R2 C2 C3 COMP CC RC Rev. 1.0 December 2007 www.aosmd.com Page 1 of 5 AOZ1210-EVA BOM of 5V/2A AOZ1210 Regulator Ref Designation C1 C2 C3 C4 C5 C6 C7 C8 CC * RC* R1* R2 R3 L1* D1 U1 AOZ1210A Value 10µF 22µF 22µF 1µF NC 1µF 0.1µF 10µF 2000pF 5kΩ 31.6kΩ 10kΩ 0kΩ 6.8µH Description Ceramic Cap, 50V, X7R/X7R Ceramic Cap, 25V, X7R/X5R Ceramic Cap, 25V, X7R/X5R Ceramic Cap, 25V, X7R/X5R Ceramic Cap, 50V, X7R Ceramic Cap, 50V, X7R Ceramic Cap, 50V, X7R/X7R Ceramic Cap, 50V, X7R Thick Film Res, 1% Thick Film Res, 1% Thick Film Res, 1% Thick Film Res, 1% MSS1260 40V diode, B340B-13 Buck regulator IC Package 1210 1210 1210 0603 0603 0603 1210 0603 0603 0603 0603 0603 Manufacturer Murata, AVX DALE Murata SMB SO-8 Diodes 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. 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. Rev. 1.0 December 2007 www.aosmd.com Page 5 of 5