rev. 1.0 december 2007 www.aosmd.com page 1 of 5 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 ov er a -40? to +85? 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 p oint of load dc/dc conversion pcie graphics cards set top boxes d vd drives and hdd lcd panels cable modems t elecom/networking/datacom equipment evaluation board schematic lx vin bs fb gnd en vbias comp c1 c8 c6 c4 c7 c2 vout c3 r1 r2 l1 aoz1210 r3 r c c c
a oz1210-eva rev. 1.0 december 2007 www.aosmd.com page 2 of 5 bom of 5v/2a aoz1210 regulator v o is set by r1, (r2 = 10k ? ), r1 = (10 x v o ?) / 0.8k ? *value may change for different output values. ref designation v alue description package manufacturer c1 10? ceramic cap, 50v, x7r/x7r 1210 murata, avx c2 22? ceramic cap, 25v, x7r/x5r 1210 c3 22? ceramic cap, 25v, x7r/x5r 1210 c4 1? ceramic cap, 25v, x7r/x5r 0603 c5 nc c6 1? ceramic cap, 50v, x7r 0603 c7 0.1? ceramic cap, 50v, x7r 0603 c8 10? ceramic cap, 50v, x7r/x7r 1210 c c * 2000pf ceramic cap, 50v, x7r 0603 r c *5k ? thick film res, 1% 0603 dale r1* 31.6k ? thick film res, 1% 0603 r2 10k ? thick film res, 1% 0603 r3 0k ? thick film res, 1% 0603 l1* 6.8? mss1260 murata d1 40v diode, b340b-13 smb diodes u1 aoz1210a buck regulator ic so-8 aos
a oz1210-eva rev. 1.0 december 2007 www.aosmd.com page 3 of 5 pcb layout figure 1. top silk screen figure 2. top layer
a oz1210-eva rev. 1.0 december 2007 www.aosmd.com page 4 of 5 figure 3. bottom layer quick start guide 1. connect the terminals of load to +v out pins and gnd pins. set load current to between 0a and 2a. 2. connect the dc power supply to +v in pin and gnd pins. set dc power supply voltage to between 4.5v and 27v. 3. connect en pin to +v in 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 +v in 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 +v out 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 5 of 5 a oz1210-eva 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 f ailure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a signi?ant 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. 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.
|
