元器件交易网www.cecb2b.comAOZ1019-EVAEZBuck™ 2A Simple Buck RegulatorEvaluation Board NoteFeatures
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General Description
The AOZ1019 evaluation board is a fully assembled and tested circuit board built with the AOZ1019 buck regulator IC. It outputs a preset or adjustable voltage and up to 2A of continuous current. The evaluation board requires an input voltage from 4.5V to 16V. The output voltage is preset and can be adjusted from 0.8V to VIN–0.4VThe AOZ1019-EVA circuit features include; current limit, short circuit protection, input under voltage lock out,
internal soft start and thermal shut down. It operates at a fixed 500kHz switching frequency. The current mode control and integrated internal MOSFET minimize component count, board area and total cost.
The AOZ1019 comes in an SO-8 package and is rated over a -40°C to +85°C ambient temperature range.
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4.5V to 16V operating input voltage range
Output voltage was preset to 3.3V, adjustable down to 0.8V
2A continuous output current Fixed 500kHz PWM operationInternal soft start
Cycle-by-cycle current limitShort-circuit protectionThermal shutdown
Applications
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Point of load DC/DC conversionPCIe graphics cardsSet top boxes
DVD drives and HDD LCD panelsCable modems
Telecom/networking/datacom equipment
Evaluation Board Schematic
VINC122µF CeramicC61µFVINFrom µPCC5L1 4.7µHENCOMPAOZ1019LXC4R1VOUT+3.3V Output@2AC2, C322µFCeramicRCCCFBAGNDPGNDD1R2Figure 1.
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元器件交易网www.cecb2b.com AOZ1019-EVAComponent List
Ref DesignationC1C2C3C4C5C6CCR1(1)R2RCL1D1U1AOZ1019AIValue22µF22µF22µFNU1000pF1µF1000pF31.6kΩ20kΩ20kΩ4.7µHDescriptionCeramic Cap, 22µF, 25V, 1210, X5RCeramic Cap, 22µF, 25V, 1210, X5RCeramic Cap, 22µF, 25V, 1210, X5RCeramic Cap, 1000pF, 50V, 0603, X7RCeramic Cap, 1µF, 25V, 0603, X5RCeramic Cap, 1000pF, 50V, 0603, X7RThick Film Res, 1%, 31.6k, 0603Thick Film Res, 1%, 20k, 0603Thick Film Res, 1%, 20k, 0603Inductor, 4.7µH, 2.9ASchottky Barrier Diode, 2A, 30V, SMABuck Regulator IC, 2A, 16VManufacturer Part NumberGRM32ER61E226KE15LGRM32ER61E226KE15LGRM32ER61E226KE15LGRM188R71E102KGRM188R61E105KA12DGRM188R71E102KCRCW060331K6FKTAPCRCW060321K0FKTAPCRCW060321K0FKTAPLQH55DN3R3M03B230A-FDICT-NDAOZ1019AIManufacturerMurataDALEMurataDIODESAOSNote: 8+(10×VO)----. Table 1 shows that the value of R1 with typical output voltages. 1. Output voltage is set by R1; R1 = ------------------------------0.8kΩTable 1.VO (V)1.21.82.53.35.0R1 (kΩ)4.9912.721.531.652.3Rev. 1.0 October 2007www.aosmd.comPage 2 of 4
元器件交易网www.cecb2b.com AOZ1019-EVAPCB Layout
Figure 1. Top Silk Screen
Figure 2. Top Layer
Figure 3. Bottom Layer
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元器件交易网www.cecb2b.com AOZ1019-EVAQuick 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 16V.3.Connect EN pin to +VIN or any voltage source which is higher than 2V and less than 16V. 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 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.
This datasheet 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 POLICYALPHA & 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 October 2007www.aosmd.comPage 4 of 4
