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AOZ1013AI Datasheet(PDF) 10 Page - Alpha & Omega Semiconductors |
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AOZ1013AI Datasheet(HTML) 10 Page - Alpha & Omega Semiconductors |
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10 / 14 page  AOZ1013 Rev. 1.2 October 2009 www.aosmd.com Page 10 of 14 concerns. When designing the compensation loop, converter stability under all line and load condition must be considered. Usually, it is recommended to set the bandwidth to be less than 1/10 of switching frequency. The AOZ1013 operates at a fixed switching frequency range from 350kHz to 600kHz. The recommended crossover frequency is less than 30kHz. The strategy for choosing RC and CC is to set the cross over frequency with RC and set the compensator zero with CC. Using selected crossover frequency, fC, to calculate RC: where; fC is the desired crossover frequency, VFB is 0.8V, GEA is the error amplifier transconductance, which is 200 x 10-6 A/V, and GCS is the current sense circuit transconductance, which is 6.68 A/V. The compensation capacitor CC and resistor RC together make a zero. This zero is put somewhere close to the dominate pole, fP1, but lower than 1/5 of the selected crossover frequency. CC can is selected by: The previous equation can also be simplified to: An easy-to-use application software which helps to design and simulate the compensation loop can be found at www.aosmd.com. Table 3 lists the values for a typical output voltage design when output is 44µF ceramics capacitor. Table 3. Thermal Management and Layout Consideration In the AOZ1013 buck regulator circuit, high pulsing cur- rent flows through two circuit loops. The first loop starts from the input capacitors, to the VIN pin, to the LX pins, to the filter inductor, to the output capacitor and load, and then return to the input capacitor through ground. Current flows in the first loop when the high side switch is on. The second loop starts from inductor, to the output capacitors and load, to the anode of Schottky diode, to the cathode of Schottky diode. Current flows in the second loop when the low side diode is on. In PCB layout, minimizing the two loops area reduces the noise of this circuit and improves efficiency. A ground plane is strongly recommended to connect input capaci- tor, output capacitor, and PGND pin of the AOZ1013. In the AOZ1013 buck regulator circuit, the two major power dissipating components are the AOZ1013, the Schottky diode, and output inductor. The total power dissipation of converter circuit can be measured by input power minus output power. The power dissipation in Schottky can be approximately calculated as: where; VFW_Schottky is the Schottky diode forward voltage drop. The power dissipation of inductor can be approximately calculated by output current and DCR of inductor. The actual junction temperature can be calculated with power dissipation in the AOZ1013 and thermal impedance from junction to ambient is: fC 30kHz = RC fC VO VFB ---------- 2 π CO × GEA GCS × ------------------------------ × × = CC 1.5 2 π RC fP1 × × ----------------------------------- = CC CO RL × RC --------------------- = VOUT L1 RC CC 1.8V 2.2µH 49.9k Ω 1.5nF 3.3V 4.7µH 20k Ω 2.2nF 5V 6.8µH 49.9k Ω 1.2nF 8V 10µH 49.9k Ω 1.2nF Ptotal_loss VIN IIN VO IO × – × = Pdiode_loss IO 1 D – () VFW_Schottky × × = Pinductor_loss IO2 Rinductor 1.1 × × = Tjunction Ptotal_loss Pinductor_loss – () ΘJA × = |
Similar Part No. - AOZ1013AI_09 |
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Similar Description - AOZ1013AI_09 |
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