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APL3534A Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APL3534A Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
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8 / 14 page  Copyright © ANPEC Electronics Corp. Rev. A.1 - Oct., 2013 APL3534/A/B www.anpec.com.tw 8 Application Information Input Capacitor The APL3534/A/B requires proper input capacitance to supply current surge during stepping load transients to prevent the input voltage rail from dropping. Because the parasitic inductor from the voltage sources or other bulk capacitors to the VIN pin limit the slew rate of the surge currents, more parasitic inductance needs more input capacitance. A ceramic input capacitor (0.1 to 10 µF) from V IN to GND, located near the APL3534/A/B, is strongly recommended to suppress the ringing during short circuit fault event. Without the input capacitor, the output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Layout Consideration The PCB layout should be carefully performed to maxi- mize thermal dissipation and to minimize voltage drop, droop and EMI. The following guidelines must be considered: 1. Please place the input capacitors near the VIN pin as close as possible. 2. Output decoupling capacitors for load must be placed near the load as close as possible for decoupling high- frequency ripples. 3. Locate APL3534/A/B and output capacitors near the load to reduce parasitic resistance and inductance for excellent load transient performance. 4. The negative pins of the input and output capacitors and the GND pin must be connected to the ground plane of the load. 5. Keep V IN and VOUT traces as wide and short as possible. Recommanded Minimum Footprit SOT-23-3 0.024 0.037 0.074 Unit : Inch 0.02 0.038 0.076 Unit : Inch SOT-23-5 |
Similar Part No. - APL3534A |
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Similar Description - APL3534A |
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