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SC441AEVB Datasheet(PDF) 17 Page - Semtech Corporation |
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SC441AEVB Datasheet(HTML) 17 Page - Semtech Corporation |
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17 / 20 page  SC441A 7 © 2009 Semtech Corporation www.semtech.com Layout Guidelines The SC44A contains a boost converter and the place- ments of the power components outside the SC44A should follow the layout guidelines of a general boost converter. The evaluation application circuit on page 7 will be used as an example. C2 and C3 are input decou- pling capacitor for SC44A VIN pin and main power input. C2,C3 should be placed as close as possible to the VIN pin to achieve the best decoupling performance. To minimize the switching noise, The switching loop formed by input decoupling capacitors, internal switch, output Schottky diode and output capacitors must be minimized. The LED current programming resistor(R6), compensation network (R9,C5,C7) and soft start capacitor (C6) should be placed as close as possible to SC44A. The C4~C7 are decoupling capacitors for LED current source which prevent IO pins from noise influence. C4~C7 should be placed close to each corresponding IO pin. Use an isolated local AGND plane underneath the con- troller and tie it to the negative side of output capacitor through R4 for better noise immunity. Applications Information (continued) |
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