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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2447 датащи(PDF) 23 Page - Semtech Corporation |
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SC2447 датащи(HTML) 23 Page - Semtech Corporation |
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23 / 26 page  23 © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC2447 PC Board Layout Issues Circuit board layout is very important for the proper operation of high frequency switching power converters. A power ground plane is required to reduce ground bounces. The followings are suggested for proper layout. Power Stage 1) Separate the power ground from the signal ground. In the SC2447, the power ground PGND should be tied to the source terminal of lower MOSFETs. The signal ground AGND should be tied to the negative terminal of the output capacitor. 2) Minimize the size of high pulse current loop. Place the top MOSFET, bottom MOSFET and the input capacitors close to each other with short and wide traces. In addition to the aluminum energy storage capacitors, add multi-layer ceramic (MLC) capacitors from the input to the power ground to improve high frequency bypass. Control Section 1) The frequency-setting resistor R OSC should be placed close to Pin 3. Trace length from this resistor to the analog ground should be minimized. 2) Solder the bias decoupling capacitor right across the AVCC and analog ground AGND. 3) Place the current sensing network away from the power circuit and close to the corresponding CS+ and CS- pins. Use X7R ceramic capacitor for the sensing capacitor because of its temperature stability. 4) Use an isolated local ground plane for the controller and tie it to the negative side of output capacitor bank. Application Information (Cont.) |
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