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SC2612CMSTR Datasheet(PDF) 8 Page - Semtech Corporation |
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SC2612CMSTR Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 12 page 8 2003 Semtech Corp. www.semtech.com POWER MANAGEMENT SC2612A/C Layout Guidelines Careful attention to layout requirements are necessary for successful implementation of the SC2612 PWM con- troller. High currents switching at high frequency are present in the application and their effect on ground plane voltage differentials must be understood and minimized. 1). The high power parts of the circuit should be laid out first. A ground plane should be used, the number and position of ground plane interruptions should be such as to not unnecessarily compromise ground plane integrity. Isolated or semi-isolated areas of the ground plane may be deliberately introduced to constrain ground currents to particular areas, for example the input capacitor and bottom FET ground. 2). The loop formed by the Input Capacitor(s) (Cin), the Top FET (Q1) and the Bottom FET (Q2) must be kept as small as possible. This loop contains all the high current, fast transition switching. Connections should be as wide and as short as possible to minimize loop inductance. Minimizing this loop area will a) reduce EMI, b) lower ground injection currents, resulting in electrically “cleaner” grounds for the rest of the system and c) minimize source ringing, resulting in more reliable gate switching signals. 3). The connection between the junction of Q1, Q2 and the output inductor should be a wide trace or copper region. It should be as short as practical. Since this con- nection has fast voltage transitions, keeping this con- nection short will minimize EMI. The connection between the output inductor and the output capacitors should be a wide trace or copper area, there are no fast voltage or current transitions in this connection and length is not so important, however adding unnecessary impedance will reduce efficiency. L 12V IN Cout 10uF U1 SC2612 4 7 8 3 6 2 1 5 VCC DH BST FB DL SS/EN COMP GND Q1 10 Vin Vout GND 0.1uF Cin Q2 |
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