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RS6512-33SG Datasheet(PDF) 7 Page - Orister Corporation |
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RS6512-33SG Datasheet(HTML) 7 Page - Orister Corporation |
7 / 10 page Page No. : 7/10 DS‐RS6512‐07 February, 2010 www.Orister.com Output Rectifier Diode The output rectifier diode supplies the current to the inductor when the high‐side switch is off. To reduce losses due to the diode forward voltage and recovery times, use a Schottky diode. Choose a diode whose maximum reverse voltage rating is greater than the maximum input voltage, and whose current rating is greater than the maximum load current. Choose a rectifier who’s maximum reverse voltage rating is greater than the maximum input voltage, and who’s current rating is greater than the maximum load current. Checking Transient Response The regulator loop response can be checked by looking at the load transient response. Switching regulators take several cycles to respond to a step in load current. When a load step occurs, VOUT immediately shifts by an amount equal to ΔILOAD (ESR) also begins to charge or discharge COUT generating a feedback error signal for the regulator to return VOUT to its steady‐state value. During this recovery time, VOUT can be monitored for overshoot or ringing that would indicate a stability problem. Table 1. Suggested Inductors for Typical Application Circuit Component Supplier Series Dimensions (mm) MAGLAYERS MSCDRI‐124‐150M 12 x 12 x 5.0 SUMIDA CDRH104R 10.1 x 10 x 3.0 TOKO D104C 10 x 10 x 4.3 Table 2. Suggested Capacitors for CIN and COUT Component Supplier Part No. Capacitance (uF) Case Size MURATA GRM31CR61E106K 10 1206 TDK C3225X5R1E106K 10 1206 MURATA GRM32ER71C226M 22 1200 TDK C3225X5R1C226M 22 1200 Table 3. Schottky Rectifier Selection Guide 2A Load Current VIN (Max.) Part No. Vendor B320 Diodes, Inc. (www.diodes.com) SK33 Pan Jit International (www.panjit.com.tw) 20V SS32 General Semiconductor (www.gensemi.com) B330 Diodes, Inc. (www.diodes.com) B340L Diodes, Inc. (www.diodes.com) SK33 Diodes, Inc. (www.diodes.com) MBRD330 On Semiconductor (www.onsemi.com) 26V SS33 Fairchild Semiconductor (www.fairchildsemi.com) General Semiconductor (www.gensemi.com) |
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