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RT8525 Datasheet(PDF) 9 Page - Richco, Inc. |
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RT8525 Datasheet(HTML) 9 Page - Richco, Inc. |
9 / 10 page 9 RT8525 DS8525-01 March 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Layout Considerations PCB layout is very important for designing switching power converter circuits. The following layout guides should be strictly followed for best performance of the RT8525. The power components L1, D1, CIN, COUT , M1 and RS must be placed as close as possible to reduce current loop. The PCB trace between power components must be as short and wide as possible. Place components RFB1, RFB2, ROVP1 and ROVP2 close to IC as possible. The trace should be kept away from the power loops and shielded with a ground trace to prevent any noise coupling. The compensation circuit should be kept away from the power loops and should be shielded with a ground trace to prevent any noise coupling. Place the compensation components to the COMP pin as close as possible, no matter the compensation is RC, CC1 or CC2. Figure 5. PCB Layout Guide Figure 4. Derating Curve of Maximum Power Dissipation DRV PGND ISW EN OOVP FB FAULT VDC VIN COMP SS FSW AGND PWMI 2 3 4 5 8 7 6 14 13 12 11 10 9 RC CC1 CC2 PGND VIN CIN VIN RSLP RS M1 COUT D1 L1 VOUT AGND ROVP2 RFB2 ROVP1 RFB1 PGND The compensation circuit should be kept away from the power loops and should be shielded with a ground trace to prevent any noise coupling. Place the power components as close as possible. The traces should be wide and short especially for the high-current loop. The feedback voltage divider resistors must near the feedback pin. The divider center trace must be shorter and avoid the trace near any switching nodes. VOUT AGND is suggested that connect to PGND from the sense resistor RS for better stability. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 0 25 50 75 100 125 Ambient Temperature (°C) Single-Layer PCB |
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