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BD9P105MUF-CE2 Fiches technique(PDF) 48 Page - Rohm |
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BD9P105MUF-CE2 Fiches technique(HTML) 48 Page - Rohm |
48 / 60 page 48/57 © 2019 ROHM Co., Ltd. All rights reserved. 28.Apr.2020 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5MUF-C Series TSZ02201-0J1J0AL01500-1-2 PCB Layout Design PCB layout design for DC/DC converter power supply IC is as important as the circuit design. Appropriate layout can avoid various problems caused by power supply circuit. Figure 89 (a) to Figure 89 (c) figure the current path in a buck converter circuit. The Loop1 in Figure 89 (a) is a current path when High Side Switch is ON and Low Side Switch is OFF, the Loop2 in Figure 89 (b) is when High Side Switch is OFF and Low Side Switch is ON. The thick line in Figure 89 (c) shows the difference between Loop1 and Loop2. The current in thick line changes sharply each time the switching element High Side Switch and Low Side Switch change from OFF to ON, and vice versa. These sharp changes induce several harmonics in the waveform. Therefore, the loop area of thick line that is consisted by input capacitor and IC should be as small as possible to minimize noise. For more detail, refer to application note of switching regulator series “PCB Layout Techniques of Buck Converter”. CIN High Side Switch COUT VOUT L VIN Loop1 Low Side Switch GND GND Figure 89 (a). Current Path when High Side Switch = ON, Low Side Switch = OFF CIN COUT VOUT L VIN Loop2 High Side Switch Low Side Switch GND GND Figure 89 (b). Current Path when High Side Switch = OFF, Low Side Switch = ON CIN High Side FET COUT VOUT L VIN GND GND Low Side FET Figure 89 (c). Difference of Current and Critical Area in Layout |
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