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TPS65320QPWPRQ1 Datasheet(PDF) 27 Page - Texas Instruments |
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TPS65320QPWPRQ1 Datasheet(HTML) 27 Page - Texas Instruments |
27 / 34 page ![]() GND SW BOOT VIN RT/CLK SS Supply nRST FB1 EN2 3.3V COMP TPS65320-Q1 EN1 Power Pad VI = 3.6V to 40V LDO_OUT VIN_LDO FB2 C1 4.7 F R1 414k C2 3.3nF R4 20k R5 62k R6 20k C6 4.7nF C7 10 F C8(Optional) 33pF D1 5V R3 10k R2 53.6k C3 0.1 F L1 10 H C4 47 F C5 47 F TPS65320-Q1 www.ti.com SLVSAY9A – DECEMBER 2012 – REVISED APRIL 2013 Input Filter Capacitors CI Locate input ceramic filter capacitors in close proximity to the VIN terminal. TI recommends surface-mount capacitors to minimize lead length and reduce noise coupling. Feedback Route the feedback trace such that there is minimum interaction with any noise sources associated with the switching components. The recommended practice is to ensure the inductor is placed away from the feedback trace to prevent creating an EMI noise source. Traces and Ground Plane All power (high-current) traces should be as thick and short as possible. The inductor and output capacitors should be as close to each other as possible. This reduces EMI radiated by the power traces due to high switching currents. In a two-sided PCB, TI recommends having ground planes on both sides of the PCB to help reduce noise and ground loop errors. The ground connection for the input and output capacitors and IC ground should connect to this ground plane. In a multi-layer PCB, the ground plane separates the power plane (where high switching currents and components are) from the signal plane (where the feedback trace and components are) for improved performance. Also, arrange the components such that the switching-current loops curl in the same direction. Place the high-current components such that during conduction the current path is in the same direction. This prevents magnetic field reversal caused by the traces between the two half-cycles, and helps reduce radiated EMI. Other Application Example For a 300-kHz operation, the choices are a 10- μH inductor and a 47-μF × 2 output capacitor. Figure 24. TPS65320-Q1 Design Example With 300-kHz Switching Frequency Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 27 Product Folder Links: TPS65320-Q1 |
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