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TPS65320QPWPRQ1 Datasheet(PDF) 27 Page - Texas Instruments

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Part # TPS65320QPWPRQ1
Description  40-V Step-Down Converter With Eco-mode??Codec and LDO Regulator
Download  34 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS65320QPWPRQ1 Datasheet(HTML) 27 Page - Texas Instruments

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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
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