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TPS560200 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza TPS560200
Descripción Electrónicos  4.5-V to 17-V Input, 500-mA Synchronous Step-Down Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS560200 Datasheet(HTML) 10 Page - Texas Instruments

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F
=
P
OUT
OUT
1
2
L
x C
p
OUT
R1 0.8 V
R2 =
V
-0.8V
´
10µF
C4
10µH
L1
10µF
C5
VIN 4.5-17V
VOUT 1.05V, 0.5 A
0.1µF
C2
C3
TPS560200
VIN
4
EN
1
VSENSE
5
GND
2
PH
3
U1
10µF
C1
6.19k
R1
20.0k
R2
open
10
TPS560200
SLVSC81C – SEPTEMBER 2013 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: TPS560200
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS560200 is used as a step-down converter which converts a voltage of 4.5 V to 17 V to a lower voltage.
WEBENCH® software is available to aid in the design and analysis of circuits.
8.2 Typical Application
Figure 7. Typical Application Schematic
8.2.1 Design Requirements
To begin the design process, the user must know a few application parameters:
Table 1. Design Parameters
PARAMETER
VALUES
Input voltage range
4.5 V to 17 V
Output voltage
1.05 V
Output current
500 mA
Output voltage ripple
10 mV/pp
8.2.2 Detailed Design Procedure
8.2.2.1 Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB pin. TI recommends using 1%
tolerance or better divider resistors. Start by using Equation 2 to calculate VOUT.
To improve efficiency at light loads, consider using larger value resistors, high resistance is more susceptible to
noise, and the voltage errors from the VSENSE input current are more noticeable.
(2)
8.2.2.2 Output Filter Selection
The output filter used with the TPS560200 is an LC circuit. This LC filter has double pole at:
(3)


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