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TPS65320QPWPRQ1 Datasheet(PDF) 21 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) 21 Page - Texas Instruments

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background image
(
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out
in _ max
out
ripple
in _ max
o
SW
V
V
V
I
V
L
f
´
-
=
´
´
in _ max
out
out
o min
O
IND
in _ max
SW
V
V
V
L
I
K
V
f
-
=
´
´
´
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
47k
C2
3.3nF
R4
27k
R5
62k
R6
20k
C6
2.7nF
C7
10 F
C8(Optional)
5.4pF
D1
5V
R3
10k
R2
53.6k
C3
0.1 F
L1
2.2 H
C4
22 F
C5
22 F
TPS65320-Q1
www.ti.com
SLVSAY9A – DECEMBER 2012 – REVISED APRIL 2013
Figure 23. TPS65320-Q1 Design Example With 2.2-MHz Switching Frequency
Output Inductor Selection
To calculate the minimum value of the output inductor, use Equation 20. The output capacitor filters the inductor
ripple current. Therefore, choosing high inductor ripple currents impacts the selection of the output capacitor,
because the output capacitor must have a ripple-current rating equal to or greater than the inductor ripple
current. In general, the inductor ripple value is at the discretion of the designer; however, one can use the
following guidelines. KIND is a coefficient that represents the amount of inductor ripple current relative to the
maximum output current.
For designs using low-ESR output capacitors such as ceramics, one can use a value as high as KIND = 0.3.
When using higher-ESR output capacitors, KIND = 0.2 yields better results. In a wide-input voltage regulator, it is
best to choose an inductor ripple current on the larger side. This allows the inductor to still have a measurable
ripple current with the input voltage at its minimum.
For this design example, use KIND = 0.3 and the minimum inductor value calculates to be 1.73 µH. For this
design, the choice is a nearest standard value: 2.2 µH. For the output filter inductor, it is important not to exceed
the rms-current and saturation-current ratings. One can find the rms and peak inductor currents from Equation 22
and Equation 23. The inductor ripple current is 0.71 A, and the rms current is 3.01 A.
For this design, the rms inductor current is 3.01 A and the peak inductor current is 3.36 A. The chosen inductor is
a Coilcraft MSS1038-103NLB. It has a saturation-current rating of 4.52 A and an rms-current rating of 4.05 A. As
the equation set demonstrates, lower ripple current reduces the output ripple voltage of the regulator but requires
a larger value of inductance. Selecting higher ripple currents increases the output ripple voltage of the regulator
but allows for a lower inductance value.
(20)
(21)
Copyright © 2012–2013, Texas Instruments Incorporated
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