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TPS630241YFFT Datasheet(PDF) 16 Page - Texas Instruments

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No. de Pieza. TPS630241YFFT
Descripción  High Current, High Efficiency Single Inductor Buck-Boost Converter
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS630241YFFT Datasheet(HTML) 16 Page - Texas Instruments

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PEAK
Iout
Vin
D
I
=
+
η
(1
D)
2
L
´
´
-
´
´
f
V
- V
IN
OUT
Duty Cycle Boost
D =
V
OUT
TPS63024
TPS630241, TPS630242
SLVSCK8A – NOVEMBER 2014 – REVISED DECEMBER 2014
www.ti.com
10.2.2 Detailed Design Procedure
The first step is the selection of the output filter components. To simplify this process Table 2 outline possible
inductor and capacitor value combinations.
10.2.2.1 Output Filter Design
Table 2. Matrix of Output Capacitor and Inductor Combinations
NOMINAL
NOMINAL OUTPUT CAPACITOR VALUE [µF](2)
INDUCTOR
44
47
66
88
100
VALUE [µH](1)
0.680
+
+
+
1.0
+(3)
+
+
+
+
1.5
+
+
+
(1)
Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by 20% and –30%.
(2)
Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by 20% and –50%.
(3)
Typical application. Other check mark indicates recommended filter combinations
10.2.2.2 Inductor Selection
The inductor selection is affected by several parameter like inductor ripple current, output voltage ripple,
transition point into Power Save Mode, and efficiency. See Table 3 for typical inductors.
Table 3. List of Recommended Inductors(1)
INDUCTOR VALUE
COMPONENT SUPPLIER
SIZE (LxWxH mm)
Isat/DCR
1 µH
Coilcraft XAL4020-102ME
4 X 4 X 2.10
4.5A/10m
1 µH
Toko, DFE322512C
3.2 X 2.5 X 1.2
4.7A/34m
1 µH
TDK, SPM4012
4.4 X 4.1 X 1.2
4.1A/38m
1 µH
Wuerth, 74438334010
3 X 3 X 1.2
6.6A/42.10m
0.6 µH
Coilcraft XFL4012-601ME
4 X 4 X 1.2
5A/17.40m
0.68µH
Wuerth,744383340068
3 X 3 X 1.2
7.7A/36m
(1)
See Third-Party Products Desclaimer
For high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. Especially at
high-switching frequencies, the core material has a high impact on efficiency. When using small chip inductors,
the efficiency is reduced mainly due to higher inductor core losses. This needs to be considered when selecting
the appropriate inductor. The inductor value determines the inductor ripple current. The larger the inductor value,
the smaller the inductor ripple current and the lower the conduction losses of the converter. Conversely, larger
inductor values cause a slower load transient response. To avoid saturation of the inductor, the peak current for
the inductor in steady state operation is calculated using Equation 6. Only the equation which defines the switch
current in boost mode is shown, because this provides the highest value of current and represents the critical
current value for selecting the right inductor.
(5)
(6)
Where,
D =Duty Cycle in Boost mode
f = Converter switching frequency (typical 2.5MHz)
L = Inductor value
η = Estimated converter efficiency (use the number from the efficiency curves or 0.90 as an assumption)
Note: The calculation must be done for the minimum input voltage which is possible to have in boost mode
Calculating the maximum inductor current using the actual operating conditions gives the minimum saturation
current of the inductor needed. It's recommended to choose an inductor with a saturation current 20% higher
than the value calculated using Equation 6. Possible inductors are listed in Table 3.
16
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Product Folder Links: TPS630241 TPS630242


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