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TPS54292 Datasheet(PDF) 21 Page - Texas Instruments

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Part # TPS54292
Description  1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54292 Datasheet(HTML) 21 Page - Texas Instruments

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background image
(
)
(
)
OUT
OUT
MAX1
MAX2
IN m in
IN m in
V
V
3.3
1.2
D
0.413
D
0.15
V
8.0
V
8.0
»
=
=
¾¾®
»
=
=
(
)
(
)
OUT
OUT
MIN1
MIN2
IN max
IN max
V
V
3.3
1.2
D
0.236
D
0.086
V
14
V
14
»
=
=
¾¾®
»
=
=
(
)
(
)
Lrip1 max
OUT max
I
0.30 I
0.3 1.5 A
0.450 A
=
´
=
´
=
(
)
(
)
Lrip2 max
OUT max
I
0.30 I
0.3 2.5 A
0.750 A
=
´
=
´
=
(
)
(
)
f
OUT
IN max
MIN1
MIN
SW
LRIP max
V
V
1
14
3.3
1
L
D
0.236
9.35 H
I
0.45 A
600 kHz
-
-
»
´
´
=
´
´
=
m
(
)
(
)
f
OUT
IN m ax
MIN2
MIN
SW
LRIP m ax
V
V
1
14
1.2
1
L
D
0.086
2.45
H
I
0.75 A
600 kHz
-
-
»
´
´
=
´
´
=
m
TPS54290, TPS54291, TPS54292
www.ti.com
SLUS973 – OCTOBER 2009
The list of materials for this application is shown below in Table 2. The efficiency, line regulation and load
regulation from printed circuit boards built using this design are shown in Figure 23 and Figure 24.
Figure 21. TPS54291 Design Example 1 Schematic
Step by Step Design Procedure
Duty Cycle Estimation
The duty cycle of the main switching FET is estimated by Equation 16 and Equation 17.
(16)
(17)
Inductor Selection
The peak to peak ripple should be limited to between 20% and 30% of the maximum output current.
(18)
(19)
The minimum inductor size can be estimated by Equation 20 and Equation 21.
(20)
(21)
The standard inductor values of 8.2 µH and 3.3 µH are selected for Channel 1 and Channel 2 respectively. The
actual ripple currents are estimated by Equation 22 and Equation 23.
Copyright © 2009, Texas Instruments Incorporated
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Product Folder Link(s) :TPS54290 TPS54291 TPS54292


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