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TPS54325PWP Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS54325PWP
Description  4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFT??
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS54325PWP Datasheet(HTML) 11 Page - Texas Instruments

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DESIGN GUIDE
Step By Step Design Procedure
Output Inductor Selection
L =
O
− −
V
OUT
V
IN(max)
V
V
IN(max)
OUT
-
I
f
Kind
OUT
SW
(2)
Ilp-p=
V
OUT
V
IN(max)
V
-V
IN(max)
OUT
L
f
O
SW
(3)
I
=I +
lpeak
O
Ilp-p
2
(4)
I
=
Lo(RMS)
I +
O
2
1
12
Ilp-p
2
(5)
Output Capacitor Selection
C
O >
1
8
f
SW
1
V
O(ripple)
I
(ripple)
R
ESR
(
)
-
(6)
R
ESR
<
V
O(ripple)
I
l(ripple)
(7)
I
=
CO(RMS)
V
OUT
(
)
V-V
IN
OUT
V
IN
L
O
f
SW
√12
(8)
Input Capacitor Selection
TPS54325
www.ti.com ................................................................................................................................................................ SLVS932A – MAY 2009 – REVISED JULY 2009
To begin the design process, you must define these parameters for your application as follows:
• Input voltage range
• Output voltage
• Output current
• Output voltage ripple
• Input voltage ripple
The inductance value is selected to provide approximately 30% peak to peak ripple current at maximum load.
Larger ripple current increases output ripple voltage, improves S/N ratio and contributes to stable operation.
Smaller ripple currents result in lower output voltage ripple. When using low ESR output capacitors output ripple
voltage is usually low, so larger ripple currents are acceptable. The coefficient Kind represents the percentage of
ripple current. The value of Kind must not be greater than 0.4. Use 0.3 when using low ESR output capacitors.
Equation 2 can be used to calculate L1. Use 700 kHz for fSW. Make sure the chosen inductor is rated for the
peak current of Equation 4 and the RMS current of Equation 5.
The capacitor value and ESR determines the amount of output voltage ripple. Recommended to use ceramic
output capacitor. Using Equation 6 to Equation 8, an initial estimate for the capacitor value, ESR, and RMS
current can be calculated. If the load transients are significant consider using the load step, instead of ripple
current to calculate the maximum ESR. Minimum CO should be over 20 µF.
The TPS54325 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A ceramic capacitor over 10
µF is recommended for the decoupling capacitor. The capacitor voltage
rating needs to be greater than the maximum input voltage. In case of separate VCC and VIN, then a ceramic
capacitor over 10
µF is recommended for the V
IN and also placing ceramic capacitor over 0.1 µF for the VCC is
recommended.
Copyright © 2009, Texas Instruments Incorporated
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