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TPS40322 Datasheet(PDF) 28 Page - Texas Instruments

Part # TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 28 Page - Texas Instruments

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background image
(
)
(
)
(
)
1
1
OUT1(max)
RIPPLE1
CHARGE
L1 peak
2
2
I
I
I
I
10 A
2.5A
0.281A
11.53 A
=
+
´
+
=
+
´
+
=
(
)
OUT1
OUT1
CHARGE
SS
1.2 V
2
220 F
2
10 F
2
3.3 F
1 F
V
C
I
0.281A
t
2ms
´
´
m + ´
m + ´
m + m
´
=
=
=
RIPPLE1
RIPPLE1
RIPPLE1
RIPPLE(cap)
OUT1
SW
MAX
RIPPLE1
RIPPLE1
I
2.5 A
V
24mV
V
V
8 C
f
8 458 F 500kHz
ESR
9m
I
I
2.5 A
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ö
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-
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m ´
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ø
è
ø
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=
=
=
W
(
)
2
2
OUT1
OUT1(min)
OUT
OVER1
I
L1
5
0.88 H
C
458 F
V
V
1.2 40mV
D
´
´
m
=
=
=
m
´
´
(
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2
OUT1
OUT1
OUT1
OUT1
UNDER1
OUT1
OUT1
IN
OUT1
IN
OUT1
OUT1
I
L1
I
I
I
L1
V
t
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V
V
V
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OUT1
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TPS40322
SLUSAF8E – JULY 2011 – REVISED JANUARY 2016
www.ti.com
8.2.1.2.3
Output Capacitor Selection (C10 through C16)
The selection of the output capacitor is typically driven by the output transient response requirement. Equation 10
and Equation 11 over-estimate the voltage deviation to account for delays in the loop bandwidth and can be used
to determine the required output capacitance:
(10)
(11)
When VIN(min) > 2 x VOUT1, use the overshoot equation, VOVER1, to calculate minimum output capacitance. When
VIN(min) < 2 x VOUT1 use Equation 11, VUNDER1, to calculate minimum output capacitance. In this design example,
VIN(min) is much larger than 2 x VOUT1 so Equation 12 is used to determine the required minimum output
capacitance.
(12)
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated by Equation 13.
(13)
Two 220-µF, 4-V, aluminum electrolytic capacitors were chosen for load response requirements. Additionally two
0805 10-µF, X7R, along with two 0603, 3.3-µF X5R, and one 1-µF, X5R ceramic capacitors are selected for low
ESR and high frequency decoupling.
8.2.1.2.4
Peak Current Rating of Inductor
With the output capacitance known, it is possible to calculate the charge current during start-up and determine
the minimum saturation current rating for the inductor. The start-up charging current is approximated using
Equation 14.
(14)
(15)
Table 5. Inductor Requirements Summary
PARAMETER
VALUE
UNIT
L1
Inductance
0.88
µH
IL1_RMS
RMS current (thermal rating)
10.026
A
IL1_PEAK
Peak current (saturation rating)
11.53
A
A 744314110 from Wurth Electronics with 1.1-µH zero current inductance is selected. Inductance for this part is
0.88-µH at 10-A bias. This 15-A, 3.15-m
Ω inductor exceeds the minimum inductor ratings in a 7-mm x 7-mm
package.
8.2.1.2.5
Input Capacitor Selection (C3 through C6)
The input voltage ripple is divided between the capacitance and ESR of the input capacitor. For this design
VRIPPLE(cap) = 200 mV and VRIPPLE(esr) = 50 mV. The minimum capacitance and maximum ESR are estimated
using Equation 16.
28
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