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TPS40322 Datasheet(PDF) 22 Page - Texas Instruments

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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) 22 Page - Texas Instruments

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2
2
2
2
2
2
1
1
1
RIPPLE1
OUT1
RIPPLE1
L1 rms
L1 avg
12
12
12
I
I
I
I
I
10
2.5
10.026 A
=
+
´
=
+
´
=
+
´
=
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D
´
D
D
D
´
<
´ D =
´
=
´
2
OUT1
OUT1
OUT1
OUT1
OVER1
OUT1
OUT1
OUT1
OUT1
OUT1
I
L1
I
I
I
L1
V
t
C
C
V
V
C
(
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(
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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
C
C
V
V
V
V
C
D
´
D
D
D
´
<
´ D =
´
=
-
-
´
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2
2
OUT1
OUT1(min)
OUT
OVER1
I
L1
5
0.88 H
C
458 F
V
V
1.2
40 mV
D
´
´
m
=
=
=
m
´
´
RIPPLE1
RIPPLE1
RIPPLE1
RIPPLE(cap)
OUT1
SW
MAX
RIPPLE1
RIPPLE1
I
2.5 A
V
24 mV
V
V
8
C
f
8
458 F
500 kHz
ESR
9 m
I
I
2.5 A
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´
m
´
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ø
è
ø
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W
(
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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
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´
m
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m
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1
1
OUT1(max)
RIPPLE1
CHARGE
L1 peak
2
2
I
I
I
I
10 A
2.5A
0.281A
11.53 A
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TPS40322
SLUSAF8
– JUNE 2011
www.ti.com
The RMS current through the inductor is approximated by the equation:
(9)
Output Capacitor Selection (C10 through C16)
The selection of the output capacitor is typically driven by the output transient response requirement.
Equation 10and 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.
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 3. Inductor Requirements Summary
PARAMETER
VALUE
UNITS
L1
Inductance
0.88
µH
IL1_RMS
RMS current (thermal rating)
10.026
A
IL1_PEAK
Peak current (saturation rating)
11.53
A
22
Copyright
© 2011, Texas Instruments Incorporated


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