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TPS40322 Datasheet(PDF) 21 Page - Texas Instruments

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Part No. 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) 21 Page - Texas Instruments

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IN(max)
OUT1
OUT1
OUT1
IN(max)
SW
V
V
V
1
15 V
1.2 V
1.2 V
1
L1
0.736 H
0.3
I
V
f
0.3
10 A
15 V
500 kHz
-
-
»
´
´
=
´
´
=
m
´
´
TPS40322
www.ti.com
SLUSAF8
– JUNE 2011
TPS40322 Design Example 1
Dual-Output Configuration from 12-V Nominal to 1.2-V and 1.8-V DC-to-DC Converter Using the
TPS40322
The following example illustrates the design process and component selection for a dual output synchronous
buck converter using the TPS40322 controller. The design goal parameters are listed in Table 2.
Table 2. TPS40322 Dual Output Design Example Specification
PARAMETER
TEST CONDITION
MIN
NOM
MAX
UNIT
INPUT CHARACTERSTICS
VIN
Input voltage
8
12
15
V
VIN(ripple)
Input ripple
IOUT1 = IOUT2 = 10 A
0.25
V
OUTPUT 1 CHARACTERSTICS
VOUT1
Output voltage
IOUT1(min) ≤ IOUT1 ≤ IOUT1(max)
1.2
V
Line regulation
VIN(min) ≤ VIN ≤ VIN(max)
0.5%
Load regulation
IOUT1(min) ≤ IOUT1 ≤ IOUT1(max)
0.5%
VRIPPLE1
Output ripple
IOUT1 = IOUT1(max)
24
mV
VOVER1
Output overshoot
ΔIOUT1 = 5 A
40
mV
VUNDER1
Output undershoot
ΔIOUT1 = 5A
40
mV
IOUT1
Output current
VIN(min) ≤ VIN ≤ VIN(max)
0
10
A
ISCP1
Short circuit current trip point
15
A
OUTPUT 2 CHARACTERSTICS
VOUT2
Output voltage
IOUT2(min) ≤ IOUT2 ≤ IOUT2(max)
1.8
V
Line regulation
VIN(min) ≤ VIN ≤ VIN(max)
0.5%
Load regulation
IOUT2(min) ≤ IOUT2 ≤ IOUT2(max)
0.5%
VRIPPLE2
Output ripple
IOUT2 = IOUT2(max)
36
mV
VOVER2
Output overshoot
ΔIOUT2 = 5 A
40
mV
VUNDER2
Output undershoot
ΔIOUT2 = 5 A
40
mV
IOUT2
Output current
VIN(min) ≤ VIN ≤ VIN(max)
0
10
A
ISCP2
Short circuit current trip point
15
A
GENERAL CHARACTERSTICS
tSS
Soft-start time
VIN = 12 V
2
ms
η
Efficiency
VIN = 12 V, IOUT1= IOUT2 = 10 A
88%
fSW
Switching frequency
500
kHz
Design Procedure
Equations and calculations are shown regarding VOUT1. VOUT2 values can be calculated using similar equations.
Selecting a Switching Frequency
To maintain acceptable efficiency and meet minimum on-time requirements, a 500kHz switching frequency is
selected.
Inductor Selection (L1)
Synchronous BUCK power inductors are typically sized for approximately 20% - 40% peak-to-peak ripple current
(IRIPPLE). Given a target ripple current of 30%, the required inductor size, at maximum rated output current, can
be calculated using Equation 8.
(8)
Selecting a standard, readily available inductor, with a rated inductance is 0.88
µH at 10 A, IRIPPLE1 = 2.5 A
Copyright
© 2011, Texas Instruments Incorporated
21


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