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TPS40322 Datasheet(PDF) 26 Page - Texas Instruments

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) 26 Page - Texas Instruments

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TPS40322
SLUSAF8E – JULY 2011 – REVISED JANUARY 2016
www.ti.com
8.2.1.1 Design Requirements
The design goal parameters are listed in Table 3.
Table 3. TPS40322 Dual Output Design Example Specification
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
INPUT CHARACTERISTICS
VIN
Input voltage
8
12
15
V
VIN(ripple)
Input ripple
IOUT1 = IOUT2 = 10 A
0.25
V
OUTPUT 1 CHARACTERISTICS
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 CHARACTERISTICS
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
8.2.1.2 Detailed Design Procedure
Inductor Selection (L1) through General Device Components show equations and calculations regarding VOUT1.
VOUT2 values can be calculated using similar equations. See Table 4 for the list of materials.
Table 4. Design Example 1, Dual-Output List of Materials
REFERENCE
QTY
DESCRIPTION
PART NUMBER
MFR
DESIGNATOR
Capacitor, Aluminum, 100 µF, 35 V, ±20%, 0.328 x
C1
1
EEV-FK1V101GP
Panasonic - ECG
0.328 inch
C2, C7, C20, C26,
5
Capacitor, Ceramic, 0.1 µF, 50 V, X7R, ±10%, 0603
Std
Std
C39
C3, C35
2
Capacitor, Ceramic, 0.1 µF, 25 V, X5R, ±10%, 0402
Std
Std
C4, C36
2
Capacitor, Ceramic, 1.0 µF, 25 V, X7R, ±10%, 0603
Std
Std
C5, C6, C37, C38
4
Capacitor, Ceramic, 10 µF, 25 V, X5R, ±10%, 0805
Std
Std
C8, C25
2
Capacitor, Ceramic, 33 nF, 16 V, X7R, ±10%, 0603
Std
Std
Capacitor, Ceramic, 470 pF, 25 V, C0G, NP0, ±5%,
C9, C19, C22, C34
4
Std
Std
0603
C10, C27
2
Capacitor, Ceramic, 1.0 µF, 6.3 V, X5R, ±10%, 0402
Std
Std
C11, C12, C18, C28,
5
Capacitor, Ceramic, 3.3 µF, 10 V, X5R, ±10%, 0603
C1608X5R1A335K
TDK Corporation
C29
26
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