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TPS40322 Datasheet(PDF) 27 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) 27 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
=
+
´
=
+
´
=
+
´
=
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
500kHz
-
-
»
´
´
=
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m
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TPS40322
www.ti.com
SLUSAF8E – JULY 2011 – REVISED JANUARY 2016
Table 4. Design Example 1, Dual-Output List of Materials (continued)
REFERENCE
QTY
DESCRIPTION
PART NUMBER
MFR
DESIGNATOR
C13, C14, C30, C31
4
Capacitor, Ceramic, 10 µF, 6.3 V, X7R, ±10%, 0805
Std
Std
Capacitor, Polymer Aluminum, 220 µF, 4 V, ±20%, 5 m
Ω
C15, C16, C32, C33
4
EEF-SE0G221ER
Panasonic - ECG
ESR
Capacitor, Ceramic, 220 pF, 50 V, C0G, NP0, ±5%,
C17, C23
2
Std
Std
0603
C21, C24
2
Capacitor, Ceramic, 10 pF, 50 V, C0G, NP0, ±5%, 0603
Std
Std
C40
1
Capacitor, Ceramic, 1.0 nF, 25 V, C0G, NP0, ±5%, 0603
Std
Std
Inductor, Power Choke, 1.1 µH, ±20%, 3.15 m
Ω, 7.0 mm
L1, L2
2
744314110
Wurth Elektronik
x 6.9 mm
MOSFET, Synchronous Buck NexFET Power Block,
Q1, Q2
2
CSD86330Q3D
Texas Instruments
QFN-8 POWER
R1
1
Resistor, Chip, 68.1 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R2, R21
2
Resistor, Chip, 86.6 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R3
1
Resistor, Chip, 12.7 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R4, R5, R22
3
Resistor, Chip, 1.00
Ω, 1/10 W, ±1%, 0603
Std
Std
R6
1
Resistor, Chip, 40.2 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R7, R24
2
Resistor, Chip, 49.9
Ω, 1/10 W, ±1%, 0603
Std
Std
R8, R17
2
Resistor, Chip, 5.11
Ω, 1/8 W, ±1%, 0805
Std
Std
R9, R16
2
Resistor, Chip, 0
Ω, 1/10 W, ±1%, 0603
Std
Std
R10, R14, R19, R27
4
Resistor, Chip, 20.0 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R11, R18
2
Resistor, Chip, 82.5 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R12, R23
2
Resistor, Chip, 1.62 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R13
1
Resistor, Chip, 3.09 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R15
1
Resistor, Chip, 29.4 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R20, R30
2
Resistor, Chip, 5.11
Ω, 1/10 W, ±1%, 0603
Std
Std
R25
1
Resistor, Chip, 10.0 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R26
1
Resistor, Chip, 3.24 k
Ω, 1/10 W, ±1%, 0603
Std
Std
R28, R29
2
Resistor, Chip, 100 k
Ω, 1/10 W, ±1%, 0603
Std
Std
U1
1
TPS40322 Dual Synchronous Buck Controller, QFN-32
TPS40322RHB
Texas Instruments
8.2.1.2.1
Selecting a Switching Frequency
To maintain acceptable efficiency and meet minimum on-time requirements, a 500-kHz switching frequency is
selected.
8.2.1.2.2
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.
The RMS current through the inductor is approximated by the equation:
(9)
Copyright © 2011–2016, Texas Instruments Incorporated
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