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参数资料
| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 4/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
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IN
S
V
D =
V
h
Duty Cycle:
1.
IN_min
L
V
D
I =
f L
Inductor ripple current:
2.
-
-
÷
è
L
OUT_max
LIM_min
I
=
I
(1
D)
2
Maximum output current:
3.
-
OUT
L
swpeak
I
=
+
2
1 D
Peak switch current:
4.
SLVS904A – MAY 2009 – REVISED JANUARY 2011
www.ti.com
BOOST CONVERTER DESIGN PROCEDURE
The first step in the design procedure is to verify whether the maximum possible output current of the boost
converter supports the specific application requirements. A simple approach is to estimate the converter
efficiency, by taking the efficiency numbers from the provided efficiency curves or to use a worst case
assumption for the expected efficiency, e.g. 85%.
(1)
(2)
(3)
(4)
Iswpeak = Converter switch current (must be < ILIM_min = 4 A)
f = Converter switching frequency (typically 1.2 MHz or 630 kHz)
L = Selected inductor value (from the Inductor Selection section)
h = Estimated converter efficiency (use the number from the efficiency plots or 85% as an estimation)
ΔIL = Inductor peak-to-peak ripple current
The peak switch current is the steady state current that the integrated switch, inductor and external Schottky
diode have to be able to handle. The calculation must be done for the minimum input voltage where the peak
switch current is highest.
Inductor Selection
The main parameter for the inductor selection is the saturation current of the inductor which should be higher
than the peak switch current as calculated above with additional margin to cover for heavy load transients. An
alternative, more conservative, is to choose the inductor with a saturation current at least as high as the
maximum switch current limit of 5.6 A. Another important parameter is the inductor DC resistance. Usually the
lower the DC resistance the higher the efficiency. It is important to note that the inductor DC resistance is not the
only parameter determining the efficiency. Especially for a boost converter where the inductor is the energy
storage element, the type and core material of the inductor influences the efficiency as well. At high switching
frequencies of 1.2 MHz inductor core losses, proximity effects and skin effects become more important. Usually
an inductor with a larger form factor gives higher efficiency. The efficiency difference between different inductors
can vary between 2% to 10%. For the TPS65148, inductor values between 3.3 mH and 6.8 mH are a good choice
with a switching frequency of 1.2 MHz. At 630 kHz, inductors between 7 mH and 13 mH are recommended.
Table 1. Inductor Selection
L
COMPONENT SUPPLIER
COMPONENT CODE
SIZE
DCR TYP
Isat
(mH)
(LxWxH mm)
(m
)
(A)
1.2 MHz
6.8
Epcos
B82464G4682M
10.4 x 10.4 x 4.9
20
4.3
4.7
Coiltronics
UP2B-4R7-R
14 x 10.4 x 6
16.5
4.2
4.7
Sumida
CDRH124NP-4R7M
12.3 x 12.3 x 4.5
18
5.7
4.7
Sumida
CDRH127NP-4R7N
12.3 × 12.3 × 8
11.7
6.8
630 kHz
10
Coilcraft
DS3316P-103ML
12.95 × 9.4 × 5.08
80
3.5
10
Sumida
CDRH8D43NP-100N
8.3 × 8.3 × 4.5
29
4.0
10
Sumida
CDRH127NP-100N
12.3 × 12.3 × 8
16
5.4
10
Sumida
CDRH127/LDNP-100M
12.3 × 12.3 × 8
15
6.7
12
Copyright 2009–2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS65148
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