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LTC3621 bảng dữ liệu(PDF) 14 Page - Analog Devices

tên linh kiện LTC3621
Giải thích chi tiết về linh kiện  17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current
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LTC3621 bảng dữ liệu(HTML) 14 Page - Analog Devices

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LTC3621/LTC3621-2
14
Rev. D
For more information www.analog.com
APPLICATIONS INFORMATION
Efficiency Considerations
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Percent efficiency can
be expressed as:
% Efficiency = 100% – (Loss1 + Loss2 + …)
where Loss1, Loss2, etc. are the individual losses as a
percentageofinputpower.Althoughalldissipativeelements
in the circuit produce losses, three main sources usually
account for most of the losses in LTC3621 circuits: 1) I2R
losses, 2) switching and biasing losses, 3) other losses.
1. I2R losses are calculated from the DC resistances of
the internal switches, RSW, and external inductor, RL.
In continuous mode, the average output current flows
through inductor L but is “chopped” between the
internal top and bottom power MOSFETs. Thus, the
series resistance looking into the SW pin is a function
of both top and bottom MOSFET RDS(ON) and the duty
cycle (DC) as follows:
RSW = (RDS(ON)TOP)(DC) + (RDS(ON)BOT)(1 – DC)
TheRDS(ON)forboththetopandbottomMOSFETscanbe
obtained from the Typical Performance Characteristics
curves. Thus to obtain I2R losses:
I2R losses = IOUT2(RSW + RL)
Table 1. Inductor Selection Table
INDUCTOR
INDUCTANCE
(µH)
DCR
(mΩ)
MAX CURRENT
(A)
DIMENSIONS
(mm)
HEIGHT
(mm)
MANUFACTURER
IHLP-1616BZ-11 Series
1.0
2.2
4.7
24
61
95
4.5
3.25
1.7
4.3 × 4.7
4.3 × 4.7
4.3 × 4.7
2
2
2
Vishay
www.vishay.com
IHLP-2020BZ-01 Series
1
2.2
3.3
4.7
5.6
6.8
18.9
45.6
79.2
108
113
139
7
4.2
3.3
2.8
2.5
2.4
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
2
2
2
2
2
2
FDV0620 Series
1
2.2
3.3
4.7
18
37
51
68
5.7
4
3.2
2.8
6.7 × 7.4
6.7 × 7.4
6.7 × 7.4
6.7 × 7.4
2
2
2
2
Toko
www.toko.com
MPLC0525L Series
1
1.5
2.2
16
24
40
6.4
5.2
4.1
6.2 × 5.4
6.2 × 5.4
6.2 × 5.4
2.5
2.5
2.5
NEC/Tokin
www.nec-tokin.com
XFL4020 Series
1.0
1.5
2.2
3.3
4.7
10.8
14.4
21.3
34.8
52.2
5.1
4.4
3.5
2.5
2.5
4 × 4
4 × 4
4 × 4
4 × 4
4 × 4
2.1
2.1
2.1
2.1
2.1
Coilcraft
www.coilcraft.com
RLF7030 Series
1
1.5
2.2
3.3
4.7
6.8
8.8
9.6
12
20
31
45
6.4
6.1
5.4
4.1
3.4
2.8
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
3.2
3.2
3.2
3.2
3.2
3.2
TDK
www.tdk.com
WE-TPC 4828 Series
1.2
1.8
2.2
2.7
3.3
3.9
4.7
17
20
23
27
30
47
52
3.1
2.7
2.5
2.35
2.15
1.72
1.55
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
2.8
2.8
2.8
2.8
2.8
2.8
2.8
Würth Elektronik
www.we-online.com



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