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參數資料
| 型號： | ADP3170 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Charger front end protection IC with 30V max Vin and 4.5V LDO output 8-WSON 0 to 125 |
| 中文描述： | VRM電源單相兼容8.5核心控制器 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 183K |
| 代理商： | ADP3170 |
REV. 0
ADP3170
–9–
Designing an Inductor
Once the inductance is known, the next step is either to design
an inductor or find a standard inductor that comes as close as
possible to meeting the overall design goals. The first decision
in designing the inductor is to choose the core material. There
are several possibilities for providing low core loss at high fre-
quencies. Two examples are the powder cores (e.g., Kool-M
from Magnetics, Inc.) and the gapped soft ferrite cores (e.g.,
3F3 or 3F4 from Philips). Low frequency powdered iron cores
should be avoided due to their high core loss, especially when
the inductor value is relatively low and the ripple current is high.
Two main core types can be used in this application. Open
magnetic loop types, such as beads, beads on leads, and rods
and slugs, provide lower cost but do not have a focused mag-
netic field in the core. The radiated EMI from the distributed
magnetic field may create problems with noise interference in
the circuitry surrounding the inductor. Closed-loop types,
such as pot cores, PQ, U, and E cores, or toroids, cost more, but
have much better EMI/RFI performance. A good compromise
between price and performance are cores with a toroidal shape.
There are many useful references for quickly designing a power
inductor. Table II gives some examples.
T able II. Magnetics Design References
Magnetic Designer Software
Intusoft (http://www.intusoft.com)
Designing Magnetic Components for High-Frequency DC-DC
Converters
McLyman, Kg Magnetics
ISBN 1-883107-00-08
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16
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13
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11
1
2
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4
5
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7
8
9
10
FB
SD
REF
PWRGD
CT
COMP
PGND
DRVH
DRVL
LRDRV
LRFB
VCC
VID3
GND
VID2
VID1
VID0
VID25
CS+
CS
–
U1
ADP3170
FROM
CPU
C19
150pF
C
OC
2.7nF
R
30.1k
1%
R
13.7k
1%
C11
1nF
R4
220
R5
220
C8
100pF
C1
1000 F
C2
1000 F
C3
1000 F
C4
1000 F
C5
1000 F
L1
1.7 H
C7
100nF
C6
L1
1 H
Q1
FDB7045L
C12
22 F
Q2
FDB7045L
C13 C14 C15 C16 C17 C18 C19 C20
D1
MBR052LT1
D2
MBR052LT1
5V
12V
5V SB
VTT PWRGD CLK
R1
1k
V
CC(CORE)
1.05V
–
1.825V
23A
V
CC(CORE)
RTN
C23
220 F
1.8V SB
1.8V, 200mA
CORE
PWRGD
TO CPU
1000 F
8
RUBYCON ZA SERIES
24m ESR (EACH)
5V SB
Q6
IRL3103
R6
2.5m
C21
1 F
C22
68pF
R7
10k
Figure 3. 24 A VRM 8.5-Compliant CPU Supply
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