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ADP2301AUJZ-R7 数据表(PDF) 18 Page - Analog Devices

部件名 ADP2301AUJZ-R7
功能描述  1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP2301AUJZ-R7 数据表(HTML) 18 Page - Analog Devices

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ADP2300/ADP2301
Data Sheet
Rev. C | Page 18 of 28
INDUCTOR
The high switching frequency of the ADP2300/ADP2301 allows
the use of small inductors. For best performance, use inductor
values between 2 μH and 10 μH for ADP2301, and use inductor
values between 2 μH and 22 μH for ADP2300.
The peak-to-peak inductor current ripple is calculated using the
following equation:


+
+
×
×
−
=
∆
D
IN
D
OUT
sw
OUT
IN
RIPPLE
V
V
V
V
f
L
V
V
I
)
(
where:
fSW is the switching frequency.
L is the inductor value.
VD is the diode forward drop.
VIN is the input voltage.
VOUT is the output voltage.
Inductors of smaller values are usually smaller in size and less
expensive, but increase the ripple current and the output voltage
ripple. As a guideline, the inductor peak-to-peak current ripple
should typically be set to 30% of the maximum load current for
optimal transient response and efficiency. Therefore, the inductor
value is calculated using the following equation:
(
)


+
+
×
×
×
−
=
D
IN
D
OUT
sw
LOAD
OUT
IN
V
V
V
V
f
I
V
V
L
(max)
3
.
0
where ILOAD(max) is the maximum load current.
The inductor peak current is calculated using the following
equation:
2
(max)
RIPPLE
LOAD
PEAK
I
I
I
∆
+
=
The minimum current rating of the inductor must be greater
than the inductor peak current. For ferrite core inductors with a
quick saturation characteristic, the inductor saturation current
rating should be higher than the switch current-limit threshold
to prevent the inductor from reaching its saturation point. Be
sure to validate the worst-case condition, in which there is a
shorted output, over the intended temperature range.
Inductor conduction losses are caused by the flow of current
through the inductor, which is associated with the internal dc
resistance (DCR). Larger sized inductors have smaller DCR and,
therefore, may reduce inductor conduction losses. However,
inductor core losses are also related to the core material and the
ac flux swing, which are affected by the peak-to-peak induc-
tor ripple current. Because the ADP2300/ADP2301 are high
switching frequency regulators, shielded ferrite core materials
are recommended for their low core losses and low EMI. Some
recommended inductors are shown in Table 7.
Table 7. Recommended Inductors
Vendor
Value (µH)
Part No.
DCR (mΩ)
I
SAT (A)
Dimensions
L × W × H (mm)
Coilcraft
4.7
LPS6225-472MLC
65
3.1
6.0 × 6.0 × 2.4
6.8
LPS6225-682MLC
95
2.7
6.0 × 6.0 × 2.4
10
LPS6225-103MLC
105
2.1
6.0 × 6.0 × 2.4
Sumida
4.7
CDRH5D28RHPNP-4R7N
43
3.7
6.2 × 6.2 × 3.0
4.7
CDRH5D16NP-4R7N
64
2.15
5.8 × 5.8 × 1.8
6.8
CDRH5D28RHPNP-6R8N
61
3.1
6.2 × 6.2 × 3.0
6.8
CDRH5D16NP-6R8N
84
1.8
5.8 × 5.8 × 1.8
10
CDRH5D28RHPNP-100M
93
2.45
6.2 × 6.2 × 3.0
Cooper Bussmann
4.7
SD53-4R7-R
39
2.1
5.2 × 5.2 × 3.0
6.8
SD53-6R8-R
59
1.85
5.2 × 5.2 × 3.0
10
DR73-100-R
65
2.47
7.6 × 7.6 × 3.5
Toko
4.7
B1077AS-4R7N
34
2.6
7.6 × 7.6 × 4.0
6.8
B1077AS-6R8N
40
2.3
7.6 × 7.6 × 4.0
10
B1077AS-100M
58
1.8
7.6 × 7.6 × 4.0
TDK
4.7
VLC5045T-4R7M
34
3.3
5.0 × 5.0 × 4.5
6.8
VLC5045T-6R8M
46
2.7
5.0 × 5.0 × 4.5
10
VLC5045T-100M
66
2.1
5.0 × 5.0 × 4.5



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