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ADP2302ARDZ-R7 数据表(PDF) 18 Page - Analog Devices

部件名 ADP2302ARDZ-R7
功能描述  2 A/3 A, 20 V, 700 kHz, Nonsynchronous Step-Down Regulators
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP2302ARDZ-R7 数据表(HTML) 18 Page - Analog Devices

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ADP2302/ADP2303
Rev. 0 | Page 18 of 28
CATCH DIODE
response and efficiency. Therefore, the inductor value is calculated
using the following equation:
The catch diode conducts the inductor current during the off
time of the internal MOSFET. The average current of the diode
in normal operation is, therefore, dependent on the duty cycle
of the regulator as well as the output load current.
()
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
×
×
×
−
=
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.
(max)
)
(
1
LOAD
D
IN
D
OUT
AVG
DIODE
I
V
V
V
V
I
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
−
=
The inductor peak current is calculated using the following
equation:
where VD is the diode forward drop.
2
(max)
RIPPLE
LOAD
PEAK
I
I
I
Δ
+
=
The only reason to select a diode with a higher current rating
than necessary in normal operation is for the worst-case condi-
tion, in which there is a shorted output. In this case, the diode
current increases up to the typical peak current limit threshold.
Be sure to consult the diode data sheet to ensure that the diode
can operate well within the thermal and electrical limits.
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.
The reverse breakdown voltage rating of the diode must be higher
than the highest input voltage and allow an appropriate margin
for the ringing that may be present on the SW node. A Schottky
diode is recommended for the best efficiency because it has a
low forward voltage drop and fast switching speed. Table 7
provides a list of recommended Schottky diodes.
Inductor conduction loss is caused by the flow of current
through internal dc resistance (DCR). Larger sized inductors
have smaller DCR of the inductor and, therefore, may reduce
inductor conduction losses. Inductor core loss is related to the
core material and the ac flux swing, which are affected by the
peak-to-peak inductor ripple current. Because the ADP2302/
ADP2303 are high frequency switching regulators, shielded fer-
rite core materials are recommended for their low core losses
and low EMI. Some recommended inductors are shown in
Table 8.
Table 7. Recommended Schottky Diodes
Vendor
Part No.
VRRM (V)
IAVG (A)
Vishay
SSB43L
30
4
SSA33L
30
3
ON Semiconductor
MBRS330T3
30
3
Diodes Inc.
B330B
30
3
Table 8. Recommended Inductors
Vendor
Value (μH)
Part No.
DCR (mΩ)
ISAT (A)
Dimensions L × W × H (mm)
2.5
CDRH104RNP-2R5N
7.8
7.5
10.5 × 10.3 × 3.8
3.8
CDRH104RNP-3R8N
9.6
6
10.5 × 10.3 × 3.8
5.2
CDRH104RNP-5R2N
16
5.5
10.5 × 10.3 × 3.8
7
CDRH104RNP-7R0N
20
4.8
10.5 × 10.3 × 3.8
Sumida
10
CDRH104RNP-100N
26
4.4
10.5 × 10.3 × 3.8
2.5
MSS1038-252NL
10
7.62
10 × 10.2 × 3.8
3.8
MSS1038-382NL
13
6.5
10 × 10.2 × 3.8
5.2
MSS1038-522NL
22
5.28
10 × 10.2 × 3.8
7
MSS1038-702NL
27
4.74
10 × 10.2 × 3.8
Coilcraft
10
MSS1038103NL
35
3.9
10 × 10.2 × 3.8
2.8
#919AS-2R8M
10.7
8.3
10.3 × 10.3 × 4.5
3.7
#919AS-3R7M
14.2
7
10.3 × 10.3 × 4.5
4.7
#919AS-4R7M
16.2
6.1
10.3 × 10.3 × 4.5
6.4
#919AS-6R4M
22.9
5.2
10.3 × 10.3 × 4.5
Toko
10
#919AS-100M
26.5
4.3
10.3 × 10.3 × 4.5
2.2
VLF10040T-2R2N7R1
7.9
8.2
10 × 9.7 × 4.0
3.3
VLF10040T-3R3N6R2
10.5
6.7
10 × 9.7 × 4.0
4.7
VLF10040T-4R7N5R4
12.7
5.4
10 × 9.7 × 4.0
6.8
VLF10040T-6R8N4R5
19.8
4.6
10 × 9.7 × 4.0
TDK
10
VLF10040T-100M3R8
28
3.8
10 × 9.7 × 4.0



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