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参数资料
| 型号： | ADP2301-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADP2301 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 1.2A |
| 输入电压： | 3 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.4MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2301 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
I PEAK = I LOAD (max) +
ADP2300/ADP2301
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:
Data Sheet
The inductor peak current is calculated using the following
equation:
? I RIPPLE
2
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
× ? ?
?
?
? I RIPPLE =
( V IN ? V OUT ) ? V OUT + V D
L × f sw ? V IN + V D
?
?
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
where:
f SW is the switching frequency.
L is the inductor value.
V D is the diode forward drop.
V IN is the input voltage.
V OUT 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:
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
× ? ? OUT
?
?
L =
( V IN ? V OUT )
0 . 3 × I LOAD (max) × f sw
? V + V D
? V IN + V D
?
?
where I LOAD(max) is the maximum load current.
Table 7. Recommended Inductors
Vendor
Coilcraft
Sumida
Cooper Bussmann
Toko
TDK
Value (μH)
4.7
6.8
10
4.7
4.7
6.8
6.8
10
4.7
6.8
10
4.7
6.8
10
4.7
6.8
10
Part No.
LPS6225-472MLC
LPS6225-682MLC
LPS6225-103MLC
CDRH5D28RHPNP-4R7N
CDRH5D16NP-4R7N
CDRH5D28RHPNP-6R8N
CDRH5D16NP-6R8N
CDRH5D28RHPNP-100M
SD53-4R7-R
SD53-6R8-R
DR73-100-R
B1077AS-4R7N
B1077AS-6R8N
B1077AS-100M
VLC5045T-4R7M
VLC5045T-6R8M
VLC5045T-100M
DCR (mΩ)
65
95
105
43
64
61
84
93
39
59
65
34
40
58
34
46
66
I SAT (A)
3.1
2.7
2.1
3.7
2.15
3.1
1.8
2.45
2.1
1.85
2.47
2.6
2.3
1.8
3.3
2.7
2.1
Dimensions
L × W × H (mm)
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.2 × 6.2 × 3.0
5.8 × 5.8 × 1.8
6.2 × 6.2 × 3.0
5.8 × 5.8 × 1.8
6.2 × 6.2 × 3.0
5.2 × 5.2 × 3.0
5.2 × 5.2 × 3.0
7.6 × 7.6 × 3.5
7.6 × 7.6 × 4.0
7.6 × 7.6 × 4.0
7.6 × 7.6 × 4.0
5.0 × 5.0 × 4.5
5.0 × 5.0 × 4.5
5.0 × 5.0 × 4.5
Rev. C | Page 18 of 28
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