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參數(shù)資料
| 型號(hào)： | LM3670 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | RECTIFIER STANDARD SINGLE 1A 100V 100 30A-ifsm 5uA-ir 1V-vf A405 5K/REEL-13 |
| 中文描述： | 微型降壓型DC - DC轉(zhuǎn)換器的超低電壓電路 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大小： | 997K |
| 代理商： | LM3670 |
Application Information
(Continued)
TABLE 1. Suggested Inductors and Their Suppliers
Model
Vendor
Vishay
Coilcraft
Panasonic
Sumida
Phone
FAX
IDC2512NB100M
DO1608C-103
ELL6RH100M
CDRH5D18-100
408-727-2500
847-639-6400
714-373-7366
847-956-0666
408-330-4098
847-639-1469
714-373-7323
847-956-0702
OUTPUT CAPACITOR SELECTION
The output filter capacitor smoothes out current flow from the
inductor to the load, helps maintain a steady output voltage
during transient load changes and reduces output voltage
ripple. These capacitors must be selected with sufficient
capacitance and sufficiently low ESR to perform these func-
tions.
The output ripple current can be calculated as:
Voltage peak-to-peak ripple due to capacitance =
Voltage peak-to-peak ripple due to ESR =
Voltage peak-to-peak ripple, root mean squared =
Note that the output ripple is dependent on the current ripple
and the equivalent series resistance of the output capacitor
(R
ESR
).
Because these two components are out of phase the rms
value is used. The R
ESR
is frequency dependent (as well as
temperature dependent); make sure the frequency of the
R
ESR
given is the same order of magnitude as the switching
frequency.
TABLE 2. Suggested Capacitors and Their Suppliers
Model
Type
Vendor
Phone
FAX
10 μF for C
OUT
VJ1812V106MXJAT
LMK432BJ106MM
JMK325BJ106MM
4.7 μF for C
IN
VJ1812V475MXJAT
EMK325BJ475MN
C3216X5R0J475M
Ceramic
Ceramic
Ceramic
Vishay
Taiyo-Yuden
Taiyo-Yuden
408-727-2500
847-925-0888
847-925-0888
408-330-4098
847-925-0899
847-925-0899
Ceramic
Ceramic
Ceramic
Vishay
Taiyo-Yuden
TDK
408-727-2500
847-925-0888
847-803-6100
408-330-4098
847-925-0899
847-803-6296
TABLE 3. Adjustable LM3670 Configurations for Various V
OUT
R2 (K
)
C1 (pF)
200
200
200
130
200
100
200
82
200
68
200
56
200
56
150
75
200
39
200
39
200
33
200
30
VOUT (V)
0.7
0.8
0.9
1.0
1.1
1.2
1.24
1.24
1.5
1.6
1.7
1.875
R1 (K
)
80.6
120
160
200
240
280
300
221
402
442
487
549
C2 (pF)
150
none
none
none
none
none
none
120
none
none
none
none
L (μH)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
10
10
10
10
CIN (μF)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
COUT (μF)
10
10
10
10
10
10
10
10
10
10
10
14.7
Note:
(10 || 4.7)
22
2.5
806
200
22
82
10
4.7
L
www.national.com
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LM3670B-0250 WAF | 制造商:Texas Instruments 功能描述: |
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| LM3670MF-1.2/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3670MF-1.2/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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