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| 型號： | LM2672MX-5.0 |
| 文件頁數(shù)： | 11/25頁 |
| 文件大小： | 495K |
| 代理商： | LM2672MX-5.0 |
LM2671 Series Buck Regulator Design Procedure (Fixed Output)
(Continued)
PROCEDURE (Fixed Output Voltage Version)
The capacitor list contains through-hole electrolytic capacitors
from four different capacitor manufacturers and surface mount
tantalum capacitors from two different capacitor manufacturers.
It is recommended that both the manufacturers and the
manufacturer’s series that are listed in the table be used. A
table listing the manufacturers’ phone numbers is located in
Figure 11
EXAMPLE (Fixed Output Voltage Version)
Surface Mount:
68 μF/10V
Sprague 594D Series.
100 μF/10V
AVX TPS Series.
Through Hole:
68 μF/10V
Sanyo OS-CON SA Series.
150 μF/35V
Sanyo MV-GX Series.
150 μF/35V
Nichicon PL Series.
150 μF/35V
Panasonic HFQ Series.
3. Catch Diode Selection (D1)
A.
Refer to the table shown in Figure 12 In this example, a 1A,
20V Schottky diode will provide the best performance. If the
circuit must withstand a continuous shorted output, a higher
current Schottky diode is recommended.
3. Catch Diode Selection (D1)
A.
In normal operation, the average current of the catch diode is
the load current times the catch diode duty cycle, 1-D (D is the
switch duty cycle, which is approximately the output voltage
divided by the input voltage). The largest value of the catch
diode average current occurs at the maximum load current and
maximum input voltage (minimum D). For normal operation, the
catch diode current rating must be at least 1.3 times greater
than its maximum average current. However, if the power supply
design must withstand a continuous output short, the diode
should have a current rating equal to the maximum current limit
of the LM2671. The most stressful condition for this diode is a
shorted output condition.
B.
The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
C.
Because of their fast switching speed and low forward
voltage drop, Schottky diodes provide the best performance and
efficiency. This Schottky diode must be located close to the
LM2671 using short leads and short printed circuit traces.
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2672MXADJ | 制造商:Texas Instruments 功能描述: |
| LM2672MX-ADJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2672MX-ADJ/E7000820 | 制造商:Texas Instruments 功能描述: |
| LM2672MX-ADJ/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 HIGH EFF 1A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2672MX-ADJEP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features |
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