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參數(shù)資料
| 型號： | LM2577SX-15/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | TO-263, 5 PIN |
| 文件頁數(shù)： | 6/34頁 |
| 文件大小： | 1008K |
| 代理商： | LM2577SX-15/NOPB |
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Application Hints (Continued)
From
Figure 7 (for 12V output) or Figure 8 (for 15V
output), identify inductor code for region indicated by
V
IN (min) and ILOAD (max). The shaded region indicates
conditions for which the LM1577/LM2577 output switch
would be operating beyond its switch current rating. The
minimum operating voltage for the LM1577/LM2577 is
3.5V.
From here,
proceed to step C.
2. For Adjustable version
Preliminary calculations:
The inductor selection is based on the calculation of the
following three parameters:
D
(max), the maximum switch duty cycle (0 ≤ D ≤ 0.9):
where V
F = 0.5V for Schottky diodes and 0.8V for fast recov-
ery diodes (typically);
E
T, the product of volts x time that charges the inductor:
IIND,DC, the average inductor current under full load;
B.
Identify Inductor Value:
1. From
Figure 9, identify the inductor code for the re-
gion indicated by the intersection of E
T and I
IND,DC.
This code gives the inductor value in microhenries. The
L or H prefix signifies whether the inductor is rated for a
maximum E
T of90Vs (L) or 250 Vs (H).
2. If D < 0.85, go on to step C. If D
≥ 0.85, then calcu-
late the minimum inductance needed to ensure the
switching regulator’s stability:
If L
MIN is smaller than the inductor value found in step B1, go
on to step C. Otherwise, the inductor value found in step B1
is too low; an appropriate inductor code should be obtained
from the graph as follows:
1. Find the lowest value inductor that is greater than L
MIN.
2. Find where E
T intersects this inductor value to determine
if it has an L or H prefix. If E
T intersects both the L and H re-
gions, select the inductor with an H prefix.
DS011468-27
FIGURE 7. LM2577-12 Inductor Selection Guide
DS011468-28
FIGURE 8. LM2577-15 Inductor Selection Guide
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 |
|---|---|
| LM2577SX-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 安裝風格:SMD/SMT |
| LM2577SX-ADJ/NOPB | 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 安裝風格:SMD/SMT |
| LM2577T-12 | 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 安裝風格:SMD/SMT |
| LM2577T12 | 制造商:Texas Instruments 功能描述:SWITCHING REG 3A 12V 2577 TO2205 |
| LM2577T-12/LB03 | 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 安裝風格:SMD/SMT |
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