参数资料
型号: LM2577M-12/NOPB
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 稳压器
英文描述: 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDSO24
封装: 0.300 INCH, SO-24
文件页数: 8/31页
文件大小: 1406K
代理商: LM2577M-12/NOPB
Application Hints (Continued)
ditions 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
recovery diodes (typically);
E
T, the product of volts x time that charges the inductor:
I
IND,DC, the average inductor current under full load;
B. Identify Inductor Value:
1. From Figure 9, identify the inductor code for the
region 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 calculate
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
regions, select the inductor with an H prefix.
01146827
FIGURE 7. LM2577-12 Inductor Selection Guide
01146828
FIGURE 8. LM2577-15 Inductor Selection Guide
LM1577/LM2577
www.national.com
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相关PDF资料
PDF描述
LM2577NADJ 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDIP24
LM2577S-15/NOPB 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
LM2577SADJ 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
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