參數(shù)資料
型號(hào)： LM1577K-15
廠商： National Semiconductor Corporation
英文描述： SIMPLE SWITCHER-R Step-Up Voltage Regulator
中文描述： SIMPLE SWITCHER系列- R的升壓穩(wěn)壓器
文件頁(yè)數(shù)： 14/27頁(yè)
文件大小： 870K
代理商： LM1577K-15
Application Hints
(Continued)
From
Figure 7
(for 12V output) or
Figure 8
(for 15V
output), identify inductor code
for region indicated by
V
and I
. 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
=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:
I
IND,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
.
This code gives the inductor value in microhenries. The
L or H prefix signifies whether the inductor is rated for a
maximum E
T of 90 V
μs (L) or 250 V
μs (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
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
LM1577K-15/883 制造商:Rochester Electronics LLC 功能描述:- Bulk
LM1577K883 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator
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LM1577KADJ 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM1577K-ADJ/883 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Up 3.5V to 40V 5-Pin(4+Tab) TO-3 Tray
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