参数资料
型号: LM2577MX-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: 6/34页
文件大小: 1008K
代理商: LM2577MX-12/NOPB
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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相关代理商/技术参数
参数描述
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LM2577MX-ADJ 功能描述:IC REG MULTI CONFIG ADJ 24SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SIMPLE SWITCHER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR
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