參數(shù)資料
型號(hào)： LM2577S-12
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Pressure Transducer, Series 19 mm, Uncompensated, Pressure Range: 0 psi to 100 psi, Absolute, flush mount, 10 Vdc excitation
中文描述： 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
封裝： TO-263, 5 PIN
文件頁(yè)數(shù)： 14/27頁(yè)
文件大?。?/td> 889K
代理商： LM2577S-12
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
相關(guān)PDF資料
PDF描述
LM2577N-ADJ Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 200 psi, Absolute, flush mount with flange, 10 Vdc excitation
LM2577N-15 Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 200 psi, Absolute, flush mount, 10 Vdc excitation
LM2577N-12 SIMPLE SWITCHER Step-Up Voltage Regulator
LM2577M-ADJ Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Gage, 1/4 BSPP, 10 Vdc excitation
LM2577T-ADJ SIMPLE SWITCHER Step-Up Voltage Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2577S-12/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(fēng)格:SMD/SMT
LM2577S-12/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
LM2577S-15 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM2577S-15/NOPB 功能描述:IC REG MULTI CONFIG 15V TO263-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR
LM2577S-15/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
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