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參數(shù)資料
| 型號： | LM1578 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 1037K |
| 代理商： | LM1578 |
Typical Applications
(Continued)
Capacitor C1 sets the oscillator frequency and is selected
from Figure 1
Capacitor C2 serves as a compensation capacitor for syn-
chronous operation and a value of 10 to 50 pF should be suf-
ficient for most applications.
A minimum value for an ideal output capacitor C3, could be
calculated as C = I
x t/
V where I
is the load current, t is
the transistor on time (typically 0.4/f
), and
V is the
peak-to-peak output voltage ripple. A larger output capacitor
than this theoretical value should be used since electrolytics
have poor high frequency performance. Experience has
shown that a value from 5 to 10 times the calculated value
should be used.
For good efficiency, the diodes must have a low forward volt-
age drop and be fast switching. 1N5819 Schottky diodes
work well.
Transformer selection should be picked for an output transis-
tor “on” time of 0.4/f
, and a primary inductance high
enough to prevent the output transistor switch from ramping
higher than the transistor’s rating of 750 mA. Pulse Engi-
neering (San Diego, Calif.) and Renco Electronics, Inc.
(Deer Park, N.Y.) can provide further assistance in selecting
the proper transformer for a specific application need. The
transformer used in Figure 23 was a Pulse Engineering
PE-64287.
DS008711-13
9V
≤
V
in
≤
15V
V
o
= 12V
I
o
= 100 mA
V
ripple
= 50 mV
f
osc
= 50 kHz
R1 = 110k
R2 = 10k
R3 = 0.15
R4 = 220k
R5 = 270
C1 = 1820 pF
C2 = 220 μF
C3 = 20 pF
C4 = 0.0022 μF
L1 = 220 μH
D1, D2 = 1N5819
Q1 = D44
FIGURE 22. Buck-Boost Regulator
DS008711-14
V
in
= 5V
V
o
±
12V
I
o
=
±
40 mA
f
osc
= 80 kHz
R1 = 10 k
R2 = 240 k
R3 = 240 k
R4 = 0.15
C1 = 820 pF
C2 = 10 pF
C3 = 220 μF
D1, D2, D3 = 1N5819
T1 = PE-64287
FIGURE 23. RS-232 Line Driver Power Supply
15
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1578A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Switching Regulator |
| LM1578AH/883 | 制造商:Rochester Electronics LLC 功能描述: |
| LM1578H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
| LM158 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low power dual operational amplifiers |
| LM158 MD8 | 制造商:Texas Instruments 功能描述:LINEAR IC-NON VMI |
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