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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 1037K |
| 代理商： | LM1578 |
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Typical Applications
(Continued)
The circuit of Figure 19converts a 5V supply into a 15V sup-
ply with 150 mA of output current, a load regulation of 14 mV
(30 mA to 140 mA), and a line regulation of 35 mV (4.5V
≤
V
in
≤
8.5V).
R1 = (V
o
1) R2 where R2 = 10 k
.
R3 = V/(I
L(max, DC)
+ 0.5
I
L
)
where:
I
L
= 2(I
LOAD(min)
)(V
o
/V
in
)
I
L
is 200 mA in this example.
R4, C3 and C4 are necessary for continuous operation and
are typically 220 k
, 20 pF, and 0.0022 μF respectively.
C1 is the timing capacitor found in Figure 1
C2
≥
I
o
(V
o
V
in
)/(f
osc
V
o
V
ripple
).
D1 is a Schottky type diode such as a IN5818 or IN5819.
L1 is found as described in the buck converter section, using
the inductance chart for Figure 16for the boost configuration
and 20% discontinuity.
INVERTING REGULATOR
Figure 20 shows the basic configuration for an inverting
regulator. The input voltage is of a positive polarity, but the
output is negative. The output may be less than, equal to, or
greater in magnitude than the input. The relationship be-
tween the magnitude of the input voltage and the output volt-
age is V
o
= V
in
x (t
on
/t
off
).
Figure 21 shows an LM1578A configured as a 5V to 15V
polarity inverter with an output current of 300 mA, a load
regulation of 44 mV (60 mA to 300 mA) and a line regulation
of 50 mV (4.5V
≤
V
in
≤
8.5V).
R1 = (|V
o
| +1) R2 where R2 = 10 k
.
R3 = V/(I
L(max, DC)
+ 0.5
I
L
).
R4 = 10V
BE1
B
f
/(I
L (max, DC)
+ 0.5
I
L
)
where:
V, V
, V
, and B
are defined in the “Buck Converter with
Boosted Output Current” section.
I
L
= 2(I
LOAD(min)
)(V
in
+|V
o
|)/V
IN
R5 is defined in the “Buck with Boosted Output Current” sec-
tion.
R6 serves the same purpose as R4 in the Boost Regulator
circuit and is typically 220 k
.
C1, C3 and C4 are defined in the “Boost Regulator” section.
C2
≥
I
o
|V
o
|/[f
osc
(|V
o
| + V
in
) V
ripple
]
L1 is found as outlined in the section on buck converters, us-
ing the inductance chart of Figure 16for the invert configura-
tion and 20% discontinuity.
DS008711-9
FIGURE 18. Basic Boost Regulator
DS008711-11
V
in
= 5V
V
o
= 15V
V
ripple
= 10 mV
I
o
= 140 mA
f
osc
= 50 kHz
R1 = 140 k
R2 = 10 k
R3 = 0.15
R4 = 200 k
C1 = 1820 pF
C2 = 470 μF
C3 = 20 pF
C4 = 0.0022 μF
L1 = 330 μH
D1 = 1N5818
FIGURE 19. Boost or Step-Up Regulator
DS008711-10
FIGURE 20. Basic Inverting Regulator
13
www.national.com
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PDF描述 |
|---|---|
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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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