參數資料
型號： LM2671-ADJMWC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
封裝： WAFER
文件頁數： 9/30頁
文件大?。?/td> 612K
代理商： LM2671-ADJMWC
LM2671 Series Buck Regulator Design Procedure (Fixed Output) (Continued)
LM2671 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
To simplify the buck regulator design procedure, National
Semiconductor is making available computer design software to
be used with the SIMPLE SWITCHER line of switching
regulators. LM267X Made Simple is available on (version 6.0)
Windows
3.1, NT, or 95 operating systems.
Given:
V
OUT = Regulated Output Voltage
V
OUT = 20V
V
IN(max) = Maximum Input Voltage
V
IN(max) = 28V
I
LOAD(max) = Maximum Load Current
I
LOAD(max) = 500 mA
F = Switching Frequency
(Fixed at a nominal 260 kHz).
F = Switching Frequency
(Fixed at a nominal 260 kHz).
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Use the following formula to select the appropriate resistor
values.
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Select R
1 to be 1 k, 1%. Solve for R2.
where V
REF = 1.21V
Select a value for R
1 between 240 and 1.5 k. The lower
resistor values minimize noise pickup in the sensitive feedback
pin. (For the lowest temperature coefficient and the best stability
with time, use 1% metal film resistors.)
R
2 =1 k (16.53 1) = 15.53 k, closest 1% value is 15.4 k.
R
2 = 15.4 k.
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant E T
(V
s), from the following formula:
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant (E T),
where V
SAT=internal switch saturation voltage=0.25V and
V
D = diode forward voltage drop = 0.5V
AVX TPS
Recommended
Application Voltage
Voltage
Rating
+85C Rating
3.3
6.3
510
10
20
12
25
15
35
Sprague 594D
Recommended
Application Voltage
Voltage
Rating
+85C Rating
2.5
4
3.3
6.3
510
816
12
20
18
25
24
35
29
50
FIGURE 15. Recommended Application Voltage for AVX TPS and
Sprague 594D Tantalum Chip Capacitors Derated for 85C.
LM2671
www.national.com
17
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相關代理商/技術參數
參數描述
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