參數(shù)資料
型號(hào)： LM2596
廠商： National Semiconductor, Corp.
元件分類： 穩(wěn)壓器
英文描述： SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator
中文描述： SIMPLE SWITCHER系列電源轉(zhuǎn)換器,150KHz，3A降壓穩(wěn)壓器
文件頁(yè)數(shù)： 13/31頁(yè)
文件大?。?/td> 736K
代理商： LM2596
LM2596 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
Given:
V
OUT
= Regulated Output Voltage
V
IN
(max) = Maximum Input Voltage
I
LOAD
(max) = Maximum Load Current
F = Switching Frequency (Fixed at a nominal 150 kHz).
Given:
V
OUT
= 20V
V
IN
(max) = 28V
I
LOAD
(max) = 3A
F = Switching Frequency (Fixed at a nominal 150 kHz).
1. Programming Output Voltage
(Selecting R
1
and R
2
, as
shown in Figure 1 )
Use the following formula to select the appropriate resistor
values.
Select a value for R
1
between 240
and 1.5 k
. The lower
resistor values minimize noise pickup in the sensitive feed-
back pin. (For the lowest temperature coefficient and the best
stability with time, use 1% metal film resistors.)
1. Programming Output Voltage
(Selecting R
1
and R
2
, as
shown in Figure 1 )
Select R
1
to be 1 k
, 1%. Solve for R
2
.
R
2
= 1k (16.26 1) = 15.26k, 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
μs), from the following formula:
where V
SAT
= internal switch saturation voltage = 1.16V
and V
D
= diode forward voltage drop = 0.5V
B.
Use the E
T value from the previous formula and match it
with the E
T number on the vertical axis of the Inductor Value
Selection Guide shown in Figure 7
C.
on the horizontal axis, select the maximum load current.
D.
Identify the inductance region intersected by the E
T value
and the Maximum Load Current value. Each region is identi-
fied by an inductance value and an inductor code (LXX).
E.
Select an appropriate inductor from the four manufacturer’s
part numbers listed in Figure 8
2. Inductor Selection (L1)
A.
Calculate the inductor Volt
microsecond constant
(E
T),
B.
E
T = 34.2 (V
μs)
C.
I
LOAD
(max) = 3A
D.
From the inductor value selection guide shown in Figure 7
the inductance region intersected by the 34 (V
μs) horizontal
line and the 3A vertical line is 47 μH, and the inductor code is
L39.
E.
From the table in Figure 8 locate line L39, and select an
inductor part number from the list of manufacturers part num-
bers.
L
www.national.com
13
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LM2596DSADJR4G 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A BUCK SWCH 150KHZ RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
LM2596S 制造商:Texas Instruments 功能描述:
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