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參數(shù)資料
| 型號： | LM2575 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator(1.0A,可調(diào)輸出電壓,降壓型開關(guān)穩(wěn)壓器) |
| 中文描述： | 1.0甲，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器（1.0安培，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 363K |
| 代理商： | LM2575 |
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LM2575
http://onsemi.com
9
Procedure
(Fixed Output Voltage Version)
In order to simplify the switching regulator design, a stepbystep design
procedure and example is provided.
Procedure
Example
Given Parameters:
V
out
= Regulated Output Voltage (3.3 V, 5.0 V, 12 V or 15 V)
V
in(max)
= Maximum DC Input Voltage
I
Load(max)
= Maximum Load Current
Given Parameters:
V
out
= 5.0 V
V
in(max)
= 20 V
I
Load(max)
= 0.8 A
1. Controller IC Selection
According to the required input voltage, output voltage and
current, select the appropriate type of the controller IC output
voltage version.
1. Controller IC Selection
According to the required input voltage, output voltage,
current polarity and current value, use the LM25755
controller IC
2. Input Capacitor Selection (C
in
)
To prevent large voltage transients from appearing at the input
and for stable operation of the converter, an aluminium or
tantalum electrolytic bypass capacitor is needed between the
input pin +V
in
and ground pin GND. This capacitor should be
located close to the IC using short leads. This capacitor should
have a low ESR (Equivalent Series Resistance) value.
2. Input Capacitor Selection (C
in
)
A 47 F, 25 V aluminium electrolytic capacitor located near
to the input and ground pins provides sufficient bypassing.
3. Catch Diode Selection (D1)
A.
Since the diode maximum peak current exceeds the
regulator maximum load current the catch diode current
rating must be at least 1.2 times greater than the maximum
load current. For a robust design the diode should have a
current rating equal to the maximum current limit of the
LM2575 to be able to withstand a continuous output short
B.
The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
3. Catch Diode Selection (D1)
A.
For this example the current rating of the diode is 1.0 A.
B.
Use a 30 V 1N5818 Schottky diode, or any of the
suggested fast recovery diodes shown in the Table 4.
4. Inductor Selection (L1)
A.
According to the required working conditions, select the
correct inductor value using the selection guide from
Figures 17 to 21
.
B.
From the appropriate inductor selection guide, identify the
inductance region intersected by the Maximum Input
Voltage line and the Maximum Load Current line. Each
region is identified by an inductance value and an inductor
code.
C.
Select an appropriate inductor from the several different
manufacturers part numbers listed in
Table 1 or Table 2.
When using Table 2 for selecting the right inductor the
designer must realize that the inductor current rating must
be higher than the maximum peak current flowing through
the inductor. This maximum peak current can be calculated
as follows
:
Ip(max)
where t
on
is the “on” time of the power switch and
For additional information about the inductor, see the
inductor section in the “External Components” section of
this data sheet.
ILoad(max)
Vin–Voutton
2L
ton
Vout
Vin
x
1
fosc
4. Inductor Selection (L1)
A.
Use the inductor selection guide shown in Figures 17
to 21.
B.
From the selection guide, the inductance area intersected
by the 20 V line and 0.8 A line is L330.
C.
Inductor value required is 330 H. From the Table 1 or
Table 2
,
choose an inductor from any of the listed
manufacturers.
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| LM2576R | 3.0A, 15V, Step-Down Switching Regulator |
| LM2577S-12 | Pressure Transducer, Series 19 mm, Uncompensated, Pressure Range: 0 psi to 100 psi, Absolute, flush mount, 10 Vdc excitation |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2575/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Easy Switcher? 1.0 A Step-Down Voltage Regulator |
| LM2575_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.0 A, Adjustable Output Voltage, Step−Down Switching Regulator |
| LM2575_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR |
| LM2575_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:52kHz Simple 1A Buck Regulator |
| LM2575-05IKC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR |
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