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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)： | 11/28頁 |
| 文件大?。?/td> | 363K |
| 代理商： | LM2575 |
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LM2575
http://onsemi.com
11
Procedure (Adjustable Output Version:
LM2575Adj) (continued)
Procedure
Example
4. Inductor Selection (L1)
A.
Use the following formula to calculate the inductor Volt x
microsecond [V x s] constant:
B.
Match the calculated E x T value with the corresponding
number on the vertical axis of the Inductor Value Selection
Guide shown in
Figure 21. This E x T constant is a measure
of the energy handling capability of an inductor and is
dependent upon the type of core, the core area, the number
of turns, and the duty cycle.
C.
Next step is to identify the inductance region intersected by
the E x T value and the maximum load current value on the
horizontal axis shown in
Figure 21.
D.
From the inductor code, identify the inductor value. Then
select an appropriate inductor from the Table 1 or Table 2.
The inductor chosen must be rated for a switching
frequency of 52 kHz and for a current rating of 1.15 x
I
Ioad
.
The inductor current rating can also be determined by
calculating the inductor peak current
:
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.
E x T
Vin– Vout
Vout
Von
x
106
F[Hz][V x s]
Ip(max)
ILoad(max)
Vin– Voutton
2L
ton
Vout
Vin
x
1
fosc
4. Inductor Selection (L1)
A.
Calculate E x T [V x s] constant:
B.
E x T = 51 [V x s]
C.
I
Load(max)
= 1.0 A
Inductance Region = L220
D.
Proper inductor value = 220 H
Choose the inductor from the Table 1 or Table 2.
E x T
(12 – 8.0) x12x152
51 [V x s]
5. Output Capacitor Selection (C
out
)
A.
Since the LM2575 is a forwardmode switching regulator
with voltage mode control, its open loop 2pole2zero
frequency characteristic has the dominant polepair
determined by the output capacitor and inductor values
.
For stable operation, the capacitor must satisfy the
following requirement:
B.
Capacitor values between 10 F and 2000 F will satisfy
the loop requirements for stable operation. To achieve an
acceptable output ripple voltage and transient response, the
output capacitor may need to be several times larger than
the above formula yields.
C.
Due to the fact that the higher voltage electrolytic capacitors
generally have lower ESR (Equivalent Series Resistance)
numbers, the output capacitor’s voltage rating should be at
least 1.5 times greater than the output voltage. For a 5.0 V
regulator, a rating of at least 8V is appropriate, and a 10 V
or 16 V rating is recommended.
Cout
7.785
Vin(max)
Voutx L [
μ
H][
μ
F]
5. Output Capacitor Selection (C
out
)
A.
Cout
To achieve an acceptable ripple voltage, select
C
out
= 100 F electrolytic capacitor.
7.785
12
8.220
53
μ
F
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| LM2576D2T-12 | EASY SWITCHER 3.0 A STEP.DOWN VOLTAGE REGULATOR |
| LM2576D2T-12 | EASY SWITCHERE⑩ 3.0 A STEP-DOWN VOLTAGE REGULATOR |
| 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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