參數(shù)資料
型號(hào)： LM2575-15
廠商： Motorola, Inc.
英文描述： EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR
中文描述： 易SWITCHERE⑩1.0降壓穩(wěn)壓器
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 400K
代理商： LM2575-15
LM2575
11
MOTOROLA ANALOG IC DEVICE DATA
Procedure (Adjustable Output Version: LM2575–Adj) (continued)
Procedure
Example
4. Inductor Selection (L1)
A.
Use the following formula to calculate the inductor Volt x
microsecond [V x
μ
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 Ioad.
The inductor current rating can also be determined by
calculating the inductor peak current:
where ton 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
μ
s] constant:
B.
E x T = 51 [V x
μ
s]
C.
ILoad(max) = 1.0 A
Inductance Region = L220
D.
Proper inductor value = 220
μ
H
Choose the inductor from the Table 1 or Table 2.
E x T
(12 – 8.0) x12
x152
51 [V x
s]
5. Output Capacitor Selection (Cout)
A.
Since the LM2575 is a forward–mode switching regulator
with voltage mode control, its open loop 2–pole–2–zero
frequency characteristic has the dominant pole–pair
determined by the output capacitor and inductor values
.
For stable operation, the capacitor must satisfy the
following requirement:
B.
Capacitor values between 10
μ
F and 2000
μ
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 (Cout)
A.
Cout
To achieve an acceptable ripple voltage, select
Cout = 100
μ
F electrolytic capacitor.
7.785
12
8.220
53
μ
F
相關(guān)PDF資料
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LM2575-3.3 EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR
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LM2575-15BU 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
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