參數(shù)資料
型號(hào)： LM2576D2T-12
廠商： MOTOROLA INC
元件分類： 穩(wěn)壓器
英文描述： EASY SWITCHERE⑩ 3.0 A STEP-DOWN VOLTAGE REGULATOR
中文描述： 3 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5
封裝： PLASTIC, D2PAK-5
文件頁(yè)數(shù)： 12/26頁(yè)
文件大?。?/td> 278K
代理商： LM2576D2T-12
LM2576
http://onsemi.com
12
Procedure (Adjustable Output Version: LM2576ADJ) (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 22. 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 25.
D.
From the inductor code, identify the inductor value. Then
select an appropriate inductor from Table 2.
The inductor chosen must be rated for a switching
frequency of 52 kHz and for a current rating of 1.15 x
Load
.
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
Vin
x
106
F[Hz][V x s]
Ip(max)
ILoad(max)
Vin– Voutton
2L
ton
Vout
Vin
x1.0
fosc
4. Inductor Selection (L1)
A.
Calculate E x T [V x s] constant:
B.
E x T = 80 [V x s]
C.
I
Load(max)
= 2.5 A
Inductance Region = H150
D.
Proper inductor value = 150 H
Choose the inductor from Table 2.
E x T
(25 – 8.0) x25x152
80 [V x s]
5. Output Capacitor Selection (C
out
)
A.
Since the LM2576 is a forwardmode switching regulator
with voltage mode control, its open loop 2pole1zero
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 8.0 V is appropriate, and a 10 V
or 16 V rating is recommended.
Cout
13,300
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
= 680 F electrolytic capacitor.
13,300 x
25
8 x 150
332.5
μ
F
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2576D2T-15 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:EASY SWITCHERE⑩ 3.0 A STEP-DOWN VOLTAGE REGULATOR
LM2576D2T-15G 功能描述:直流/直流開關(guān)調(diào)節(jié)器 15V 3A Buck PWM 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
LM2576D2T-3.3 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 3A Buck PWM 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
LM2576D2T-3.3G 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 3A Buck PWM 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
LM2576D2T-5 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Easy Switcher 3.0A Step-Down Voltage Regulator
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