- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44547 > LM2575D2TR4-12 (ON SEMICONDUCTOR) 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 PDF資料下載
參數(shù)資料
| 型號： | LM2575D2TR4-12 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | PLASTIC, D2PAK-5 |
| 文件頁數(shù)： | 3/62頁 |
| 文件大小： | 1103K |
| 代理商： | LM2575D2TR4-12 |
第1頁第2頁當(dāng)前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁
LM2575
3–123
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
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 IIoad.
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.
ExT
+ V
in
–Vout
Vout
Von
x
106
F[Hz]
[V x
ms]
I
p(max)
+ I
Load(max) )
V
in
–Vout ton
2L
ton +
Vout
V
in
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. ILoad(max) = 1.0 A
Inductance Region = L220
D. Proper inductor value = 220
H
Choose the inductor from the Table 1 or Table 2.
ExT
+ (12 – 8.0) x 8.0
12
x
1000
52
+ 51 [V x ms]
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
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.
C
out w
7.785
V
in(max)
Vout xL [H]
[
F]
5. Output Capacitor Selection (Cout)
A.
To achieve an acceptable ripple voltage, select
Cout = 100 F electrolytic capacitor.
C
out w
7.785
12
8.220
+ 53 F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2575D2TR4-5 | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575HVT-5.0FLOWLB03/NOPB | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| LM2575HVT-ADJFLOWLB03/NOPB | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| LM2575T-ADJFLOWLB03/NOPB | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| LM2575IKC | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2575EP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
| LM2575HV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
| LM2575HVM12 | 制造商:Texas Instruments 功能描述:* |
| LM2575HVM-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
| LM2575HVM-12/NOPB | 功能描述:IC REG BUCK 12V 1A 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。