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參數(shù)資料
| 型號： | LM2576HV-5MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 2/27頁 |
| 文件大?。?/td> | 741K |
| 代理商： | LM2576HV-5MDC |
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LM2576 Series Buck Regulator Design Procedure
PROCEDURE (Fixed Output Voltage Versions)
EXAMPLE (Fixed Output Voltage Versions)
Given:
V
OUT = Regulated Output Voltage
(3.3V, 5V, 12V, or 15V)
V
IN(Max) = Maximum Input Voltage
I
LOAD(Max) = Maximum Load Current
Given:
V
OUT = 5V
V
IN(Max) = 15V
I
LOAD(Max) = 3A
1. Inductor Selection (L1)
A. Select the correct Inductor value selection guide from
Figures 3, 4, 5 or Figure 6. (Output voltages of 3.3V, 5V,
12V or 15V respectively). For other output voltages, see
the design procedure for the adjustable version.
B. From the inductor value selection guide, identify the in-
ductance region intersected by V
IN(Max) and ILOAD(Max),
and note the inductor code for that region.
C. Identify the inductor value from the inductor code, and
select an appropriate inductor from the table shown in
Figure 3. Part numbers are listed for three inductor manu-
facturers. The inductor chosen must be rated for opera-
tion at the LM2576 switching frequency (52 kHz) and for a
current rating of 1.15 x I
LOAD. For additional inductor in-
formation, see the inductor section in the Application
Hints section of this data sheet.
1. Inductor Selection (L1)
A. Use the selection guide shown in
Figure 4.
B. From the selection guide, the inductance area inter-
sected by the 15V line and 3A line is L100.
C. Inductor value required is 100 H. From the table in
Figure 3. Choose AIE 415-0930, Pulse Engineering
PE92108, or Renco RL2444.
2. Output Capacitor Selection (C
OUT)
A. The value of the output capacitor together with the in-
ductor defines the dominate pole-pair of the switching
regulator loop. For stable operation and an acceptable
output ripple voltage, (approximately 1% of the output
voltage) a value between 100 F and 470 F is recom-
mended.
B. The capacitor’s voltage rating should be at least 1.5
times greater than the output voltage. For a 5V regulator,
a rating of at least 8V is appropriate, and a 10V or 15V
rating is recommended.
Higher voltage electrolytic capacitors generally have
lower ESR numbers, and for this reason it may be neces-
sary to select a capacitor rated for a higher voltage than
would normally be needed.
2. Output Capacitor Selection (C
OUT)
A. C
OUT = 680 F to 2000 F standard aluminum electro-
lytic.
B.Capacitor voltage rating = 20V.
3. Catch Diode Selection (D1)
A.The catch-diode current rating must be at least 1.2
times greater than the maximum load current. Also, if the
power supply design must withstand a continuous output
short, the diode should have a current rating equal to the
maximum current limit of the LM2576. The most stressful
condition for this diode is an overload or shorted output
condition.
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, a 3A current rating is adequate.
B. Use a 20V 1N5823 or SR302 Schottky diode, or any of
the suggested fast-recovery diodes shown in
Figure 8.
4. Input Capacitor (C
IN)
An aluminum or tantalum electrolytic bypass capacitor lo-
cated close to the regulator is needed for stable opera-
tion.
4. Input Capacitor (C
IN)
A 100 F, 25V aluminum electrolytic capacitor located
near the input and ground pins provides sufficient
bypassing.
www.national.com
10
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| LM2576HV-ADJ | 制造商:FCI 制造商全稱:First Components International 功能描述:SMIPLE SWITCHER 3.0A Step-Down Voltage Regulator |
| LM2576HVS-12 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2576HVS-12/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3A STEP-DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2576HVS-15 | 功能描述:IC REG BUCK 15V 3A TO263-5 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 |
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