參數(shù)資料
型號(hào)： LM2576-15MDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 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(yè)數(shù)： 5/27頁(yè)
文件大?。?/td> 741K
代理商： LM2576-15MDC
LM2576 Series Buck Regulator Design Procedure (Continued)
PROCEDURE (Adjustable Output Voltage Versions)
EXAMPLE (Adjustable Output Voltage Versions)
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant,
E
T(V
s),
from
the
following
formula:
B. Use the E
T value from the previous formula and
match it with the E
T number on the vertical axis of the
Inductor Value Selection Guide shown in
Figure 7.
C. On the horizontal axis, select the maximum load cur-
rent.
D. Identify the inductance region intersected by the E
T
value and the maximum load current value, and note the
inductor code for that region.
E. Identify the inductor value from the inductor code, and
select an appropriate inductor from the table shown in
Figure 9. 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.
2. Inductor Selection (L1)
A. Calculate E
T(V s)
B. E
T = 115 V s
C. I
LOAD(Max) = 3A
D. Inductance Region = H150
E. Inductor Value = 150 H
Choose from AIE part
#415-0936 Pulse Engineering part #PE-531115, or
Renco part #RL2445.
3. 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, the capacitor must
satisfy the following requirement:
The above formula yields capacitor values between 10 F
and 2200 F that will satisfy the loop requirements for
stable operation. But to achieve an acceptable output
ripple voltage, (approximately 1% of the output voltage)
and transient response, the output capacitor may need to
be several times larger than the above formula yields.
B. The capacitor’s voltage rating should be at last 1.5
times greater than the output voltage. For a 10V regulator,
a rating of at least 15V or more is recommended. Higher
voltage electrolytic capacitors generally have lower ESR
numbers, and for this reason it may be necessary to se-
lect a capacitor rate for a higher voltage than would nor-
mally be needed.
3. Output Capacitor Selection (C
OUT)
However, for acceptable output ripple voltage select
C
OUT ≥ 680 F
C
OUT = 680 F electrolytic capacitor
4. 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.
See diode selection guide in
Figure 8.
B. The reverse voltage rating of the diode should be at
least 1.25 times the maximum input voltage.
4. Catch Diode Selection (D1)
A. For this example, a 3.3A current rating is adequate.
B. Use a 30V 31DQ03 Schottky diode, or any of the sug-
gested fast-recovery diodes in
Figure 8.
5. Input Capacitor (C
IN)
An aluminum or tantalum electrolytic bypass capacitor lo-
cated close to the regulator is needed for stable opera-
tion.
5. Input Capacitor (C
IN)
A 100 F aluminum electrolytic capacitor located near the
input and ground pins provides sufficient bypassing.
www.national.com
13
相關(guān)PDF資料
PDF描述
LM2576-12MWC 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
LM2577SX-15/NOPB 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
LM2578N 0.75 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDIP8
LM2591HVADJMWC 3 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
LM2592HVADJMWC 4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2576-3.3 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:Easy Switcher 3.0A Step-Down Voltage Regulator
LM2576-3.3BT 功能描述:IC REG BUCK 3.3V 3A TO220-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12
LM2576-3.3BT⒂ 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:52kHz Simple 3A Buck Voltage Regulator
LM2576-3.3BU 功能描述:IC REG BUCK 3.3V 3A TO263-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12
LM2576-3.3BU TR 功能描述:IC REG BUCK 3.3V 3A TO263-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*