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參數(shù)資料
| 型號(hào)： | LM2672-3.3MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | DIE |
| 文件頁(yè)數(shù)： | 10/30頁(yè) |
| 文件大小： | 576K |
| 代理商： | LM2672-3.3MDC |
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LM2672 Series Buck Regulator Design Procedure (Adjustable Output)
(Continued)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant E T
(V
s), from the following formula:
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant (E T),
where V
SAT=internal switch saturation voltage=0.25V and
V
D = diode forward voltage drop = 0.5V
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
B. E
T = 21.6 (V s)
C. On the horizontal axis, select the maximum load current.
C. I
LOAD(max) = 1A
D. Identify the inductance region intersected by the E
T value
and the Maximum Load Current value. Each region is identified
by an inductance value and an inductor code (LXX).
D. From the inductor value selection guide shown in
the inductance region intersected by the 21.6 (V
s) horizontal
line and the 1A vertical line is 68 H, and the inductor code is
L30.
E. Select an appropriate inductor from the four manufacturer’s
part numbers listed in
Figure 8. For information on the different
types of inductors, see the inductor selection in the fixed output
voltage design procedure.
E. From the table in
Figure 8, locate line L30, and select an
inductor part number from the list of manufacturers’ part
numbers.
3. Output Capacitor SeIection (C
OUT)
A. Select an output capacitor from the capacitor code selection
guide in
Figure 16. Using the inductance value found in the
inductor selection guide, step 1, locate the appropriate capacitor
code corresponding to the desired output voltage.
3. Output Capacitor SeIection (C
OUT)
A. Use the appropriate row of the capacitor code selection
guide, in
Figure 16. For this example, use the 15–20V row. The
capacitor code corresponding to an inductance of 68 H is C20.
B. Select an appropriate capacitor value and voltage rating,
using the capacitor code, from the output capacitor selection
table in
Figure 17. There are two solid tantalum (surface mount)
capacitor manufacturers and four electrolytic (through hole)
capacitor manufacturers to choose from. It is recommended that
both the manufacturers and the manufacturer’s series that are
listed in the table be used. A table listing the manufacturers’
phone numbers is located in
B. From the output capacitor selection table in
choose a capacitor value (and voltage rating) that intersects the
capacitor code(s) selected in section A, C20.
The capacitance and voltage rating values corresponding to the
capacitor code C20 are the:
Surface Mount:
33 F/25V
Sprague 594D Series.
33 F/25V
AVX TPS Series.
Through Hole:
33 F/25V
Sanyo OS-CON SC Series.
120 F/35V
Sanyo MV-GX Series.
120 F/35V
Nichicon PL Series.
120 F/35V
Panasonic HFQ Series.
Other manufacturers or other types of capacitors may also be
used, provided the capacitor specifications (especially the 100
kHz ESR) closely match the characteristics of the capacitors
listed in the output capacitor table. Refer to the capacitor
manufacturers’ data sheet for this information.
LM2672
www.national.com
18
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| LM2672-12MDC | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC |
| LM2672M-3.3X | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2672EP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features |
| LM2672LD-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features |
| LM2672LD-12/NOPB | 功能描述:IC REG BUCK 12V 1A 16LLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 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 |
| LM2672LD-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM2672LD-3.3/NOPB | 功能描述:IC REG BUCK 3.3V 1A 16-LLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 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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