- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44546 > LM2574HVADJMWC (NATIONAL SEMICONDUCTOR CORP) 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC PDF資料下載
參數(shù)資料
| 型號： | LM2574HVADJMWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 6/33頁 |
| 文件大小： | 814K |
| 代理商： | LM2574HVADJMWC |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第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
LM2574 Series Buck Regulator Design Procedure (Continued)
PROCEDURE (Adjustable Output Voltage Versions)
EXAMPLE (Adjustable Output Voltage Versions)
Given:
V
OUT = Regulated Output Voltage
V
IN(Max) = Maximum Input Voltage
I
LOAD(Max) = Maximum Load Current
F = Switching Frequency
(Fixed at 52 kHz)
Given:
V
OUT = 24V
V
IN(Max) = 40V
I
LOAD(Max) = 0.4A
F = 52 kHz
1. Programming Output Voltage
(Selecting R1 and R2, as
shown in Figure 2)
Use the following formula to select the appropriate resistor
values.
R
1 can be between 1k and 5k. (For best temperature coeffi-
cient and stability with time, use 1% metal film resistors)
1. Programming Output Voltage
(Selecting R1 and R2)
R
2 = 1k (19.511) = 18.51k, closest 1% value is 18.7k
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 8.
C. On the horizontal axis, select the maximum load current.
D. Identify the inductance region intersected by the E
T
value and the maximum load current value, and note the in-
ductor value for that region.
E. Select an appropriate inductor from the table shown in
Fig-
ure 3. Part numbers are listed for three inductor manufactur-
ers. The inductor chosen must be rated for operation at the
LM2574 switching frequency (52 kHz) and for a current rating
of 1.5 x I
LOAD. For additional inductor information, see the in-
ductor section in the application hints section of this data
sheet.
2. Inductor Selection (L1)
A. Calculate E
T(V s)
B. E
T = 185 V s
C. I
LOAD(Max) = 0.4A
D. Inductance Region = 1000
E. Inductor Value = 1000 H
Choose from Pulse Engineer-
ing Part #PE-52631, or Renco Part #RL-1283-1000.
DS011394-16
FIGURE 8. LM2574HV-ADJ Inductor Selection Guide
www.national.com
14
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2574HVN-3.3/NOPB | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| LM2574-5.0MWC | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC |
| LM2574-ADJMWC | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC |
| LM2574N-15/NOPB | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| LM2574M-15/NOPB | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2574HVM-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 |
| LM2574HVM-12/NOPB | 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 |
| LM2574HVM-12/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| LM2574HVM-15 | 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 |
| LM2574HVM-15/NOPB | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。