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參數(shù)資料
| 型號： | LM2574M-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SMT-14 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LM2574M-3.3 |
LM2574
22
MOTOROLA ANALOG IC DEVICE DATA
The LM2574–ADJ Step–Down Voltage Regulator with 5.0 V @ 0.5 A Output Power Capability Typical
Application With Through–Hole PC Board Layout
D1
1N5819
L1
330
μ
H
Output
7
1
Feedback
R2
6.12 k
R1
2.0 k
L2
22
μ
H
Regulated
Output Filtered
Vout = 5.0 V @ 0.5 A
Output
Ripple Filter
Unregulated
DC Input
C2
220
μ
F
C3
100
μ
F
C1
22
μ
F
LM2574–ADJ
5
3
4
ON/OFF
Pwr
Gnd
+Vin
2
Sig
Gnd
+Vin = 7.0 to 40 V
Gnd
Gnd
C1
C2
C3
D1
L1
L2
R1
R2
–
–
–
–
–
–
–
–
22
μ
F, 63 V, Aluminium Electrolytic
220
μ
F, 16 V, Aluminium Electrolytic
100
μ
F, 16 V Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330
μ
H, RL–1284–330, Renco Electronics
25
μ
H, SFT52501, TDK
2.0 k
, 0.1%, 0.25 W
6.12 k
, 0.1%, 0.25 W
Figure 39. Schematic Diagram of the 5.0 V @ 0.5 A Step–Down Converter Using the LM2574–ADJ
(An additional LC filter is included to achieve low output ripple voltage)
LM2574
C1
C2
+
+
U1
L1
D1
Vout
Gnd
+Vin
C3+
Gnd
L2
R1
R2
Figure 40. PC Board Layout Component Side
NOTE
: Not to scale.
Figure 41. PC Board Layout Copper Side
NOTE
: Not to scale.
References
National Semiconductor LM2574 Data Sheet and Application Note
National Semiconductor LM2594 Data Sheet and Application Note
Marty Brown “Practical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990
Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2574M-5 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHERT 0.5A Step-Down Voltage Regulator(639.73 k) |
| LM2574M-5.0 | 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 |
| LM2574M-5.0 | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A 5.0V SMD 2574 |
| LM2574M-5.0/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.5A 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 |
| LM2574M-ADJ | 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 |
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