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参数资料
| 型号： | LM2574DW-ADJR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | PLASTIC, SO-16 |
| 文件页数： | 15/24页 |
| 文件大小： | 396K |
| 代理商： | LM2574DW-ADJR2 |
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
H
Output
7
1
Feedback
R2
6.12 k
R1
2.0 k
L2
22
H
Regulated
Output Filtered
Vout = 5.0 V @ 0.5 A
Output
Ripple Filter
Unregulated
DC Input
C2
220
F
C3
100
F
C1
22
F
LM2574–ADJ
5
3
4ON/OFF
Pwr
Gnd
+Vin
2
Sig
Gnd
+Vin = 7.0 to 40 V
Gnd
C1
–
22
F, 63 V, Aluminium Electrolytic
C2
–
220
F, 16 V, Aluminium Electrolytic
C3
–
100
F, 16 V Aluminium Electrolytic
D1
–
1.0 A, 40 V, Schottky Rectifier, 1N5819
L1
–
330
H, RL–1284–330, Renco Electronics
L2
–
25
H, SFT52501, TDK
R1
–
2.0 k
, 0.1%, 0.25 W
R2
–
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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相关代理商/技术参数 |
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|---|---|
| LM2574DW-ADJR2G | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2574HV | 制造商:NSC 制造商全称:National Semiconductor 功能描述: |
| LM2574HVM-12 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2574HVM-12/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2574HVM-12/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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