参数资料
型号: LM2594PADJG
厂商: ON Semiconductor
文件页数: 22/25页
文件大小: 0K
描述: IC REG BUCK ADJ 0.5A 8DIP
标准包装: 50
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.23 V ~ 37 V
输入电压: 4.5 V ~ 40 V
PWM 型: 电压模式
频率 - 开关: 150kHz
电流 - 输出: 500mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
供应商设备封装: 8-PDIP
LM2594
THE LM2594 STEP ? DOWN VOLTAGE REGULATOR WITH 5.0 V @ 0.5 A OUTPUT POWER CAPABILITY.
TYPICAL APPLICATION WITH THROUGH ? HOLE PC BOARD LAYOUT
Unregulated
4
Feedback
DC Input
+V in = 10 V to 40 V
+V in
7
LM2594
Output
L1
100 m H
Regulated
Output Filtered
6
GND
5
8
ON/OFF
R2
3.0 k
C FF
V out2 = 5.0 V @ 0.5 A
C1
100 m F
/50 V
ON/OFF
D1
1N5819
C2
220 m F
/25 V
R1
1.0 k
out + V ref ) 1.0 ) R1
V
R2
C1
C2
D1
L1
R1
R2
?
?
?
?
?
?
100 m F, 50 V, Aluminium Electrolytic
220 m F, 25 V, Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
100 m H, DO3340P, Coilcraft
1.0 k W , 0.25 W
3.0 k W , 0.25 W
V ref = 1.23 V
R1 is between 1.0 k and 5.0 k
Figure 32. Schematic Diagram of the 5.0 V @ 0.5 A Step ? Down Converter Using the LM2594 ? ADJ
NOTE: Not to scale.
Figure 33. Printed Circuit Board Layout With
Component
NOTE: Not to scale.
Figure 34. Printed Circuit Board Layout
Copper Side
References
? National Semiconductor LM2594 Data Sheet and Application Note
? National Semiconductor LM2595 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
http://onsemi.com
22
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