参数资料
型号: LM2575D2T-3.3
厂商: ON Semiconductor
文件页数: 24/28页
文件大小: 0K
描述: IC REG BUCK 3.3V 1A D2PAK
产品变化通告: Product Discontinuation 27/Jun/2007
标准包装: 50
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 3.3V
输入电压: 4.75 V ~ 40 V
PWM 型: 电压模式
频率 - 开关: 52kHz
电流 - 输出: 1A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
包装: 管件
供应商设备封装: D2PAK
LM2575, NCV2575
THE LM2575 ? ADJ STEP ? DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER
CAPABILITY. TYPICAL APPLICATION WITH THROUGH ? HOLE PC BOARD LAYOUT
Regulated
Output Unfiltered
V out1 = 8.0 V @1.0 A
Unregulated
4
Feedback
DC Input
+V in = +10 V to + 40 V
C1
100 m F
/50 V
+V in
1
3
LM2575 ? Adj
GND
5
Output
2
ON/OFF
L1
330 m H
D1
1N5819
C2
330 m F
/16 V
R2
10 k
R1
1.8 k
L2
25 m H
C3
100 m F
/16 V
Regulated
Output Filtered
V out2 = 8.0 V @1.0 A
out + V ref ) 1 ) R1
V
R2
100 m F, 50 V, Aluminium Electrolytic
330 m F, 16 V, Aluminium Electrolytic
C1
C2
C3
D1
L1
L2
R1
R2
?
?
?
?
?
?
?
?
V ref = 1.23 V
R1 is between 1.0 k and 5.0 k
100 m F, 16 V, Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330 m H, Tech 39: 77 458 BV, Toroid Core, Through ? Hole, Pin 3 = Start, Pin 7 = Finish
25 m H, TDK: SFT52501, Toroid Core, Through ? Hole
1.8 k
10 k
Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step ? Down Converter Using the LM2575 ? Adj
(An additional LC filter is included to achieve low output ripple voltage)
GND in
C1
U1 LM2575
C2
GND out
C3
L1
D1
J1
+V in
R2 R1
L2
+V out2
+V out1
NOTE: Not to scale.
Figure 39. PC Board Component Side
NOTE: Not to scale .
Figure 40. PC Board Copper Side
References
? National Semiconductor LM2575 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
24
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