參數(shù)資料
型號(hào)： LM2574
廠商： ON SEMICONDUCTOR
英文描述： 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator(0.5A,可調(diào)輸出電壓,降壓型開關(guān)穩(wěn)壓器)
中文描述： 0.5甲，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器（0.5A的，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器）
文件頁數(shù)： 23/26頁
文件大小： 295K
代理商： LM2574
LM2574, NCV2574
http://onsemi.com
23
The LM2574ADJ StepDown Voltage Regulator with 5.0 V @ 0.5 A Output Power Capability Typical
Application With ThroughHole 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
V
out
= 5.0 V @ 0.5 A
Output
Ripple Filter
Unregulated
DC Input
C2
220 F
C3
100 F
C1
22 F
LM2574ADJ
5
3
4
ON/OFF
(5)
Pwr
Gnd
(6)
+V
in
2
Sig
Gnd
(4)
+V
in
= 7.0 to 40 V
Gnd
Gnd
C1
C2
C3
D1
L1
L2
R1
R2
22 F, 63 V, Aluminium Electrolytic
220 F, 16 V, Aluminium Electrolytic
100 F, 16 V Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330 H, RL1284330, Renco Electronics
25 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 StepDown Converter Using the LM2574ADJ
(An additional LC filter is included to achieve low output ripple voltage)
(12)
(3)
(14)
LM2574
C1
C2
+
+
U1
L1
D1
V
out
Gnd
+V
in
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
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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