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参数资料
| 型号： | LM2575T-012G |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, SFM5 |
| 封装： | LEAD FREE, CASE 314D-04, TO-220, 5 PIN |
| 文件页数： | 17/28页 |
| 文件大小： | 492K |
| 代理商： | LM2575T-012G |
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LM2575, NCV2575
http://onsemi.com
24
THE LM2575ADJ STEPDOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER
CAPABILITY. TYPICAL APPLICATION WITH THROUGHHOLE PC BOARD LAYOUT
C1
100 mF, 50 V, Aluminium Electrolytic
C2
330 mF, 16 V, Aluminium Electrolytic
C3
100 mF, 16 V, Aluminium Electrolytic
D1
1.0 A, 40 V, Schottky Rectifier, 1N5819
L1
330 mH, Tech 39: 77 458 BV, Toroid Core, ThroughHole, Pin 3 = Start, Pin 7 = Finish
L2
25 mH, TDK: SFT52501, Toroid Core, ThroughHole
R1
1.8 k
R2
10 k
Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V StepDown Converter Using the LM2575Adj
(An additional LC filter is included to achieve low output ripple voltage)
Figure 39. PC Board Component Side
Figure 40. PC Board Copper Side
Vref = 1.23 V
R1 is between 1.0 k and 5.0 k
D1
1N5819
L1
330
mH
Output
2
R2
10 k
R1
1.8 k
L2
25
mH
Regulated
Output Filtered
Vout2 = 8.0 V @1.0 A
Unregulated
DC Input
C2
330
mF
/16 V
C3
100
mF
/16 V
C1
100
mF
/50 V
LM2575Adj
1
5
3ON/OFF
GND
+Vin
+Vin = +10 V to + 40 V
4
Feedback
Regulated
Output Unfiltered
Vout1 = 8.0 V @1.0 A
Vout + Vref ) 1 )
R2
R1
+Vout1
+Vin
GNDin
C1
L1
C2
D1
J1
U1 LM2575
L2
C3
+Vout2
R2 R1
GNDout
NOTE: Not to scale.
NOTE: Not to scale.
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
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| LM2575T12 | 制造商:Semtech 功能描述:_ |
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| LM2575T-12 LF03 | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 40V 5-Pin(5+Tab) TO-220 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4V to 40V 5-Pin(5+Tab) TO-220 |
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