lm2575-5 ON Semiconductor, lm2575-5 Datasheet - Page 24

• Manufacturer Part Number: lm2575-5
• Description: 1.0 A, Adjustable Output Voltage, Step-down Switching Regulator
• Manufacturer: ON Semiconductor

References
•
•
•
•
+V
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
in
GND
= +10 V to + 40 V
+V
Figure 39. PC Board Component Side
THE LM2575−ADJ STEP−DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER
in
Unregulated
DC Input
in
C1
Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step−Down Converter Using the LM2575−Adj
100 mF
L1
CAPABILITY. TYPICAL APPLICATION WITH THROUGH−HOLE PC BOARD LAYOUT
/50 V
C1
C2
C3
D1
L1
L2
R1
R2
C1
NOTE: Not to scale.
−
−
−
−
−
−
−
−
U1 LM2575
D1
100 mF, 50 V, Aluminium Electrolytic
330 mF, 16 V, Aluminium Electrolytic
100 mF, 16 V, Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330 mH, Tech 39: 77 458 BV, Toroid Core, Through−Hole, Pin 3 = Start, Pin 7 = Finish
25 mH, TDK: SFT52501, Toroid Core, Through−Hole
1.8 k
10 k
+V
in
1
(An additional LC filter is included to achieve low output ripple voltage)
3
R2 R1
LM2575−Adj
J1
GND
4
C2
Feedback
L2
5
GND
ON/OFF
C3
+V
+V
out2
out1
2
out
Output
http://onsemi.com
D1
1N5819
330 mH
L1
24
C2
330 mF
/16 V
Figure 40. PC Board Copper Side
R2
10 k
R1
1.8 k
V
V
R1 is between 1.0 k and 5.0 k
ref
out
= 1.23 V
+ V
NOTE: Not to scale.
ref
25 mH
100 mF
) 1 ) R2
L2
/16 V
C3
R1
V
V
Regulated
Output Unfiltered
Regulated
Output Filtered
out1
out2
= 8.0 V @1.0 A
= 8.0 V @1.0 A