LM2595
THE LM2595 STEP ? DOWN VOLTAGE REGULATOR WITH 5.0 V @ 1.0 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
2
LM2595
Output
L1
68 m H
Regulated
Output Filtered
3
GND
5
1
ON/OFF
R2
3.0 k
C FF
V out2 = 5.0 V @ 1.0 A
C1
100 m F
/50 V
ON/OFF
D1
1N5819
C2
470 m F
/25 V
R1
1.0 k
out + V ref ) 1.0 ) R1
V
R2
C1
C2
D1
L1
R1
R2
C ff
?
?
?
?
?
?
?
100 m F, 50 V, Aluminium Electrolytic
470 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
See Table 1
V ref = 1.23 V
R1 is between 1.0 k and 5.0 k
Figure 32. Schematic Diagram of the 5.0 V @ 1.0 A Step ? Down Converter Using the LM2595 ? 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 LM2595 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
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