LM2575D2T-12 ON Semiconductor, LM2575D2T-12 Datasheet - Page 23

• Manufacturer Part Number: LM2575D2T-12
• Description: EASY SWITCHERE 1.0 A STEP-DOWN VOLTAGE REGULATOR
• Manufacturer: ON Semiconductor

References
MOTOROLA ANALOG IC DEVICE DATA
+V in = +10 V to + 40 V
National Semiconductor LM2575 Data Sheet and Application Note
National Semiconductor LM2595 Data Sheet and Application Note
Marty Brown “Pratical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990
Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995
Gnd in
+V in
Figure 39. PC Board Component Side
THE LM2575–ADJ STEP–DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER
C1
Unregulated
DC Input
Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step–Down Converter Using the LM2575–Adj
L1
100 F
/50 V
CAPABILITY. TYPICAL APPLICATION WITH THROUGH–HOLE PC BOARD LAYOUT
C1
C2
C3
D1
L1
L2
R1
R2
C1
NOTE: Not to scale.
–
–
–
–
–
–
–
–
U1 LM2575
D1
100 F, 50 V, Aluminium Electrolytic
330 F, 16 V, Aluminium Electrolytic
100 F, 16 V, Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330 H, Tech 39: 77 458 BV, Toroid Core, Through–Hole, Pin 3 = Start, Pin 7 = Finish
25 H, 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)
R2 R1
3
LM2575–Adj
J1
Gnd
C2
4
Feedback
L2
5
+V out2
Gnd out
C3
+V out1
ON/OFF
2
Output
D1
1N5819
LM2575
330 H
L1
C2
330 F
/16 V
Figure 40. PC Board Copper Side
R2
10 k
R1
1.8 k
V
V ref = 1.23 V
R1 is between 1.0 k and 5.0 k
out
+
NOTE: Not to scale.
V
ref
25 H
100 F
)
L2
/16 V
C3
1
)
R2
R1
V out1 = 8.0 V @1.0 A
V out2 = 8.0 V @1.0 A
Regulated
Output Unfiltered
Regulated
Output Filtered
MOTOROLA
23