lm2575-5 ON Semiconductor, lm2575-5 Datasheet - Page 22

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

1N5242B
Unregulated
DC Input
+
+V
NOTE: This picture does not show the complete circuit.
15 k
15 k
Figure 32. Undervoltage Lockout Circuit for
R2
Z1
R1
in
100 mF
/50 V
C
in
68 k
R3
Buck−Boost Converter
Q1
2N3904
+V
in
1
3
C
100 mF
LM2575−Adj
+V
in
GND
in
1
Figure 33. Adjustable Power Supply with Low Ripple Voltage
5
80
70
60
50
40
30
LM2575−5.0
Figure 34. D
5
0
ON/OFF
Power Dissipation versus P.C.B. Copper Length
ON/OFF
2
4
Vertically
Output
Mounted
Feedback
Free Air
3
5.0
GND
V
2
V
out
PAK Thermal Resistance and Maximum
th
L, LENGTH OF COPPER (mm)
≈ 13 V
= -5.0 V
http://onsemi.com
D1
1N5819
10
150 mH
Minimum
Size Pad
L1
P
R
22
15
D(max)
qJA
Adjustable Output, Low−Ripple Power Supply
features an adjustable output voltage is shown in Figure 33.
The input voltage ranges from roughly 8.0 V to 40 V. In order
to achieve a 10 or more times reduction of output ripple, an
additional L−C filter is included in this circuit.
for T
A 1.0 A output current capability power supply that
This regulator delivers 1.0 A into 1.2 V to 35 V output.
C
2200 mF
out
A
20
= 50°C
L
Î Î Î Î
Î Î Î Î
Î Î Î Î
Î Î Î Î
2.0 oz. Copper
25
L
R2
50 k
R1
1.1 k
30
3.5
3.0
2.5
2.0
1.5
1.0
Optional Output
Ripple Filter
20 mH
100 mF
L2
C1
Regulated
Output Voltage
1.2 V to 35 V @1.0 A