LM2574DW-3.3 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
LM2574DW-3.3 Datasheet PDF : 24 Pages
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LM2574
The LM2574–ADJ Step–Down Voltage Regulator with 5.0 V @ 0.5 A Output Power Capability Typical
Application With Through–Hole PC Board Layout
Figure 39. Schematic Diagram of the 5.0 V @ 0.5 A Step–Down Converter Using the LM2574–ADJ
(An additional LC filter is included to achieve low output ripple voltage)
Unregulated
DC Input
+Vin
+Vin = 7.0 to 40 V
5
LM2574–ADJ
Feedback
1
Output
L1
330 µH
L2
22 µH
Regulated
Output Filtered
C1
22 µF
7
4 Pwr 2 Sig 3 ON/OFF
Gnd
Gnd
D1
1N5819
C2
220 µF
R2
6.12 kΩ
R1
2.0 kΩ
C3
100 µF
Vout = 5.0 V @ 0.5 A
Gnd
Gnd
C1 – 22 µF, 63 V, Aluminium Electrolytic
C2 – 220 µF, 16 V, Aluminium Electrolytic
C3 – 100 µF, 16 V Aluminium Electrolytic
D1 – 1.0 A, 40 V, Schottky Rectifier, 1N5819
L1 – 330 µH, RL–1284–330, Renco Electronics
L2 – 25 µH, SFT52501, TDK
R1 – 2.0 kΩ, 0.1%, 0.25 W
R2 – 6.12 kΩ, 0.1%, 0.25 W
Output
Ripple Filter
Figure 40. PC Board Layout Component Side
+
+Vin
C1
LM2574
U1
C2
C3 Gnd
+
+
D1
R1 R2
L2
Gnd
L1
Vout
NOTE: Not to scale.
Figure 41. PC Board Layout Copper Side
NOTE: Not to scale.
References
• National Semiconductor LM2574 Data Sheet and Application Note
• National Semiconductor LM2594 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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MOTOROLA ANALOG IC DEVICE DATA
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