LM2597HV Reference Design - Buck Converter Circuit with Reduced Output Ripple: 9-60V Input, 12V @ 1.5A Output

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  Design Specifications
Inputs Outputs #1
VinMin=9 Vout1=12
VinMax=60 Iout1=1.5
   Design Resources
LM2597HV Reference Design

  Additional Resources

•LM2597HV Product Folder
    Bill Of Materials
Part Manufacturer Part# Attributes
Cdelay Optional Optional
Cff Vitramon VJ0805A101KXAA 100p F
Cin TDK C45X7R2A105M NumCaps=1, 1u F
Cout1 Sprague 293D156X9035E2 NumCaps=1, 15u F
Cout2 Optional Optional NumCaps=1
Css Vitramon VJ1206Y104KXAA 0.1u F
D1 ONSEMI MBRS1100TR 0.75 V
L1 Coilcraft DO3316-334 330u H, 0.81 Ohms
L2 Optional Optional
R1 Dale CRCW12062002F 20k Ohms
R2 Dale CRCW12063743F 374k Ohms
RPullUp Optional Optional
U1 National Semiconductor LM2597HV

  Design Description
The design uses a LM2597HV simple switcher buck regulator operating at 150kHz. A second stage filter is added to further reduce the output ripple.

Careful PC board layout is critical to achieve low switching losses and clean, stable operation. The switching power stage requires particular attention. Few points to note for this design are:

1) Decoupling capacitors are close to IC pins as possible. Keep separate power ground plane.

2) Input and output capacitors are connected to the power ground plane; all other capacitors are connected to the signal ground plane.

3) High current paths are very short.

4) Multiple MOSFETs have been used to reduce the conduction and switching losses

5) Feedback connections are short and direct and routed away from any noisy traces (i.e. switch node).

6) High-side MOSFETs are as close as possible to the controller



  Schematic
Example Schematic Showing Connection for all Components.