8.2 Typical Applications

8.2.1 Fixed Output Voltage Version

LM2576HV-

Fixed Output

100 …F

COUT

1000 µF

L

O

A

D

+

L1

100 µH

+

CIN

VIN

UNREGULATED

DC INPUT

+VIN

1

GND

3

ON/OFF

5

2

D1

MBR360

VOUT

Feedback

Output

4

CIN — 100-μF, 75-V, Aluminum Electrolytic COUT — 1000-μF, 25-V, Aluminum Electrolytic D1 — Schottky, MBR360 L1 — 100 μH, Pulse

Eng. PE-92108 R1 — 2 k, 0.1% R2 — 6.12 k, 0.1%

Figure 8-3. Fixed Output Voltage Versions

8.2.1.1 Design Requirements

Table 8-1 lists the design parameters of this example.

Table 8-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Regulated Output Voltage

(3.3 V, 5 V, 12 V, or 15 V), VOUT

5 V

Maximum Input Voltage, VIN(Max)

15 V

Maximum Load Current,

ILOAD(Max)

3 A

8.2.1.2 Detailed Design Procedure

8.2.1.2.1 Custom Design with WEBENCH® Tools

Click here to create a custom design using the WEBENCH Power Designer.

1. Start by entering your VIN, VOUT and IOUT requirements.

2. Optimize your design for key parameters like efficiency, footprint and cost using the optimizer dial and

compare this design with other possible solutions from Texas Instruments.

3. WEBENCH Power Designer provides you with a customized schematic along with a list of materials with real

time pricing and component availability.

4. In most cases, you will also be able to:

• Run electrical simulations to see important waveforms and circuit performance,

• Run thermal simulations to understand the thermal performance of your board,

• Export your customized schematic and layout into popular CAD formats,

• Print PDF reports for the design, and share your design with colleagues.

8.2.1.2.2 Inductor Selection (L1)

1. Select the correct Inductor value selection guide from Figure 8-4, Figure 8-5, Figure 8-6, or Figure 8-7.

(Output voltages of 3.3 V, 5 V, 12 V or 15 V respectively). For other output voltages, see the design

procedure for the adjustable version. Use the selection guide shown in Figure 8-5.

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LM2576, LM2576HV

SNVS107G – JUNE 1999 – REVISED MARCH 2023

Copyright © 2023 Texas Instruments Incorporated

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Product Folder Links: LM2576 LM2576HV