4

8

3

6

5

1

2

CVCC

7

LM5007

VCC

FB

SW

BST

VIN

RCL

RTN

RON

RCL

CIN

COUT

Shutdown

RC

CBST

L1

D1

RON

RFB2

RFB1

200

NŸ

CBYP

100

NŸ

0.01 µF

100 µH

1 µF

0.1 µF

0.1 µF

3.01

NŸ

1

NŸ

15 µF

1

Ÿ

VIN

VOUT

12 V to 75 V

10V

13

LM5007

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SNVS252H – SEPTEMBER 2003 – REVISED NOVEMBER 2018

Product Folder Links: LM5007

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Copyright © 2003–2018, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM5007 requires only a few external components to convert from a wide range of supply voltages to a fixed

output voltage. To expedite and streamline the process of designing a LM5007-based converter, a

comprehensive LM5007 quick-start calculator is available for download to assist the designer with component

selection for a given application. WEBENCH® online software is also available to generate complete designs,

leveraging iterative design procedures and access to comprehensive component databases. The following

sections discuss a design procedure using a typical application example. Figure 7 shows the LM5007 in a

configuration suitable for several application use cases. See the LM5007 EVM for more details.

8.2 Typical Application

The application schematic of an LM5007-based buck converter is shown in Figure 7. For an output voltage

(VOUT) above the maximum regulation threshold of VCC (see Electrical Characteristics), the VCC pin can be

supplied from VOUT through a diode for higher efficiency and lower power dissipation in the IC.

Figure 7. 12-V to 75-V Input and 10-V, 400-mA Output Buck Converter

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 2 as the input parameters.

Table 2. Design Parameters

DESIGN PARAMETERS

VALUE

Input Voltage

12 V to 75 V

Output Voltage

10 V

Maximum Output Current

400 mA

Nominal Switching Frequency

380 kHz