Copyright © 2016, Texas Instruments Incorporated

FB

VIN

SW

RTN

BST

LM5008A

8

6

5

3

4

1

2

7

SHUTDOWN

VCC

RCL

RT/SD

12 - 95V

Input

324k

C1

1.0 µF

RT

RCL

332k

RFB1

1.0k

RFB2

3.01k

R3

3.0

GND

C2

22 µF

VOUT

10.0V

L1

220 PH

C3

0.47 µF

C4

0.01 µF

D1

C5

0.1 µF

13

LM5008A

www.ti.com

SNVS583H – MARCH 2009 – REVISED OCTOBER 2018

Product Folder Links: LM5008A

Submit Documentation Feedback

Copyright © 2009–2018, 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

LM5008A 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 LM5008A-based converter, a

comprehensive LM5008A Quick-Start tool 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 10 shows the LM5008A in a

configuration suitable for several application use cases. See the LM5008A EVM for more details.

8.2 Typical Application

The final circuit is shown in Figure 10. The circuit was tested, and the resulting performance is shown in

Figure 14 and Figure 15.

Figure 10. LM5008A Example Circuit

8.2.1 Design Requirements

A guide for determining the component values is shown in Figure 10. Table 1 lists the bill of materials for this

application example. The following steps configure the LM5008A:

•

Input voltage range (VIN): 12 V to 95 V

•

Output voltage (VOUT1): 10 V

•

Load current (for continuous conduction mode): 100 mA to 300 mA