E910.27A View Datasheet(PDF) - ELMOS Semiconductor AG

Part Name

Description

MFG CO.

E910.27A

External Adjustable High Efficiency PFM Step-Down Converter

ELMOS Semiconductor AG 

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- Preliminary -

E910.27A

7.8.4 Continuous Mode PFM Control Behaviour..................................................................................22

7.8.5 Leading Edge Blanking................................................................................................................24

7.8.6 Run Away at Start-up and Output Short......................................................................................25

8 Design Information.......................................................................................................................................26

8.1 Design Guidelines................................................................................................................................26

8.1.1 Output Voltage Setting.................................................................................................................26

8.1.2 Current Sense Resistor Selection...............................................................................................26

8.1.3 Choosing the Choke Value..........................................................................................................27

8.1.4 Choosing the Input and the Output Capacitor.............................................................................28

8.1.5 Catch Diode Selection.................................................................................................................30

8.1.6 Snubber Network Design ............................................................................................................30

8.1.7 Maximum available Output Current versus Internal Losses and Operating Temperature .........31

9 PCB Layout Considerations.........................................................................................................................34

10 Applications Information ............................................................................................................................35

10.1 Block X1.............................................................................................................................................36

10.1.1 Block Diagram............................................................................................................................36

10.1.2 Functional Description...............................................................................................................36

10.2 Application Gallery.............................................................................................................................37

11 Package.....................................................................................................................................................43

11.1 Marking..............................................................................................................................................43

11.1.1 Top Side.....................................................................................................................................43

11.1.2 Bottom Side...............................................................................................................................43

11.2 Package Dimensions.........................................................................................................................44

12 General.......................................................................................................................................................46

12.1 ELMOS Documents...........................................................................................................................46

13 Record of Revisions...................................................................................................................................47

14 Index...........................................................................................................................................................48

ELMOS Semiconductor AG

Specification 49 / 50

03SP0357E.00 05.09.2006

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