herunterladen
Application Report
SNVA475A–March 2011–Revised April 2013
AN-2129 Boot Capacitor Regulation in
LM25007 Constant-On-Time (COT) Converter
.....................................................................................................................................................
ABSTRACT
This application report discusses boot capacitor regulation in the Texas Instruments LM25007 constant-
on-time (cot) converter.
Contents
1 The Issue ..................................................................................................................... 2
2 The Solution ................................................................................................................. 3
2.1 Increasing Boot Capacitor (CBST) ............................................................................... 3
2.2 Reducing Feedback Resistors (RFB1, RFB2) ................................................................. 3
2.3 Raising V
BST
Using External Circuit .............................................................................. 4
List of Figures
1 LM25007 Application with Prebiased Output............................................................................ 2
2 Startup with Prebiased Output ............................................................................................ 2
3 Hiccup Mode Operation at No Load...................................................................................... 3
4 Raising Boot Capacitor Voltage Using External Circuit................................................................ 4
All trademarks are the property of their respective owners.
1
SNVA475A–March 2011–Revised April 2013 AN-2129 Boot Capacitor Regulation in LM25007 Constant-On-Time (COT)
Converter
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated
