mps-dc-dc模块讲解.ppt

DCDC Introduction
DCDC拓扑原理
EMI处理
Layout (另外文档)
损耗分析(另外文档)
DCDC Topologies
Non-Sync BUCK
Sync BUCK
Non-Sync BOOST
Sync BOOST
MOS管内有体二极管
Background
Connecting the power supply reversely will damage ICs. So some customer want to use reverse protection circuit especially for battery powered system
注意带电池系统
MPS Sync BUCK
MPS Non-Sync and Sync BOOST
DCDC拓扑原理
EMI处理
Layout (另外文档)
损耗分析(另外文档)
IC规格书讲解
EMC Design/Schematic
首先是Layout
然后再考虑增加器件
Background-EMI Improvement
R5 is always used to adjust the switching speed of
Highside FET, so that the SW spike can be reduced
But….
Impact of BST Resistor Change
BST Resistance=100Ohm
BST Resistance=1kOhm
Pay Attention to the BST Resistance!!
We suggest BST R<50Ohm normally