PFC SPM
®
Design Guide
© 2005
Rev. 1.0.1-2012
Fairchild Semiconductor – System Engineering Group
2
Contents
1.
System Configurations ........................................................................... 3
2.
Protection Circuits .................................................................................. 3
Over Current Protection (OCP) .............................................................................................................. 3
Over Voltage Protection ......................................................................................................................... 4
Under Voltage Protection ....................................................................................................................... 4
3.
Design Example (PFC SPM® DEMO BOARD) ...................................... 5
Operating conditions of PFC SPM® demo board: .................................................................................. 5
Output capacitance and Inductance design ............................................................................................ 5
Output Voltage Ripple & Output Capacitance ...................................................................................... 5
Inductance & Input Current Ripple ....................................................................................................... 6
Open Loop Response ............................................................................................................................... 6
Current Loop Amplifier .......................................................................................................................... 7
Voltage Loop Amplifier .......................................................................................................................... 7
Control Loop Implementation ................................................................................................................ 8
Current Loop .......................................................................................................................................... 8
Voltage Loop ......................................................................................................................................... 10
Other Parameters ................................................................................................................................. 10
Over Current Protection ....................................................................................................................... 12
Over Voltage Protection ....................................................................................................................... 13
DC-link Voltage Control .......................................................................................................................... 14
4.
Experimental Results ........................................................................... 15
NOTE:
In this and other Fairchild documentation and collateral, the following terms are interchangeable:
DIP = SPM2, Mini-DIP = SPM3, Tiny-DIP = SPM5, µMini-DIP = SPM45H, PFCM = PFC SPM®.
