Texas Instruments 28xxx User Manual

Contents
Preface ............................................................................................................................... 9
1 Introduction ............................................................................................................. 13
1.1 Introduction ......................................................................................................... 14
1.2 Submodule Overview ............................................................................................. 14
1.3 Register Mapping .................................................................................................. 17
2 ePWM Submodules ................................................................................................... 19
2.1 Overview ............................................................................................................ 20
2.2 Time-Base (TB) Submodule ..................................................................................... 23
2.2.1 Purpose of the Time-Base Submodule ................................................................ 23
2.2.2 Controlling and Monitoring the Time-base Submodule .............................................. 24
2.2.3 Calculating PWM Period and Frequency .............................................................. 25
2.2.4 Phase Locking the Time-Base Clocks of Multiple ePWM Modules ................................ 30
2.2.5 Time-base Counter Modes and Timing Waveforms ................................................. 30
2.3 Counter-Compare (CC) Submodule ............................................................................ 32
2.3.1 Purpose of the Counter-Compare Submodule ....................................................... 33
2.3.2 Controlling and Monitoring the Counter-Compare Submodule ..................................... 33
2.3.3 Operational Highlights for the Counter-Compare Submodule ...................................... 34
2.3.4 Count Mode Timing Waveforms ....................................................................... 34
2.4 Action-Qualifier (AQ) Submodule ............................................................................... 37
2.4.1 Purpose of the Action-Qualifier Submodule .......................................................... 37
2.4.2 Action-Qualifier Submodule Control and Status Register Definitions ............................. 37
2.4.3 Action-Qualifier Event Priority .......................................................................... 40
2.4.4 Waveforms for Common Configurations .............................................................. 41
2.5 Dead-Band Generator (DB) Submodule ....................................................................... 50
2.5.1 Purpose of the Dead-Band Submodule ............................................................... 50
2.5.2 Controlling and Monitoring the Dead-Band Submodule ............................................. 50
2.5.3 Operational Highlights for the Dead-Band Submodule .............................................. 51
2.6 PWM-Chopper (PC) Submodule ................................................................................ 55
2.6.1 Purpose of the PWM-Chopper Submodule ........................................................... 55
2.6.2 Controlling the PWM-Chopper Submodule ........................................................... 55
2.6.3 Operational Highlights for the PWM-Chopper Submodule .......................................... 55
2.6.4 Waveforms ................................................................................................ 56
2.7 Trip-Zone (TZ) Submodule ....................................................................................... 59
2.7.1 Purpose of the Trip-Zone Submodule ................................................................. 59
2.7.2 Controlling and Monitoring the Trip-Zone Submodule ............................................... 60
2.7.3 Operational Highlights for the Trip-Zone Submodule ................................................ 60
2.7.4 Generating Trip Event Interrupts ....................................................................... 62
2.8 Event-Trigger (ET) Submodule .................................................................................. 63
2.8.1 Operational Overview of the Event-Trigger Submodule ............................................. 64
3 Applications to Power Topologies .............................................................................. 69
3.1 Overview of Multiple Modules ................................................................................... 70
3.2 Key Configuration Capabilities................................................................................... 70
3.3 Controlling Multiple Buck Converters With Independent Frequencies ..................................... 71
SPRU791D – November 2004 – Revised October 2007 Contents 3
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Texas Instruments 28xxx Specifications

General

Brand	Texas Instruments
Model	28xxx
Category	Accessories
Language	English