Texas Instruments 28xxx, TMS320x28xx manual Contents

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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