Texas Instruments TMS320F2837 D Series Workshop Guide And Lab Manual

ePWM
TMS320F2837xD Microcontroller Workshop - Control Peripherals 7 - 23
PWM Computation Example
Symmetric PWM Computation Example
 Determine TBPRD and CMPA for 100 kHz, 25% duty
symmetric PWM from a 100 MHz time base clock
CMPA = (100% - duty cycle)*TBPRD = 0.75*500 = 375
TBPRD =
f
TBCLK
f
PWM
2
2
11
100 kHz
100 MHz
..
= 500=
Counter
Compare
Period
PWM Pin
f
TBCLK
= 100 MHz
CA
↑
CA
↓
.
.
f
PWM
= 100 kHz
(T
PWM
= 10 ms)
(T
TBCLK
= 10 ns)
Asymmetric PWM Computation Example
 Determine TBPRD and CMPA for 100 kHz, 25% duty
asymmetric PWM from a 100 MHz time base clock
CMPA = (100% - duty cycle)*(TBPRD+1) - 1 = 0.75*(999+1) - 1 = 749
TBPRD =
f
TBCLK
f
PWM
100 kHz
100 MHz
- 1 = 999- 1 =
Counter
Compare
Period
PWM Pin
P
↓
CA
↑
f
TBCLK
= 100 MHz
.
.
f
PWM
= 100 kHz
(T
PWM
= 10 ms)
(T
TBCLK
= 10 ns)

Texas Instruments TMS320F2837 D Series Specifications

General

Brand	Texas Instruments
Model	TMS320F2837 D Series
Category	Microcontrollers
Language	English