SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
In a typical power control loop, a digital controller issues a duty command, usually expressed in a per unit or percentage terms. Assume that for a particular operating point, the demanded duty cycle is 0.405 or 40.5% on time and the required converter PWM frequency is 1.25MHz. In conventional PWM generation with a system clock of 100MHz, the duty cycle choices are in the vicinity of 40.5%. As shown in Figure 22-113, a compare value of 32 counts (duty = 40%) is the closest to 40.5% that can be attained. This is equivalent to an edge position of 320ns instead of the desired 324ns. This data is shown in Table 22-20.
By utilizing the MEP, an edge position much closer to the desired point of 324ns can be achieved. Table 22-20 shows that in addition to the CMPA value, 22 steps of the MEP (CMPAHR register) positions the edge at 323.96ns, resulting in almost zero error. In this example, assume that the MEP has a step resolution of 180ps.
CMPA (count)(1)(2) (3) |
Duty (%) |
High Time (ns) |
CMPA (count) |
CMPAHR (count) |
Duty (%) |
High Time (ns) |
---|---|---|---|---|---|---|
28 | 35.0 | 280 | 32 | 18 | 40.405 | 323.24 |
29 | 36.3 | 290 | 32 | 19 | 40.428 | 323.42 |
30 | 37.5 | 300 | 32 | 20 | 40.450 | 323.60 |
31 | 38.8 | 310 | 32 | 21 | 40.473 | 323.78 |
32 | 40.0 | 320 | 32 | 22 | 40.495 | 323.96 |
33 | 41.3 | 330 | 32 | 23 | 40.518 | 324.14 |
34 | 42.5 | 340 | 32 | 24 | 40.540 | 324.32 |
32 | 25 | 40.563 | 324.50 | |||
Required | 32 | 26 | 40.585 | 324.68 | ||
32.40 | 40.5 | 324 | 32 | 27 | 40.608 | 324.86 |