AN2517 Freescale Semiconductor / Motorola, AN2517 Datasheet - Page 19

• Manufacturer Part Number: AN2517
• Description: 3-Phase Sine Wave Generator with Dead-Time Correction TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Freescale Semiconductor, Inc.
AN2517/D
Detailed Function Description
When other functions are running concurrently on the same TPU, the longest
state of each function with its time-slot transition can increase the calculated
MPW value. The 3SinDt_fault function does not affect the MPW. The
3SinDt_sync, if used, increases the MPW value by 22 (44 IMB clock cycles).
The 3SinDt_res, if used, increases the MPW value by 20 (40 IMB clock cycles).
If a lower value than the one calculated, is set for the MPW parameter, the
motion system can run with a higher motor voltage amplitude, but with risk, that
the dead-time is not maintained.
It is also possible to use the Worst-Case Latency (WCL), which is automatically
calculated by the MPC500_Quick_Start Graphical Configuration Tool. It can
serve as a good approximation of MPW. The calculated WCL is always longer
than the real-case is. Let the WCL be calculated after the configuration of TPU
channels and then find the longest WCL value within all 3SinDt PWM channels.
Convert the number, from IMB clock cycles to TCR1 clock cycles, to get the
MPW.
MOTOROLA 3-Phase Sine Wave Generator with Dead-Time Correction TPU Function Set (3SinDt)
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