AN2515 Freescale Semiconductor / Motorola, AN2515 Datasheet - Page 11

• Manufacturer Part Number: AN2515
• Description: 3-Phase Sine Wave Generator - 3 outputs version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Minimum Pulse Width
MOTOROLA
Phase A
Phase B
Phase C
HSR = 10
INIT
NOTE:
3-Phase Sine Wave Generator – 3 outputs version TPU Function Set (3Sin3)
flag0 = 1
flag0 = 1
flag0 = 0
The bottom channel with longest momentary high-time is marked by a flag0 and
runs the HL_RLD and C1, C2, C3, C4, C5, C6 states.
The TPU cannot generate PWM signals with duty cycle ratios very close to 0%
or 100%. The minimum pulse width that the TPU can be guaranteed to
generate correctly is determined by the TPU function itself and by the activity
on the other channels. When the TPU function is requested to generate a
narrower pulse, a collision can occur. To prevent this, the parameter MPW
(minimum pulse width) is introduced. The TPU function 3Sin3 limits the
narrowest generated pulse widths to MPW. The CPU program should check,
and limit, the maximum amplitude of the Stator Reference Voltage Vector. The
maximum amplitude of the Stator Reference Voltage Vector should be less
than
If this is not the case, the TPU function will start to limit the minimum pulse
widths to MPW to prevent a collision, and the duty cycle ratio traces will be
deformed as shown on
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4. 3Sin3 state diagram
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HL_RLD
no reload
Figure
reload
C123456
1
5.
C23456
2
4-times
MPW
5-times
T
5
6
HL
th
th
-time
-time
LH_C7
Detailed Function Description
HSR = 11
STOP
AN2515/D
11