st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 245

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto
Figure 111. PWM application in voltage or current sensor mode (see
Deadtime generator
When using typical triple half bridge topology for power converters, precautions must be taken to avoid
short circuits in half bridges. This is ensured by driving high and low side switches with complementary
signals and by managing the time between the switching-off and the switching-on instants of the adjacent
switches.
This time is usually known as deadtime and has to be adjusted depending on the devices connected to
the PWM outputs and their characteristics (intrinsic delays of level-shifters, delays due to power switches,
etc.).
When driving motors in six-step mode, the deadtime generator function also allows synchronous
rectification to be performed on the switch adjacent to the one where PWM is applied to reduce
conduction losses.
For each of the three PWM channels, there is one 6-bit deadtime generator available.
It generates two output signals: A and B.
The A output signal is the same as the input phase signal except for the rising edge, which is delayed
relative to the input signal rising edge.
The B output signal is the opposite of the input phase signal except the rising edge which is delayed
relative to the input signal falling edge.
Figure 112
OS2
0
1
In sensor mode, there is no demagnetization event and the PWM behavior can be changed before and after Z event.
and before Z
High channels
Low channels
PWM behavior after C
0 x 0
0 x 1
1 x 0
1 x 1
shows the relationship between the output signals of the deadtime register and its inputs.
0
0
0
1
1
1
0
1
High
Low
Low
Low
xx
High
High
High
Low
1
0
-
Wait Z event
OS1
OS2
(sensor mode: SR = 1)
Not used
Step
OS0
Table
0
1
Delay
Delay
OS0
High channels
Low channels
and before next C
PWM behavior after Z
134)
On-chip peripherals
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