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数据搜索系统，热门电子元器件搜索 |
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ST7MC1K2 数据表(PDF) 245 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 245 Page - STMicroelectronics |
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245 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 245/371 Figure 111. PWM application in voltage or current sensor mode (see Table 134) 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 shows the relationship between the output signals of the deadtime register and its inputs. (sensor mode: SR = 1) Step xx 0x 0 1 0 - OS2 PWM behavior after C 0 1 High channels Low channels and before Z OS1 Not used OS0 PWM behavior after Z 0 1 High channels Low channels and before next C OS2 OS0 Wait Z event Delay Delay 0x 1 1x0 1x1 0 1 High Low 0 1 High Low 0 1 High Low 0 1 High Low In sensor mode, there is no demagnetization event and the PWM behavior can be changed before and after Z event. Obsolete Product(s) - Obsolete Product(s) |
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