ST7MC1K2-Auto datasheet(245/371 Pages) STMICROELECTRONICS

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

0x 0

OS2

PWM behavior after C

High channels

Low channels

and before Z

OS1

Not used

OS0

PWM behavior after Z

High channels

Low channels

and before next C

OS2

OS0

Wait Z event

Delay

0x 1

1x0

1x1

High

Low

High

Low

High

Low

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)

ST7MC1K2-Auto bảng dữ liệu(PDF) 245 Page - STMicroelectronics

ST7MC1K2-Auto bảng dữ liệu(HTML) 245 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL