ZHCSEP5D January 2016 – November 2018 DRV8884
PRODUCTION DATA.
After the current is enabled in an H-bridge, the current sense comparator is ignored for a period of time (tBLANK) before enabling the current sense circuitry. Note that the blanking time also sets the minimum drive time of the PWM. Table 7 shows the blanking time based on the sine table index and the torque DAC setting. Note that the torque DAC index is not the same as one step as given in Table 3.
tblank = 1.5 µs | tblank = 1.0 µs |
SINE INDEX | TORQUE DAC (TRQ) | ||
---|---|---|---|
100% | 75% | 50% | |
16 | 100% | 75% | 50% |
15 | 98% | 73.5 | 49% |
14 | 96% | 72% | 48% |
13 | 92% | 69% | 46% |
12 | 88% | 66% | 44% |
11 | 83% | 62.3% | 41.5% |
10 | 77% | 57.8% | 38.5% |
9 | 71% | 53.3% | 35.5% |
8 | 63% | 47.3% | 31.5% |
7 | 56% | 42% | 28% |
6 | 47% | 35.3 | 23.5% |
5 | 38% | 28.5 | 19% |
4 | 29% | 21.8% | 14.5% |
3 | 20% | 15% | 10% |
2 | 10% | 7.5% | 5% |
1 | 0% | 0% | 0% |