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POWERSTEP01TR 数据表(PDF) 35 Page - STMicroelectronics |
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POWERSTEP01TR 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 92 page  DocID025022 Rev 5 35/92 powerSTEP01 Functional description 92 The gate current can be set to one of following values: 4, 8, 16, 24, 32, 64 and 96 mA through the IGATE parameter in the GATECFG1 register. Controlled current time can be programmed within range from 125 ns to 3.75 s with a resolution 125 ns (TCC parameter in GATECFG1 register). Turn-off overboost time can be set to one of following values: 0, 62.5, 125, 250 ns (TBOOST parameter in GATECFG1 register). The 62.5 ns value is only available when clock frequency is 16 MHz or 32 MHz; when clock frequency is 8 MHz it is changed to 125 ns and when a 24 MHz clock is used it is changed to 83.3 ns. 7.17 Deadtime and blanking time During the bridge commutation, a deadtime is added in order to avoid cross conductions. The deadtime can be programmed within a range from 125 ns to 4 s with a resolution of 125 ns (TDT parameter in the GATECFG2 register) (see Section 11.1.26 on page 64). At the end of each commutation the overcurrent and stall detection comparators are disabled (blanking) in order to avoid the respective systems detecting body diodes turn-off current peaks. The duration of blanking time is programmable through the TBLANK parameter in the GATECFG2 register at one of the following values: 125, 250, 375, 500, 625, 750, 875, 1000 ns (see Section 11.1.26). 7.18 Integrated analog-to-digital converter The powerSTEP01 integrates an NADC bit ramp-compare analog to digital converter with a reference voltage equal to VREG. The analog to digital converter input is available through the ADCIN pin and the conversion result is available in the ADC_OUT register (Section 11.1.20 on page 60). The ADC_OUT value can be used for motor supply voltage compensation or can be at the user’s disposal. Table 11. Output slew rate Slew rate (VS = 48 V) Igate tCC tDT tblank tboost 980 V/µs 96 mA 375 ns 125 ns 500 ns 0 ns 790 V/µs 64 mA 500 ns 125 ns 375 ns 0 ns 520 V/µs 32 mA 875 ns 125 ns 250 ns 0 ns 400 V/µs 24 mA 1000 ns 125 ns 250 ns 0 ns 220 V/µs 16 mA 1600 ns 125 ns 250 ns 0 ns 114 V/µs 8 mA 3125 ns 125 ns 250 ns 0 ns |
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