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DRV8889-Q1 Datasheet(PDF) 20 Page - Texas Instruments

Part No. DRV8889-Q1
Description  DRV8889-Q1, DRV8889A-Q1 Automotive Stepper Driver with Integrated Current Sense, 1/256 Micro-Stepping, and Stall Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DRV8889-Q1 Datasheet(HTML) 20 Page - Texas Instruments

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7.3.5 Current Regulation
The current through the motor windings is regulated by a PWM current-regulation circuit. When an H-bridge is
enabled, current rises through the winding at a rate dependent on the DC voltage, inductance of the winding,
and the magnitude of the back EMF present. When the current hits the current regulation threshold, the bridge
enters a decay mode for a period of time determined by the TOFF register setting and the selected decay mode
to decrease the current. After the off-time expires, the bridge is re-enabled, starting another PWM cycle.
Figure 7-5. Current Chopping Waveform
The PWM regulation current is set by a comparator which monitors the voltage across the current sense
MOSFETs in parallel with the low-side power MOSFETs. The current sense MOSFETs are biased with a
reference current that is the output of a current-mode sine-weighted DAC whose full-scale reference current is
set by the voltage at the VREF pin. In addition, the TRQ_DAC register can further scale the reference current.
Use Equation 1 to calculate the full-scale regulation current.
(1)
The TRQ_DAC is adjusted via the SPI register. Table 7-6 lists the current scalar value for different inputs.
Table 7-6. Torque DAC Settings
TRQ_DAC
CURRENT SCALAR (TRQ)
0000b
100%
0001b
93.75%
0010b
87.5%
0011b
81.25%
0100b
75%
0101b
68.75%
0110b
62.5
0111b
56.25%
1000b
50%
1001b
43.75%
1010b
37.5%
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
20
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Product Folder Links: DRV8889-Q1


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