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DRV8833RTYT Datasheet(PDF) 10 Page - Texas Instruments |
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DRV8833RTYT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page CHOP ISENSE 200 mV I R xOUT1 xOUT2 1 2 3 Forward drive Slow decay Fast decay VM 1 2 1 2 3 Reverse drive Slow decay Fast decay xOUT1 xOUT2 3 VM 1 2 3 FORWARD REVERSE DRV8833 SLVSAR1E – JANUARY 2011 – REVISED JULY 2015 www.ti.com Figure 6 shows the current paths in different drive and decay modes. Figure 6. Drive and Decay Modes 7.3.3 Current Control The current through the motor windings may be limited, or controlled, by a fixed-frequency PWM current regulation, or current chopping. For DC motors, current control is used to limit the start-up and stall current of the motor. For stepper motors, current control is often used at all times. When an H-bridge is enabled, current rises through the winding at a rate dependent on the DC voltage and inductance of the winding. If the current reaches the current chopping threshold, the bridge disables the current until the beginning of the next PWM cycle. Immediately after the current is enabled, the voltage on the xISEN pin is ignored for a fixed period of time before enabling the current sense circuitry. This blanking time is fixed at 3.75 μs. This blanking time also sets the minimum on time of the PWM when operating in current chopping mode. The PWM chopping current is set by a comparator which compares the voltage across a current sense resistor connected to the xISEN pins with a reference voltage. The reference voltage is fixed at 200 mV. The chopping current is calculated in Equation 1. (1) Example: If a 1- Ω sense resistor is used, the chopping current will be 200 mV/1 Ω = 200 mA. Once the chopping current threshold is reached, the H-bridge switches to slow decay mode. Winding current is recirculated by enabling both of the low-side FETs in the bridge. This state is held until the beginning of the next fixed-frequency PWM cycle. If current control is not needed, the xISEN pins should be connected directly to ground. 10 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: DRV8833 |
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