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DRV8812 Datasheet(PDF) 9 Page - Texas Instruments |
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DRV8812 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page DRV8812 www.ti.com SLVS997F – OCTOBER 2009 – REVISED AUGUST 2013 Decay Mode During PWM current chopping, the H-bridge is enabled to drive current through the motor winding until the PWM current chopping threshold is reached. This is shown in Figure 2 as case 1. The current flow direction shown indicates the state when the xENBL pin is high. Once the chopping current threshold is reached, the H-bridge can operate in two different states, fast decay or slow decay. In fast decay mode, once the PWM chopping current level has been reached, the H-bridge reverses state to allow winding current to flow in a reverse direction. As the winding current approaches zero, the bridge is disabled to prevent any reverse current flow. Fast decay mode is shown in Figure 2 as case 2. In slow decay mode, winding current is re-circulated by enabling both of the low-side FETs in the bridge. This is shown in Figure 2 as case 3. Figure 2. Decay Mode The DRV8812 supports fast decay, slow decay and a mixed decay mode. Slow, fast, or mixed decay mode is selected by the state of the DECAY pin - logic low selects slow decay, open selects mixed decay operation, and logic high sets fast decay mode. Note that the DECAY pin sets the decay mode for both H-bridges. Mixed decay mode begins as fast decay, but at a fixed period of time (75% of the PWM cycle) switches to slow decay mode for the remainder of the fixed PWM period. Blanking Time After the current is enabled in an H-bridge, 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. Note that the blanking time also sets the minimum on time of the PWM. nRESET and nSLEEP Operation The nRESET pin, when driven active low, resets the internal logic. It also disables the H-bridge drivers. All inputs are ignored while nRESET is active. Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: DRV8812 |
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