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DRV8818PWP Datasheet(PDF) 9 Page - Texas Instruments |
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DRV8818PWP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page xOUT1 xOUT2 3 1 2 3 Drive current Slow decay (brake) Fast decay (reverse) VM 1 2 0.6 CC FD DECAY V t R C In V æ ö · = · · ç ÷ è ø DRV8818 www.ti.com SLVSAX9A – SEPTEMBER 2011 – REVISED FEBRUARY 2012 Figure 2. Decay Mode The DRV8818 also supports a mixed decay mode. Mixed decay mode begins as fast decay, but after a period of time switches to slow decay mode for the remainder of the fixed off time. Fast and mixed decay modes are only active if the current through the winding is decreasing; if the current is increasing, then slow decay is always used. Which decay mode is used is selected by the voltage on the DECAY pin. If the voltage is greater than 0.6 x VCC, slow decay mode is always used. If DECAY is less than 0.21 x VCC, the device operates in fast decay mode when the current through the winding is decreasing. If the voltage is between these levels, mixed decay mode is enabled. In mixed decay mode, the voltage on the DECAY pin sets the point in the cycle that the change to slow decay mode occurs. This time can be approximated by: (4) Mixed decay mode is only used while the current though the winding is decreasing; slow decay is used while the current is increasing. Operation of the blanking, fixed off time, and mixed decay mode is illustrated in Figure 3. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): DRV8818 |
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