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DRV8870DDA Datasheet(PDF) 9 Page - Texas Instruments |
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DRV8870DDA Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 25 page  IN1 IN2 OUT1 tDEAD tPD tR tDEAD tF tPD OUT2 tDEAD tPD tF tDEAD tR tPD ITRIP tOFF tBLANK tDRIVE TRIP v ISEN ISEN VREF (V) VREF (V) I (A) A R ( ) 10 R ( ) u : u : 9 DRV8870 www.ti.com SLVSCY8A – AUGUST 2015 – REVISED JANUARY 2016 Product Folder Links: DRV8870 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated (1) For example, if VREF = 3.3 V and a RISEN = 0.15 Ω, the DRV8870 will limit motor current to 2.2 A no matter how much load torque is applied. For guidelines on selecting a sense resistor, see Sense Resistor. When ITRIP has been reached, the device enforces slow current decay by enabling both low-side FETs, and it does this for time tOFF (typically 25 µs). Figure 5. Current Regulation Time Periods After tOFF has elapsed, the output is re-enabled according to the two inputs INx. The drive time (tDRIVE) until reaching another ITRIP event heavily depends on the VM voltage, the motor’s back-EMF, and the motor’s inductance. 7.3.4 Dead Time When an output changes from driving high to driving low, or driving low to driving high, dead time is automatically inserted to prevent shoot-through. tDEAD is the time in the middle when the output is High-Z. If the output pin is measured during tDEAD, the voltage will depend on the direction of current. If current is leaving the pin, the voltage will be a diode drop below ground. If current is entering the pin, the voltage will be a diode drop above VM. This diode is the body diode of the high-side or low-side FET. Figure 6. Propagation Delay Time |
Similar Part No. - DRV8870DDA |
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Similar Description - DRV8870DDA |
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