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DRV8800RTYT Datasheet(PDF) 10 Page - Texas Instruments |
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DRV8800RTYT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page tOCP tBLANK IPEAK IOCP IOUTx High-Z VOUTA VOUTB Enable, Source orSink BLANK ChargePump Counter NFAULT MotorLead ShortCondition NormalDC MotorCapacitance FUNCTIONAL DESCRIPTION Device Operation Logic Inputs VREG (DRV8800 Only) VPROPI (DRV8801 Only) DRV8800 DRV8801 SLVS855A – JULY 2008 – REVISED JULY 2008 ............................................................................................................................................................... www.ti.com Figure 2. Overcurrent Control Timing The DRV8800/DRV8801 is designed to drive one dc motor. The current through the output full-bridge switches and all N-channel DMOS are regulated with a fixed off-time PWM control circuit. It is recommended to use a high-value pullup resistor when logic inputs are pulled up to VDD. This resistor limits the current to the input in case an overvoltage event occurs. Logic inputs are nSLEEP, MODE, PHASE, and ENABLE. Voltages higher than 7 V on any logic input can cause damage to the input structure. This output represents a measurement of the internal regulator voltage. This pin should be left disconnected. A voltage of approximately 7.5 V can be measured at this pin. This output offers an analog voltage proportional to the winding current. Voltage at this terminal is five times greater than the motor winding current (VPROPI = 5×I). VPROPI is meaningful only if there is a resistor connected to the SENSE pin. If SENSE is connected to ground, VPROPI measures 0 V. During slow decay, VPROPI outputs 0 V. VPROPI can output a maximum of 2.5 V, since at 500 mV on SENSE, the H-bridge is disabled. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): DRV8800 DRV8801 |
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