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DRV8434SPWPR Datasheet(PDF) 13 Page - Texas Instruments |
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DRV8434SPWPR Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 73 page  Table 7-1. External Components COMPONENT PIN 1 PIN 2 RECOMMENDED CVM1 VM PGND Two X7R, 0.01-µF, VM-rated ceramic capacitors CVM2 VM PGND Bulk, VM-rated capacitor CVCP VCP VM X7R, 0.22-µF, 16-V ceramic capacitor CSW CPH CPL X7R, 0.022-µF, VM-rated ceramic capacitor CDVDD DVDD GND X7R, 0.47-µF to 1-µF, 6.3-V ceramic capacitor RnFAULT VCC (1) nFAULT >4.7-kΩ resistor RREF1 VREF VCC Resistor to limit chopping current. It is recommended that the value of parallel combination of RREF1 and RREF2 should be less than 50-kΩ. RREF2 (Optional) VREF GND (1) VCC is not a pin on the device, but a VCC supply voltage pullup is required for open-drain output nFAULT; nFAULT may be pulled up to DVDD. 7.3.1 Stepper Motor Driver Current Ratings Stepper motor drivers can be classified using three different numbers to describe the output current: peak, RMS, and full-scale. 7.3.1.1 Peak Current Rating The peak current in a stepper driver is limited by the overcurrent protection trip threshold IOCP. The peak current describes any transient duration current pulse, for example when charging capacitance, when the overall duty cycle is very low. In general the minimum value of IOCP specifies the peak current rating of the stepper motor driver. For the DRV8434S, the peak current rating is 4 A per bridge. 7.3.1.2 RMS Current Rating The RMS (average) current is determined by the thermal considerations of the IC. The RMS current is calculated based on the RDS(ON), rise and fall time, PWM frequency, device quiescent current, and package thermal performance in a typical system at 25°C. The actual operating RMS current may be higher or lower depending on heatsinking and ambient temperature. For the DRV8434S, the RMS current rating is 1.8 A per bridge. 7.3.1.3 Full-Scale Current Rating The full-scale current describes the top of the sinusoid current waveform while microstepping. Because the sinusoid amplitude is related to the RMS current, the full-scale current is also determined by the thermal considerations of the device. The full-scale current rating is approximately √2 × IRMS for a sinusoidal current waveform, and IRMS for a square wave current waveform (full step). AOUT Step Input BOUT Full-scale current RMS current Figure 7-1. Full-Scale and RMS Current www.ti.com DRV8434S SLOSE70 – DECEMBER 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 13 Product Folder Links: DRV8434S |
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