DRV8886ATPWPR IC

DRV8886ATPWPR Description

Applications for the DRV8886AT, a stepper motor driver, can be found in commercial and home appliances. The device incorporates a current sense amplifier, an indexer for micro-steps, and an H-bridge driver circuit using two N-channel power MOSFETs. The DRV8886AT can drive 1.4 A rms (at 24 V and TA = 25 °C) or 2 A full scale, depending on the PCB layout. To save PCB size and system cost, the DRV8886AT uses an internal current sense architecture, requiring only one external power sense resistor. The DRV8886AT has a smart tune adaptive decay technology, slow decay, and mixed decay selectable PWM current regulation technique.

Technology with “smart tune” adaptive decay automatically fine-tunes for the best current regulation performance, compensating for motor variance and the effects of age. The STEP/DIR interface allows an external controller to change the step rate and direction of the stepper motor. The gadget supports various step settings, from full to 1/16 micro step. The nSLEEP pin activates a low-power sleep mode that draws very little power while idle. There are safeguards built into the device to prevent damage from overheating, short-circuiting, excessive current, and overvoltage in the power supply. The nFAULT pin indicates fault states.

Detailed Description

The DRV8886AT is a complete motor-driver system for bipolar stepper motors. The device incorporates two H-bridges of N-channel power MOSFETs, current sensing and regulation circuitry, and an indexer for micro-stepping. The supply voltage for the DRV8886AT can range from 8 V to 37 V, and its maximum output currents are 3 A peak, 2 A whole scale, and 1.4 A root mean square (rms). Conditions such as temperature, supply voltage, and PCB thermal capabilities all play a role in determining the full-scale and rms current values that will be used in practice. To avoid using two additional external power sense resistors, the DRV8886AT gadget makes use of an integrated current-sensing architecture.

This design eliminates power loss in the sense resistors by employing a current mirror strategy and tapping into the built-in power MOSFETs for current sensing. A typical low-power resistor attached to the RREF pin can alter the current regulation set point. Due to this feature, the system’s price, the size of the board PCB, and the amount of power it uses are all reduced. A simple STEP/DIR interface lets an outside controller control the direction and step rate of a stepper motor.An external controller can control the stepper motor’s direction and step rate via a straightforward STEP/DIR interface. High-precision microstepping can be performed by the internal indexer without any intervention from the external controller. Full step, half step, and 1/4, 1/8, and 1/16 microstepping are all possible with this indexer. For greater torque output at higher motor RPM, a noncircular half-stepping mode is also provided in addition to the regular half-stepping mode.

Multiple decay modes are available for the modulation of the current. You can choose between a slow-mixed mode, a mixed decay mode, a smart-tune Ripple Control mode, or a smart-tune Dynamic Decay mode to control the current decay rate. In the slow-mixed decay mode, the steps increase slowly but change rapidly. Smart tune decay modes self-adjust for peak current regulation performance, compensating for motor variation and wear and tear. Clever track Ripple Control is a method of controlling the current through a motor that employs several steps to reduce winding current distortion as precisely as possible. Clever track to reduce distortion and frequency content in the motor winding current, dynamic decay (%) method The off-time in dynamic decay is fixed. The minimum drive time adjusts automatically based on the output current level, thanks to an adaptive blanking time function. Limiting the drive time at low-current steps is a great way to reduce zero-crossing distortion.

Thanks to the torque DAC function, the controller may grow the output current without scaling the RREF reference resistor. With the torque DAC function, the controller can increase the output current without changing the RREF reference resistor. The controller can access the torque DAC through a digital input pin to reduce motor current consumption and save system power when a high output torque is not required. A low-power sleep mode is integrated into the system to conserve energy when the motor is not in use.

Feature Description

specifications for the amperage output of stepper motor drivers There are three ways to talk about the current output of a stepper motor driver: peak, RMS, and full scale.

Peak Current Rating

An IOCP, or overcurrent protection trip threshold, controls the maximum allowable current in a stepper driver. While the overall duty cycle is very low, such as when charging capacitance, the current pulse has a concise duration described by the peak current. In most cases, the stepper motor driver’s maximum allowable peak current is determined by the minimum value of IOCP. The DRV8886AT chip has a maximum allowable current of 3 A per bridge at peak conditions.

RMS Current Rating

When designing an integrated circuit, thermal restrictions are factored into calculating the RMS (average) current. In a normal system operating at 25 degrees Celsius, the RMS current is established by the RDS(ON), the rise and fall timings, the PWM frequency, the quiescent current of the device, and the thermal performance of the package. In actual use, heatsinking and the surrounding temperature have the potential to either increase or decrease the required RMS current for operation. The RMS current that each bridge of a DRV8886AT device can carry is up to 1.4 A.

Linear Voltage Regulators

The DRV8886AT gadget has a linear voltage regulator incorporated within it for your convenience. The DVDD regulator can supply a voltage reference in certain circumstances. You might not have any problems using a ceramic capacitor to connect the DVDD pin straight to GND. The voltage that the DVDD produces is typically 3.3 V. The output voltage suffers a substantial drop whenever the current load on the DVDD LDO is greater than 1 mA.

Final thoughts

For the DRV8886AT device to work, it needs a range of input voltage supplies (VM) from 8 V to 37 V. At each VM pin, a ceramic capacitor rated for VM and with a capacity of 0.01 microfarads must be placed as close as possible to the DRV8886AT device. In addition to that, VM has to have a bulk capacitor installed.

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