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DMOS Microstepping. Driver with Translator And Overcurrent Protection

The HR4982 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-,1/8-, 1/16- and 1/128- step modes, with an output drive capacity of up to 35 V and ±2 A. The HR4982 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.

The translator is the key to the easy implementation of the HR4982. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The HR4982 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

During stepping operation, the chopping control in the HR4982 automatically selects the current decay mode, Slow or Mixed. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power-on sequencing is not required.

The HR4982 is supplied in a low-profile (height≤1.20mm),

28-pin TSSOP with exposed thermal pad. It is lead (Pb) free (suffix –T), with 100% matte tin plated leadframes.


Features and Benefits

Low RDS(ON) outputs

Automatic current decay mode detection/selection

Mixed and Slow current decay modes

Synchronous rectification for low power dissipation

Internal UVLO

Crossover-current protection

3.3 and 5 V compatible logic supply

Thermal shutdown circuitry

Short-to-ground protection

Shorted load protection

Four selectable step modes: full, 1/8, 1/16, and 1/128