The A3982 is a complete stepper motor drive with a built-in converter for easy operation. It operates bipolar stepper motors in full and half stepper modes with output drive performance up to 35 V and ±2 A. The A3982 includes a fixed shutdown time current regulator that operates in slow or mixed attenuation mode.
The converter is key to the ease of implementation of the A3982. Just enter a pulse in the Step input to drive the motor to produce a step. There are no phase sequence tables, high-frequency control lines, or complex interfaces in the program. The A3982 interface is ideal for applications where complex microprocessors are unavailable or overloaded.
The chopper control within the A3982 automatically selects the current decay mode (slow or mixed). When a signal appears at the Step input pin, the A3982 determines whether the step will generate a higher or lower current in each motor phase. If the charge is producing a higher current, set this decay mode to "Slow" attenuation. If the charge produces a lower current, the current decay is set to mixed (31.25% of the fixed downtime for the start pair of cycles is set to fast decay, then the cut-off remaining period is set to slow decay. This current degradation control scheme reduces audible motor noise, increases step accuracy, and reduces power dissipation.
An internal synchronous rectification control circuit is used to improve power consumption during pulse-width modulation (PWM) operation.
Internal circuit protection includes thermal shutdown due to hysteresis, undervoltage lockout (UVLO), and crossover current protection. No special power-up sequencing is required.
The A3982 is available in a 24-pin wide-body SOIC (package LB) package with an internal fuse for the power supply ground pin. They are all lead-free and 100% matte tin plated.
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低 RDS(开) 输出
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自动检测/选择电流衰减模式
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混合与慢电流衰减模式
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对低功率耗散同步整流
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内部欠压锁定 (UVLO) 及过热关机电路
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交叉电流保护