TA84002F 查看數據表（PDF） - Toshiba

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TA84002F

PWM CHOPPER TYPE 2−PHASE BIPOLAR STEPPING MOTOR DRIVER

Toshiba 

TA84002F

PWM CURRENT CONTROL

Output current is sensed and cotrolled independently in each bridge by an external sense resistor (RFN), internal

comparator, and mono−stable multi−vibrator.

When the bridge is turn ON, current increases in the motor winding and flows through the external sense resistor

until the sense voltage (VNF) reaches the level set at the comparator’ s input: Vref / 5

The comparator then triggers the mono−stable, which turn OFF the lower transistor of the bridge.

The OFF time is determined by the mono−stable’ s external RC timing components.

tOFF ≈ 1.1 CR

The value of the current limiting (IO) is approximated by

IO = (Vref / 5) / RNF−0.05

4

2001-09-06

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