BA6872AFM 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6872AFM

3-phase motor driver and reversible motor driver

ROHM Semiconductor 

Motor driver ICs

FCircuit operation

Capstan three-phase motor driver

(1) Pseudo-linear output

The IC generates a trapezoidal (pseudo-linear) output

current whose waveform phase is 30 degrees ahead of

that of the Hall input voltage.

BA6872AFM

(4) Motor direction control (ED / S pin)

The motor mode is forward when the ED / S is voltage is

less than 2.2V, and reverse when the ED / S is voltage is

greater than 2.8V.

(5) Output transistor saturation prevention circuit

This circuit monitors the output voltage and maintains the

operation of the output transistors below their saturation

levels. Operating the transistors in the linear characteris-

tic range provides good control over a wide current

range, and good torque characteristics even during over-

load.

(2) Torque control

The output current can be controlled by adjusting the

voltage applied to the torque control pins. The pins are

the inputs to a differential amplifier, and the reference

voltage side is biased with a voltage of 2.2V (Typ.).

(3) Output current sensing and torque limiting

ATC (pin 23) is the output stage ground. Connect a small

resistor (0.5Ω recommended) between this pin and the

GND pin, and feedback the voltage drop across this re-

sistor to the TL AMP input to detect the output cur-

rent.The output current can be limited by adjusting the

voltage applied to TL (pin 12). The current is limited when

pin 12 reaches the same potential as pin 23. The output

current under this condition is given by:

IMAX. =

VTL – (TL – ATC offset)

RATC

where RATC is the value of the resistor connected be-

tween the RATC pin and ground, and VTL is the voltage

applied to the TL pin.

827

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