BA6840 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6840

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS

FCircuit operation

(1) Hall input X output

The 3-phase Hall signal is amplified in the hall amplifiers

and sent to the matrix section, where the signal is further

amplified and combined. After the signal is converted to

a current in the amplitude control circuit, the current is

supplied to the output driver, which then provides a motor

drive current. The phases of the Hall input signal, output

voltage, and output current are shown in Fig. 5.

(2) Torque control pin

The RNF-pin current depends on the torque control input

voltage (EC) as shown in Fig. 6.

(3) Start / stop pin

The motor is in the run mode when the pin input voltage

is 3.5V or more, and in the idle mode (all output transis-

tors are off) when the voltage is 1.5V or less.

(4) Power ground pin (RNF pin)

The RNF pin is the output stage ground pin. Connect a re-

sistor (0.5Ω recommended) between this pin and the

ground to monitor the output current.

(5) Phase compensation pin (CNF pin)

Connect and adjust a capacitor between this pin and the

ground if the output tends to oscillate.

527

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