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BA6840 Datenblatt(PDF) 5 Page - Rohm

Teilenummer BA6840
Bauteilbeschribung  3-phase motor driver
Download  9 Pages
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA6840 Datenblatt(HTML) 5 Page - Rohm

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Motor driver ICs
BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS
FCircuit operation
(1)
Hall input
Xoutput
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 (0.5
Ω 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.


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