BA6458FP-Y Datasheet, PDF (6/8 Pages) Rohm – 3-phase motor driver

Motor driver ICs
(7) I / O of hysteresis amplifiers
BA6458FP-Y
∗ Note that resistance values of the I / O circuits can vary
± 30%
(2) Torque control
The RNF-pin output voltage is plotted against the torque
control input voltage (EC) in Fig. 10.
(3) Start / stop pin
The I / O equivalent circuit of the start / stop pin is shown
in (1). 1) of “Precautions for use.” The pin has a tempera-
ture dependence of *7mV / _C, and the resistance can
vary ±30%. Take the temperature effect into consider-
ation when designing your application.
(4) Hall input
The I / O equivalent circuit of the Hall input pins is shown
in (1). 5) of “Precautions for use.” The Hall devices can
be connected in either series or parallel.
(5) Torque limit pin (pin 18)
The output current can be limited by applying a voltage
to the torque limit pin. Control is provided so that this pin
will have the same potential as the power ground pin.
Note that there is a voltage offset on this pin. The RNF-pin
voltage is 0.325V when the TL-pin voltage is 0.4V (typi-
cal) and the RNF-pin resistance is 0.5Ω. Note that the volt-
age offset changes with the RNF-pin resistance.
(6) Amplifiers 1 and 2
Unpredictable outputs may occur when the amplifier in-
put is outside the recommended range.
(7) Hysteresis amplifier
An input range of 0.6V to (VCC X 1.2V) is recommended.
Unpredictable outputs may occur when the input is out-
side this range.
(8) Thermal shutdown circuit (TSD)
The circuit puts the driver outputs (A1, A2, and A3) to the
open state at the temperature of 175_C (typical). There
is a temperature difference of about 20_C between the
temperatures at which the circuit is activated and deacti-
vated.
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