BA6444FP Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BA6444FP

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

FOperation notes

(1) Thermal shut down circuit

The BA6444FP has a thermal shutdown circuit to protect

the IC. The shutdown temperatures is 175_C (typical)

with a hysteresis width of 45_C (typical).

When the circuit is activated due to an increased in chip

temperature, the output pins (pins 5, 6 and 9) are set to

the open state. The circuit is functional against excessive

power dissipation, output short-circuiting, and other

irregularities in the output current, but does not work

against overheating caused by high internal currents due

to externally caused IC damage or pin-to-pin short-cir-

cuiting.

(2) The brake circuit has temperature-dependent

thresholds as shown in Fig. 16. Make sure that your ap-

plication will work properly when using the IC at low or

high temperatures.

(3) Be sure to connect the radiation fin to the ground.

BA6444FP

(4) Hall input

The Hall input circuit is described in (6) of “I / O equivalent

circuits.” Hall devices can be connected in either series

or parallel. Be sure to keep the Hall input within the range

of 1.5V to (VCC * 1.5V).

(5) FG amplifier

Note that unpredictable outputs may occur when the FG

amplifier input is outside the recommended range.

(6) ECGND pin (pin 4)

Pin 4, a torque amplifier ground pin, should be connected

to the ground. By connecting this pin to a point close to

the motor ground, you can prevent the effect of GND

common impedance on the current-sensing resistor

(0.5Ω recommended) connected between RNF (pin 7)

and the motor ground pin.

FElectrical characteristic curves

643

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