402

Motor driver ICs

BA6219B / BA6219BFP-Y

FOperation notes

(1)

A schematic for the internal circuit associated with

the output voltage setting pin (Pin 4) is shown in Fig. 7.

and the pin 4 voltage is given by :

(Q3)

Though

(2)

Thermal shutdown circuit

The thermal shutdown circuit turns off the driver output

if the chip temperature rises to about 180

_. The shut-

down signal is not latched.

(3)

Power supply impedance

When the motor stops or starts, a rush current flows in the

VCC and GND lines. Depending on the way of connect-

ing a power supply decoupling capacitor (100

µF), the

control input voltage may become a negative value or the

supply voltage may drop to below the output voltage.

This can cause erratic operations due to parasitic effects.

Make sure that pin voltages will not exceed the supply

voltage by more than 0.3V or will not become less than

the GND pin voltage by more than 0.3V.

(4)

VCC1, VCC2, and VR are related to each other as

shown in the output circuit diagram of Fig. 8. Their values

should be kept within the following ranges.

Operating supply voltage ranges

* 2.5V

* 1V

(5)

Input circuit