EUM6179/6179A
Thermal shut down (TSD)
Lock detection , automatic restart circuit
This IC is built-in TSD.
This IC detect the rotation of the motor by hall signal,
and adjust lock detection ON time (Ton) and lock
detection OFF time (Toff) by the internal counter.
These time (Ton, Toff) are showed below.
TSD has the temperature hysteresis.
Figure 6. TSD
TSD ON (TYP. :175℃) All output transistor OFF.
TSD OFF (TYP. :150℃) Reset ordinary motion.
(It has the temperature hysteresis of 25℃ <TYP>)
Figure 7. Lock detect and auto restart motion
*Motor does not restart while lock detection off time.
Output current
Reverse connection of power supply
Less than 4.0V, lomax is decreased as shown if Fig 8.
Please use it not to be over Pd.
Reverse connection of power supply may break the
device. A countermeasure is needed such as using
reverse current protection diode between power supply
and Vcc terminal.
Power supply line
The BEMF cause re-circulate current to power supply,
Please connect a capacitor between power supply and
GND as a route of re-circulate current. And please
determine the capacitance after confirmation that the
capacitance does not causes any problems.
Figure 8. Iomax
DS6179 Ver1.0 Feb. 2007
10
EUTECH [ EUTECH MICROELECTRONICS INC ]
